bugtraq - [EEYEB-20050329] Windows Metafile Multiple Heap Overflows

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Message-ID: <D52FCFAE57472647956CBAEDC08DA5535C88C4@av-mail01.corp.int-eeye.com>
Date: Tue, 8 Nov 2005 11:39:44 -0800
From: <Advisories@...e.com>
To: <bugtraq@...urityfocus.com>, <vulnwatch@...nwatch.org>,
	<ntbugtraq@...bugtraq.com>, <full-disclosure@...ts.grok.org.uk>
Subject: [EEYEB-20050329] Windows Metafile Multiple Heap
	Overflows

Windows Metafile Multiple Heap Overflows

Release Date:
November 8, 2005

Date Reported:
March 29, 2005

Severity:
High (Code Execution)

Vendor:
Microsoft

Systems Affected:
Windows 2000
Windows Server 2003

Overview:
eEye Digital Security has discovered a heap overflow vulnerability in
the way the Windows Graphical Device Interface (GDI) processes Windows
enhanced metafile images (file extensions EMF and WMF).  An attacker
could send a malicious metafile to a victim of his choice over any of a
variety of media -- such as HTML e-mail, a link to a web page, a
metafile-bearing Microsoft Office document, or a chat message -- in
order to execute code on that user's system at the user's privilege
level.

Technical Details:
The Windows metafile rendering code in GDI32.DLL contains a number of
integer overflow flaws in its processing of EMF/WMF file data that lead
to exploitable heap overflows through any number of specially crafted
metafile structures.  For example, the following disassembly from
MRBP16::bCheckRecord demonstrates a size calculation that is susceptible
to integer overflow and as a result may pass validation with a dangerous
value:

    77F6C759    mov     edx, [ecx+18h]    ; malicious count (e.g.,
8000000Dh)
    77F6C75C    mov     eax, [ecx+4]      ; heap allocation size
     ...
    77F6C764    lea     edx, [edx*4+1Ch]  ; EDX >= 3FFFFFF9h: integer
overflow
    77F6C76B    cmp     edx, eax          ; validation check
    77F6C76D    jnz     77F6C77F

Protection:
Retina Network Security Scanner has been updated to identify this
vulnerability.
Blink Endpoint Protection proactively protects users from this
vulnerability.

Vendor Status:
Microsoft has released a patch for this vulnerability. The patch is
available at:
http://www.microsoft.com/technet/security/bulletin/MS05-053.mspx

Credit:
Fang Xing

Related Links:
This vulnerability has been assigned the following IDs;

EEYEB-20050329
OSVDB ID: 18820
CVE ID: CAN-2005-2124

Greetings:
Thanks Derek and and eEye guys help me wrote this advisory. Greeting
xfocus guys and venustech lab guys.

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Disclaimer
The information within this paper may change without notice. Use of this
information constitutes acceptance for use in an AS IS condition. There
are no warranties, implied or express, with regard to this information.
In no event shall the author be liable for any direct or indirect
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