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AUSCERT External Security Bulletin Redistribution
ESB-2007.0715 -- [Win]
Multiple vendors affected by Microsoft Foundation Class
library FindFile() buffer overflow
21 September 2007
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Foundation Class Library (MFC) 7.1 and 4.2
Third party products based on MFC Library
Publisher: US-CERT
Operating System: Windows
Impact: Execute Arbitrary Code/Commands
Access: Remote/Unauthenticated
CVE Names: CVE-2007-4916
Original Bulletin: http://www.kb.cert.org/vuls/id/611008
Comment: The vulnerable components are standard Microsoft libraries used in
Windows software development. Therefore it is expected that products
from many vendors will be vulnerable, if they use the FindFile()
function with untrusted data.
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US-CERT Vulnerability Note VU#611008
Microsoft MFC FindFile function heap buffer overflow
Overview
A buffer overflow vulnerability in the Microsoft Foundation Class
(MFC) Library could allow an attacker to execute arbitrary code on
an affected system.
I. Description
The Microsoft Foundation Class (MFC) Library is a Microsoft library
that wraps parts of the Windows API in C++ classes. The MFC libraries
contain a function called FindFile(). The FindFile() function manages
file searches across a filesystem, enabling users to specify the type
of file to search.
MFC is included in Microsoft Visual Studio and Microsoft Windows. MFC
is also used in Hewlett-Packard All-in-One and in Hewlett-Packard
Photo and Imaging Gallery. Note, however, that the use of MFC library
is not necessarily limited to these applications; other applications
may also be using the vulnerable libraries. Additionally, the list
of vendors under the "Systems Affected" section of this vulnerability
may not be an exhaustive list.
The MFC42 and MFC71 libraries contain a heap-based buffer overflow
vulnerability in the FindFile() function's argument handling. This
vulnerability could allow an attacker to execute arbitrary code or
cause a denial of service.
II. Impact
An attacker may be able to execute arbitrary code in the context of
an application that uses the vulnerable function. The scope of the
impact depends on how the affected application works. Applications
that process filename input from the network, such as some web
applications, would be vulnerable to a remote attacker. Applications
that only process filename input from a local user would only be
vulnerable to a local attacker.
Note that applications may be linking to the MFC library dynamically
or statically. It will be necessary to recompile any applications
that are statically linked to the MFC library.
III. Solution
We are currently unaware of a practical solution to this problem.
Note, however, that the MFC libraries can be used by multiple
applications on most systems. Once a solution is made available by
the vendor, it may be necessary for application users (system
administrators, developers) to upgrade or apply multiple patches and
then recompile statically linked applications.
Applications that are statically linked must be recompiled using
patched libraries. Applications that are dynamically linked do not
need to be recompiled; however, running services need to be restarted
in order to use the patched libraries.
System administrators should consider the following process when
addressing this issue:
1. Patch or obtain updated MFC libraries.
2. Restart any dynamically linked services that make use of the
MFC libraries.
3. Recompile any statically linked applications using the patched
or updated MFC libraries.
Note this is an iterative process for each set of patches being applied.
Systems Affected
Vendor Status Date Updated
Hewlett-Packard Company Vulnerable 19-Sep-2007
Microsoft Corporation Vulnerable 19-Sep-2007
References
http://goodfellas.shellcode.com.ar/own/VULWKU200706142
http://secunia.com/advisories/26800/
Credit
This vulnerability was reported by Jonathan Sarba of GoodFellas
Security Research Team.
This document was written by Joseph Pruszynski.
Other Information
Date Public 09/14/2007
Date First Published 09/20/2007 08:17:28 AM
Date Last Updated 09/20/2007
CERT Advisory
CVE Name CVE-2007-4916
Metric 12.93
Document Revision 31
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