Operating System:

[Win]

Published:

21 September 2007

Protect yourself against future threats.

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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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