21 September 2007
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2007.0715 -- [Win] Multiple vendors affected by Microsoft Foundation Class library FindFile() buffer overflow 21 September 2007 =========================================================================== 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. - --------------------------BEGIN INCLUDED TEXT-------------------- 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 - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: firstname.lastname@example.org Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBRvMSrSh9+71yA2DNAQLOGAP+JAIin5/pPci5b2XegWsyf12tccGZl1ZV ACbdAqjufx96tvoglyz2b8oIszxrZ40E4RcLZiXXv66Z1eEi1KXVnxHmn39GQZq9 NzthKXW1/Wt5/dRcKfaVUpKk36rwQgzP5bGMJ8EEeitys1h4Qk2SIX4+re+8xX2M Cv4V0rfNTrQ= =8JpJ -----END PGP SIGNATURE-----