[Full-disclosure] AVG Anti-Virus - Arbitrary Code Execution (remote)

n.runs AG
http://www.nruns.com/ security at nruns.com
n.runs-SA-2006.002 13-Nov-2006

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Vendor: Grisoft Inc., http://grisoft.com
Product: AVG Anti-Virus
Vulnerability: Arbitrary Code Execution (remote)

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Vendor communication:

2006/08/24 initial notification to Grisoft Inc.
2006/08/24 Grisoft Inc. Response
2006/08/25 PGP keys exchange
2006/08/25 PoC files sent to Grisoft Inc.
2006/08/30 Bugs Confirmation, Timeframe Coordination for patchs
development and testing
2006/09/20 Grisoft Inc. released Update with fixes

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Overview:

Grisoft is focused on developing software solutions that provide protection
from computer viruses. Grisoft's primary focus is to deliver the most
comprehensive and proactive protection available on the market.

Distributed globally through resellers and through the internet, the AVG
Anti-Virus product line supports all major operating systems and platforms.
More than 40 million users around the world use Grisoft AVG products to
protect their computers and networks.

Description:

Multiple vulnerabilities have been found in the file parsing engine.

In detail, the following flaws were determined:

• Heap Overflow through Integer Overflow in .CAB file parsing
• Uninitialized Variable flaw in .CAB file parsing.
• Divide by Zero in .DOC file parsing.
• Heap Overflow through Integer Overflow in .RAR file parsing
• Integer Issues in .EXE file parsing.

These problems can lead to remote arbitrary code execution if an attacker
carefully crafts a file that exploits one or more of the aforementioned
vulnerabilities. The vulnerabilities are present in AVG Antivirus software
versions prior to 7.1.407.

Solution:
The vulnerabilities were reported on Aug 24 and the fixes were released on
Sep 20. The updated software versions are available from
http://www.grisoft.com/doc/10/lng/us/tpl/tpl01

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Credit:
Bugs found by Sergio Alvarez of n.runs AG. Thanks.

Thanks.

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References: http://www.grisoft.com/doc/36365/lng/us/tpl/tpl01

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