n.runs-SA-2007.027 - Sophos Antivirus UPX parsing Arbitrary CodeExecution Advisory

n.runs AG

http://www.nruns.com/			              security(at)nruns.com
n.runs-SA-2007.027                                           24-Aug-2007

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Vendor:	               Sophos, 
http://www.sophos.com
Affected Products:      

Vulnerability:         Arbitrary Code Execution (remote) 
Risk:                  HIGH

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Vendor communication:

  2007/05/07		initial notification to Sophos
  2007/05/09		Sophos Response
  2007/05/14		PGP public keys exchange
  2007/05/14		PoC files sent to Sophos
  2007/05/17		Sophos acknowledged the PoC files
  2007/05/17		Sophos Corporation validate the Vulnerability
  2007/05/17		Sophos notify tentative update release date
  2007/07/31		Sophos notify a delay in the update release date
  2007/08/23		Sophos Update with fixes released

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Overview:  

Sophos is a world leader in IT security and control solutions purpose-built for business, education, government organizations and service providers. Their reliably engineered, easy-to-operate products protect over 100 million users in more than 150 countries from viruses, spyware, adware, Trojans, intrusion, spam, policy abuse, and uncontrolled network access.

Description:

A remotely exploitable vulnerability has been found in the file parsing engine.

In detail, the following flaw was determined:

• Infinite Loop in UPX packed files parsing

Impact:

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This problem can lead to remote denial of service or arbitrary code execution if an attacker carefully crafts a file that exploits the aforementioned vulnerability. The vulnerability is present in Sophos Anti-virus software listed above on all platforms supported by the affected products prior to the engine Version 2.48.0.

Solution:
The vulnerability was reported on 07.May.2007 and an update has been issued on 23.Aug.2007 to solve this vulnerability. For detailed information about the fixes follow the link in the References [1] section of this document. n.runs AG wants to highlight the excellent and fluent communication with Sophos.

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

References:
http://www.sophos.com/support/knowledgebase/article/28407.html [1]

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Copyright 2007 n.runs AG. All rights reserved. Terms of use apply. Received on Sat Aug 25 12:23:58 2007