n.runs-SA-2007.027 Sophos Antivirus UPX parsing Code execution
n.runs AG
http://www.nruns.com
n.runs-SA-2007.027
security(at)nruns.com
24-Aug-2007
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Vendor: Sophos, http://www.sophos.com
Affected Product:
Sophos Anti-Virus for Windows
Sophos Anti-Virus for Unix/Linux < 2.48.0
Vulnerability: Arbitrary Code Execution (remote)
Risk: HIGH
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
2007/08/29 Sophos contacts n.runs AG to discuss Exploitability
2007/09/03 Sophos updates the advisory
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:
- One BYTE Overwrite in Arbritary Location caused by an Integer Handling
issue while parsing the UPX format.
Impact:
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.
Unaltered electronic reproduction of this advisory is permitted.
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All warranties are excluded. In no event shall n.runs be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if n.runs has been advised of the possibility of such damages.
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