n.runs-SA-2007.026 Sophos Antivirus BZip parsing Infinite Loop Advisory n.runs AG
http://www.nruns.com
n.runs-SA-2007.026
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: Infinite Loop DoS (remote)
Risk: MEDIUM
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 released Update with fixes
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 GZip file parsing
Impact: This problem can lead to a remote Denial of Service (DoS) situation through high CPU consumption and exhaustion of storage resources if an attacker carefully crafts a file that exploits the aforementioned vulnerability. The vulnerability is present in Sophos Anti-virus software mentioned 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. For all other reproduction or publication, in printing or otherwise, contact security@nruns.com for permission. Use of the advisory constitutes acceptance for use in an "as is" condition. 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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