Name                Cross Site Scripting Vulnerability in Sophos Anti-Virus 
Systems Affected    Sophos Anti-Virus, version 6.5.4 R2
Severity            Medium
Category            Cross Site Scripting
Author              Context Information Security Ltd
Advisory            6th September 2007


Description
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A ZIP archive containing a virus signature with a malformed file name will cause a Cross Site Scripting vulnerability to be triggered from within the Sophos Anti Virus client.


Analysis
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When Sophos anti-virus scans a specially crafted ZIP archive containing a XSS attack string, it will internally log the string.  When this information is accessed via the Sophos client (SavMain.exe) the XSS attack string is unencoded.  When the print function is called, the application can be used to run arbitrary code on the target machine from an external attacker’s submitted file.

  
Technologies Affected
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Sophos Anti-Virus, version 6.5.4 R2


Resolution
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Update to version 6.5.8 or 7.0.


Vendor Response
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Sophos have patched this issue in version 7.01.


CVE Details
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This issue has been provisionally assigned a CVE candidate number of CVE-2007-4512


Disclosure Timeline
-------------------
18 April 2007    – Initial Discovery and vendor notification
19 April 2007    – Vendor Response
21 August 2007   – Second Vendor Response
6 September 2007 - Coordinated Public Release


Credits
--------
Michael Jordon of Context Information Security Ltd


About Context Information Security
----------------------------------

Context Information Security Limited is a specialist information security consultancy based in London and Frankfurt. Context promotes the holistic approach to information security and helps clients to identify, assess and control their exposure to risk within the fields of IT, telephony and physical security. Context employs experienced information security professionals who are subject-matter experts in their various technical specialisms.  Context works extensively within the finance, legal, defence and government sectors, delivering high-end information security projects to organisations for which security is a priority.

Web:    www.contextis.co.uk
Email:   disclosure@contextis.co.uk


About Sophos
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"Sophos is a world leader in IT security and control solutions purpose-built for business, education, government organizations and service providers. Our 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."