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Sophos Anti-Virus Zip Archive Virus Detection Bypass
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Secunia Advisory:
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SA12875
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Release Date:
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2004-10-20
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Popularity:
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7,489 views
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Critical:
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Not critical
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Impact:
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Security Bypass
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Where:
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From remote
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Solution Status:
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Partial Fix
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| Software: | Sophos Anti-Virus 3.x
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Subscribe:
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Instant alerts on relevant vulnerabilities 
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| | CVE reference: | CVE-2004-0937
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Description:
A weakness has been reported in Sophos Anti-Virus, which can be exploited by malware to bypass certain scanning functionality.
The problem is caused due to an error when parsing .zip archive headers and can be exploited via a specially crafted .zip archive where the uncompressed size of the archived file has been modified within the local and global headers.
Successful exploitation causes malware in a specially crafted .zip archive to pass the scanning functionality undetected.
NOTE: This is not a critical issue on client systems, as the malware still is detected upon execution by the desktop on-access scanner.
Solution:
The problem has been fixed in version 3.87.0 of Sophos Anti-Virus on all operating system platforms except Windows 95/98/Me.
Sophos Anti-Virus for Windows 95/98/Me will be updated with the fix from version 3.88.0 (available from 24 November 2004).
Filter all compressed file archives (.zip) at border gateways.
Provided and/or discovered by:
Discovered by anonymous person and reported via iDEFENSE.
Original Advisory:
Sophos:
http://sophos.com/support/knowledgebase/article/2074.html
iDEFENSE:
http://www.idefense.com/application/poi/display?id=153&type=vulnerabilities
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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