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Sophos Anti-Virus ZIP Archive Denial of Service Vulnerability
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Secunia Advisory:
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SA16082
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Release Date:
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2005-07-15
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Popularity:
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7,807 views
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Critical:
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Moderately critical
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Impact:
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DoS
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | Sophos Anti-Virus 3.x
Sophos Anti-Virus 4.x
Sophos Anti-Virus 5.x
Sophos MailMonitor for SMTP
Sophos PureMessage for UNIX 4.x
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| CVE reference: | CVE-2005-1530
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Description:
A vulnerability has been reported in Sophos Anti-Virus, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to missing validation checks on the "Extra field length" value when scanning a ZIP archive compressed using the BZIP2 algorithm. This can be exploited to cause an infinite loop that consumes large amount of CPU resources via a malicious ZIP file with an extra field length value of "0xFFFF".
Successful exploitation prevents further scanning, but requires the non-default "Scan inside archive files" setting to be enabled.
The vulnerability has been reported in versions 3.91, 3.90, and 5.0.1. Other versions may also be affected.
Solution:
Update to latest versions using automatic update.
The problem has reportedly been fixed in the following versions:
* Version 3.95.0 of Sophos Anti-Virus (all platforms)
* Version 5.0.4 of Sophos Anti-Virus (Windows 2000/XP/2003)
* Version 4.5.3 of Sophos Anti-Virus (Windows NT and Windows 95/98/Me)
* Latest updated versions of PureMessage for UNIX, Windows/Exchange and MailMonitor.
Provided and/or discovered by:
Discovered by anonymous person and reported via iDEFENSE.
Original Advisory:
iDEFENSE:
http://www.idefense.com/application/poi/display?id=283&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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