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avast! Anti-Virus Engine Malformed ZIP/CAB Archive Virus Detection Bypass
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Secunia Advisory:
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SA17126
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Release Date:
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2005-10-13
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Popularity:
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11,597 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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Unpatched
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| Software: | avast! for Kerio 4.x
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Secunia CVSS-2 Score:
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Available in Secunia business solutions 
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| Advisory Content (Page 1 of 3) | [ 1 ] [ 2 ] [ 3 ] | |
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Description:
fRoGGz has discovered a weakness in avast! Anti-Virus scan engine, which can be exploited by malware to bypass certain scanning functionality.
The weakness is caused due to an error in parsing certain malformed archives and can be exploited via a specially crafted archive with additional characters prepended to the header. Such malformed archives can be correctly extracted by some archiving software.
Successful exploitation allows malware packed in malformed archives to pass the email anti-virus scanning gateway undetected.
The weakness has been confirmed in avast! for Kerio version 4.6.313 (Vps 0541-1) when scanning an email containing malformed ".zip" and ".cab" archives. Other versions may also be affected.
NOTE: This is not an issue on client systems, as the malware is still detected upon execution by the desktop on-access scanner.
Change Page:
[ 1 ] [ 2 ] [ 3 ]
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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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