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Secunia Security Advisory 17126

Secunia Security Advisory 17126
Posted Oct 13, 2005
Authored by Secunia | Site secunia.com

Secunia Security Advisory - fRoGGz has discovered a weakness in avast! Anti-Virus scan engine, which can be exploited by malware to bypass certain scanning functionality.

tags | advisory, virus
SHA-256 | 460976a67a7b81645036b98c04414d3fd891608f6ac0486c373864503eaa797b

Secunia Security Advisory 17126

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TITLE:
avast! Anti-Virus Engine Malformed ZIP/CAB Archive Virus Detection
Bypass

SECUNIA ADVISORY ID:
SA17126

VERIFY ADVISORY:
http://secunia.com/advisories/17126/

CRITICAL:
Not critical

IMPACT:
Security Bypass

WHERE:
>From remote

SOFTWARE:
avast! for Kerio 4.x
http://secunia.com/product/5852/

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.

SOLUTION:
Desktop on-access scanner should be used to ensure that the malware
is detected upon extraction.

Filter all compressed file archives at border gateways if they are
not required.

PROVIDED AND/OR DISCOVERED BY:
fRoGGz, SecuBox Labs

ORIGINAL ADVISORY:
http://shadock.net/secubox/AVCraftedArchive.html

----------------------------------------------------------------------

About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

----------------------------------------------------------------------

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