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Vigil@nce: AVG Anti-Virus, bypassing via ZIP

May 2009 by Vigil@nce

SYNTHESIS OF THE VULNERABILITY

An attacker can create a ZIP archive containing a virus which is
not detected by AVG.

Severity: 2/4

Consequences: data flow

Provenance: document

Means of attack: no proof of concept, no attack

Ability of attacker: expert (4/4)

Confidence: confirmed by the editor (5/5)

Diffusion of the vulnerable configuration: high (3/3)

Creation date: 11/05/2009

IMPACTED PRODUCTS

 Grisoft AVG Anti-Virus

DESCRIPTION OF THE VULNERABILITY

AVG products detect viruses contained in ZIP archives.

However, an attacker can create a slightly malformed archive (by
changing "Filelength"), which can still be opened by Unzip tools,
but which cannot be opened by the antivirus.

An attacker can therefore create a ZIP archive containing a virus
which is not detected by AVG.

CHARACTERISTICS

Identifiers: BID-34895, TZO-20-2009, VIGILANCE-VUL-8704

http://vigilance.fr/vulnerability/AVG-Anti-Virus-bypassing-via-ZIP-8704


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