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SYNTHESIS OF THE VULNERABILITY

An attacker can create an archive containing a virus, which is not
detected by Grisoft AVG Anti-Virus.

Severity: 1/4

Creation date: 21/03/2012

IMPACTED PRODUCTS

– Grisoft AVG Anti-Virus

DESCRIPTION OF THE VULNERABILITY

Tools extracting archives accept to extract archives which are
slightly malformed. However, Grisoft AVG Anti-Virus does not
detect viruses contained in these archives.

A RAR archive containing "MZ" as its first 2 bytes bypasses the
detection. [severity:1/4; BID-52612, CVE-2012-1443]

A ZIP archive starting by TAR data bypasses the detection.
[severity:1/4; BID-52608, CVE-2012-1456]

A TAR archive with a large size bypasses the detection.
[severity:1/4; BID-52610, CVE-2012-1457]

A TAR archive with a header containing a large value bypasses the
detection. [severity:1/4; BID-52623, CVE-2012-1459]

A TAR+GZ archive containing two streams bypasses the detection.
[severity:1/4; BID-52626, CVE-2012-1461]

A ZIP archive starting by 1024 random bytes bypasses the
detection. [severity:1/4; BID-52613, CVE-2012-1462]

An attacker can therefore create an archive containing a virus
which is not detected by the antivirus, but which is extracted by
extraction tools. The virus is then detected once it has been
extracted on victim’s computer.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Grisoft-AVG-Anti-Virus-bypassing-via-RAR-TAR-ZIP-11480