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SYNTHESIS OF THE VULNERABILITY

An attacker can create a RAR, CAB or ZIP archive containing a
virus which is not detected by Trend Micro.

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)

Number of vulnerabilities in this bulletin: 3

Creation date: 30/04/2009

IMPACTED PRODUCTS

– Trend Micro Internet Security
– Trend Micro InterScan Messaging Security Suite
– Trend Micro InterScan Web Security Suite
– Trend Micro ScanMail
– Trend Micro ServerProtect

DESCRIPTION OF THE VULNERABILITY

Trend Micro products detect viruses contained in RAR, CAB and ZIP
archives.

However, an attacker can create a slightly malformed archive,
which can still be opened by Unrar/Unzip tools, but which cannot
be opened by the antivirus.

Depending on Trend Micro product, these archives are handled in
three ways:

OfficeScan and ServerProtect are vulnerable when Unrar/Unzip
extracts the file on the desktop computer. These products are thus
vulnerable when installed on a scan server. [grav:2/4]

InterScan Web Security Suite and InterScan Messaging Security
quarantine the file by default. These products are vulnerable if
the administrator changed the default configuration. [grav:2/4]

ScanMail does not indicate that the unscanned archive potentially
contains a virus. This product is vulnerable in its default
configuration. [grav:2/4]

An attacker can therefore create a RAR, CAB or ZIP archive
containing a virus which is not detected by Trend Micro.

CHARACTERISTICS

Identifiers: BID-34763, TZO-17-2009, VIGILANCE-VUL-8683

http://vigilance.fr/vulnerability/Trend-Micro-bypassing-via-RAR-CAB-and-ZIP-8683