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Vigil@nce: Ghostscript, denial of service via JBIG2

October 2009 by Vigil@nce

An attacker can create a PDF file containing a malicious JBIG2
image, in order to stop the Ghostscript application.

Severity: 1/4

Consequences: denial of service of client

Provenance: document

Means of attack: 1 attack

Ability of attacker: technician (2/4)

Confidence: confirmed by the editor (5/5)

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

Creation date: 27/10/2009

IMPACTED PRODUCTS

 Fedora
 Unix - plateform

DESCRIPTION OF THE VULNERABILITY

A PDF document is composed of "stream" objects. These objects can
contain pages, images, fonts, etc.

An image can be compressed with the JBIG2 (Joint Bi-level Image
experts Group) compression algorithm.

However, Ghostscript does not correctly checks data of a JBIG2
image when uncompressing it, and a NULL pointer is dererefenced.

An attacker can therefore create a PDF file containing a malicious
JBIG2 image, in order to stop the Ghostscript application.

CHARACTERISTICS

Identifiers: 503785, FEDORA-2009-8270, VIGILANCE-VUL-9125

http://vigilance.fr/vulnerability/Ghostscript-denial-of-service-via-JBIG2-9125


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