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Vigil@nce: Ghostscript, buffer overflow via PDF

December 2009 by Vigil@nce

An attacker can invite the victim to see a malicious PDF document, in order to stop Ghostscript, or to execute code.

Severity: 2/4

Consequences: user access/rights, denial of service of client

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: 21/12/2009

IMPACTED PRODUCTS

- Unix - plateform

DESCRIPTION OF THE VULNERABILITY

The Ghostscript program displays PDF or PostScript documents.

Since version 8.64, Ghostscript uses the errprintf() and outprintf() functions to log errors. However, these functions call the vsprintf() function, without checking the size of error messages, which generates a buffer overflow.

An attacker can therefore invite the victim to see a malicious PDF document, generating an error, in order to stop Ghostscript, or to execute code.

CHARACTERISTICS

Identifiers: 540760, 690829, BID-37410, CVE-2009-4270, VIGILANCE-VUL-9307

http://vigilance.fr/vulnerability/G...




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