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Vigil@nce: LibTIFF, code execution via LZW

August 2008 by Vigil@nce

An attacker can create a malicious TIFF image in order to execute
code on the computer of victims displaying this image with an
application linked to LibTIFF.

 Gravity: 2/4
 Consequences: user access/rights
 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: 27/08/2008
 Identifier: VIGILANCE-VUL-8062

IMPACTED PRODUCTS

- Debian Linux [confidential versions]
- Unix - plateform

DESCRIPTION

The LibTIFF library provides support for TIFF images (Tagged Image
File Format).

A TIFF image can optionally use the LZW (Lempel-Ziv-Welch)
compression algorithm. These images are decoded by the LZWDecode()
and LZWDecodeCompat() functions of tif_lzw.c file.

However, these functions do not correctly handle the CODE_CLEAR
value, which leads to a buffer underflow.

An attacker can therefore create a malicious TIFF image in order
to execute code on the computer of victims displaying this image
with an application linked to LibTIFF.

CHARACTERISTICS

 Identifiers: BID-30832, CVE-2008-2327, DSA 1632-1,
VIGILANCE-VUL-8062
 Url: https://vigilance.aql.fr/tree/1/8062


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