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Vigil@nce: netpbm, integer overflow via XPM

February 2010 by Vigil@nce

An attacker can create a malicious XPM image, and invite the victim to convert it with xpmtoppm, in order to generate an overflow leading to a denial of service and possibly to code execution.

- Severity: 2/4
- Consequences: user access/rights, denial of service of service
- 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: 10/02/2010

IMPACTED PRODUCTS

- Unix - plateform

DESCRIPTION OF THE VULNERABILITY

The netpbm suite converts images in PNM formats:
- PPM (Portable Pixmap) : color
- PGM (Portable Greymap) : greyscale
- PBM (Portable Bitmap) : black and white

The xpmtoppm tool converts an XPM image to the PPM format. However, it does not check if the color index is superior to 127, which corrupts the memory.

An attacker can therefore create a malicious XPM image, and invite the victim to convert it with xpmtoppm, in order to generate an overflow leading to a denial of service and possibly to code execution.

CHARACTERISTICS

- Identifiers: BID-38164, CVE-2009-4274, VIGILANCE-VUL-9438
- Url: http://vigilance.fr/vulnerability/n...




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