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Vigil@nce: PyCrypto, buffer overflow of ARC2

March 2009 by Vigil@nce

An attacker can use a long ARC2 key in order to generate an
overflow in PyCrypto.

 Gravity: 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: 26/02/2009

IMPACTED PRODUCTS

 Debian Linux
 Mandriva Corporate
 Mandriva Linux
 Unix - plateform

DESCRIPTION OF THE VULNERABILITY

The PyCrypto module implements cryptographic functions for Python.
It implements ARC2, a block encryption algorithm.

The ARC2 encryption key is stored in a fixed size array, without
checking its size. When the victim uses a long key, an overflow
thus occurs in applications using PyCrypto.

An attacker can therefore use a long ARC2 key in order to generate
an overflow in PyCrypto, leading to a denial of service or to code
execution.

CHARACTERISTICS

 Identifiers: BID-33674, CVE-2009-0544, DSA 1726-1, MDVSA-2009:049,
MDVSA-2009:050, VIGILANCE-VUL-8494
 Url: http://vigilance.fr/vulnerability/PyCrypto-buffer-overflow-of-ARC2-8494


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