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Vigil@nce: Linux kernel, overflow via NFS

April 2009 by Vigil@nce

SYNTHESIS OF THE VULNERABILITY

An attacker can access to a file with a long name shared via NFS
in order to generate an overflow.

Severity: 2/4

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

Provenance: user shell

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: 06/04/2009

IMPACTED PRODUCTS

 Linux kernel

DESCRIPTION OF THE VULNERABILITY

The fs/nfs directory of the Linux kernel source code implements a
NFS client.

The maximal size of a NFS file is defined by NFS[234]_MAXNAMLEN.
However, the NFS client accepts to use longer names, which
generates an overflow in the kernel.

An attacker can therefore access to a file with a long name shared
via NFS in order to generate an overflow. This error stops the
kernel and can lead to code execution.

CHARACTERISTICS

Identifiers: BID-34390, VIGILANCE-VUL-8601

http://vigilance.fr/vulnerability/Linux-kernel-overflow-via-NFS-8601


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