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Vigil@nce: Linux kernel, buffer overflow via CIFS

April 2009 by Vigil@nce

SYNTHESIS OF THE VULNERABILITY

An attacker can setup a malicious CIFS server and invite the
victim to mount a share in order to generate an overflow in the
kernel.

Severity: 2/4

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

Provenance: intranet server

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/cifs directory of the Linux kernel source code implements a
CIFS/SMB client, used to mount a filesystem on a remote share.

The CIFSTCon() function of the fs/cifs/connect.c file implements
the TreeConnectAndX command. The answer to this command contains
the "nativeFileSystem" field whose value is generally NTFS, FAT or
SAMBA.

However, if the nativeFileSystem field is too long, a buffer
overflow occurs in the CIFSTCon() function.

An attacker can therefore setup a malicious CIFS server and invite
the victim to mount a share in order to generate an overflow in
the kernel.

CHARACTERISTICS

Identifiers: BID-34453, VIGILANCE-VUL-8602

http://vigilance.fr/vulnerability/Linux-kernel-buffer-overflow-via-CIFS-8602


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