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Vigil@nce: Linux kernel, denial of service of libertas

November 2008 by Vigil@nce

SYNTHESIS

An attacker can send a long WiFi answer in order to stop systems
with a Libertas device.

Gravity: 1/4

Consequences: denial of service of computer

Provenance: radio connection

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: medium (2/3)

Creation date: 20/11/2008

IMPACTED PRODUCTS

 Linux kernel

DESCRIPTION

Files in the drivers/net/wireless/libertas/ directory implements
the support of Libertas WiFi devices.

A 802.11 host periodically scans the network, and the access point
answers a Beacon (Probe Response) containing the SSID (Service Set
IDentifier) indicating the BSS (Basic Service Set).

The lbs_process_bss() function of the drivers/net/wireless/libertas/scan.c
file analyzes these answers. However, if the size of the SSID is
larger than 32 bytes, a buffer overflow occurs. This overflow does
not lead to code execution.

An attacker can therefore send a long WiFi answer in order to stop
systems with a Libertas device.

CHARACTERISTICS

Identifiers: CVE-2008-5134, VIGILANCE-VUL-8261

http://vigilance.fr/vulnerability/8261


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