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Vigil@nce: Linux kernel, denial of service via WiFi

August 2009 by Vigil@nce

SYNTHESIS OF THE VULNERABILITY

An attacker can send WiFi Beacon frames in order to stop the Linux kernel.

Severity: 1/4

Consequences: denial of service of computer

Provenance: radio connection

Means of attack: 1 attack

Ability of attacker: technician (2/4)

Confidence: confirmed by the editor (5/5)

Diffusion of the vulnerable configuration: high (3/3)

Creation date: 17/08/2009

IMPACTED PRODUCTS

- Linux kernel

DESCRIPTION OF THE VULNERABILITY

A 802.11 host periodically scans the network, and the access point answers a Beacon (Probe Response) containing the SSID (Service Set IDentifier). A Beacon can contain optional information (named "IE", Information Elements).

The cmp_ies() function of the net/wireless/scan.c file compares received IEs. However, when the Linux kernel receives a Beacon with no IE, followed by a Beacon with one IE, a NULL pointer is dereferenced in cmp_ies().

An attacker can therefore send WiFi Beacon frames in order to stop the Linux kernel, when it scans the network.

CHARACTERISTICS

Identifiers: VIGILANCE-VUL-8952

http://vigilance.fr/vulnerability/L...




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