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Vigil@nce: Linux kernel, buffer overflow via Bluetooth L2CAP

July 2011 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer/0

SYNTHESIS OF THE VULNERABILITY

A remote attacker can send a malicious Bluetooth L2CAP packet, in
order to corrupt the kernel memory, which leads to a denial of
service and possibly to code execution.

 Severity: 2/4
 Creation date: 27/06/2011

IMPACTED PRODUCTS

 Fedora
 Linux kernel

DESCRIPTION OF THE VULNERABILITY

The L2CAP (Logical Link Control and Adaptation Protocol) protocol
adapts application data (SDP, RFCOMM, TCS, etc.) before
transmitting them to the HCI layer of Bluetooth.

The l2cap_config_req() function of the file
net/bluetooth/l2cap_core.c processes L2CAP packets of type
Configuration. However, when the header indicates a short command
size, a subtraction return a negative result, and a large memory
area is copied.

A remote attacker can therefore send a malicious Bluetooth L2CAP
packet, in order to corrupt the kernel memory, which leads to a
denial of service and possibly to code execution.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Linux-kernel-buffer-overflow-via-Bluetooth-L2CAP-10779


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