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Vigil@nce: QEMU KVM, buffer overflow of usb_host_handle_control

February 2010 by Vigil@nce

SYNTHESIS OF THE VULNERABILITY

An attacker inside a KVM guest system can access to an USB device, in order to generate an overflow in usb_host_handle_control() leading to a denial of service and possibly to code execution.

Severity: 2/4

Consequences: administrator 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: 09/02/2010

IMPACTED PRODUCTS

- Red Hat Enterprise Linux
- Unix - plateform

DESCRIPTION OF THE VULNERABILITY

When a USB device is plugged, it can be accessed by a KVM guest system.

USB exchanges are handled by the usb_host_handle_control() function of the usb-linux.c file of QEMU KVM. However, if USB control data are too big, a buffer overflow occurs.

An attacker inside a KVM guest system can therefore access to an USB device, in order to generate an overflow in usb_host_handle_control() leading to a denial of service and possibly to code execution.

CHARACTERISTICS

Identifiers: 557025, BID-38158, CVE-2010-0297, RHSA-2010:0088-02, VIGILANCE-VUL-9421

http://vigilance.fr/vulnerability/Q...




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