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Vigil@nce - QEMU: denial of service against the Network Block Device server

August 2017 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An attacker can start NBD connexions to QEMU, in order to trigger
a denial of service.

Impacted products: Debian, QEMU, RHEL.

Severity: 2/4.

Creation date: 13/06/2017.

DESCRIPTION OF THE VULNERABILITY

QEMU includes a "Network Block Device" server, which emulates a
kind a remote raw disk.

However, when the NBS signalling is aborted at connexion time, a
data structure becomes invalid, which leads to the use of an
invalid pointer and a fatal exception.

An attacker can therefore start NBD connexions to QEMU, in order
to trigger a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/QEMU-denial-of-service-against-the-Network-Block-Device-server-22953


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