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vulnerability bulletin CVE-2017-9524

QEMU: denial of service against the Network Block Device server

Synthesis of the vulnerability

An attacker can start NBD connexions to QEMU, in order to trigger a denial of service.
Impacted products: Debian, Fedora, QEMU, RHEL, Ubuntu.
Severity: 2/4.
Creation date: 13/06/2017.
Identifiers: CVE-2017-9524, DSA-3920-1, DSA-3925-1, FEDORA-2017-b7f1197c23, RHSA-2017:1681-01, USN-3414-1, USN-3414-2, VIGILANCE-VUL-22953.

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.
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