Vigil@nce - Xen: use after free via Block Frontend
February 2021 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/computer-vulne...
SYNTHESIS OF THE VULNERABILITY
Impacted products: XenServer, Debian, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Xen.
Consequences: administrator access/rights, denial of service on server, denial of service on service.
Provenance: user shell.
Confidence: confirmed by the editor (5/5).
Creation date: 15/12/2020.
DESCRIPTION OF THE VULNERABILITY
An attacker, inside a guest system, can force the usage of a freed memory area via Block Frontend of Xen, in order to trigger a denial of service, and possibly to run code on the host system.
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