Vigil@nce - Xen: privilege escalation via evtchn_reset
November 2020 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/offer/Computer...
SYNTHESIS OF THE VULNERABILITY
Impacted products: XenServer, Debian, Fedora, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Xen.
Consequences: administrator access/rights, privileged access/rights.
Provenance: user shell.
Confidence: confirmed by the editor (5/5).
Creation date: 23/09/2020.
DESCRIPTION OF THE VULNERABILITY
An attacker, inside a guest system, can bypass restrictions via evtchn_reset() of Xen, in order to escalate his privileges on the host system.
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