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Vigil@nce - Xen: privilege escalation via SYSCALL

February 2017 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An attacker can trigger a debug trap on a SYSCALL instruction in a
guest system managed by Xen, in order to get guest operating
system privileges on non Linux systems.

Impacted products: Debian, Fedora, openSUSE, openSUSE Leap, SUSE
Linux Enterprise Desktop, SLES, Xen.

Severity: 2/4.

Creation date: 20/12/2016.

DESCRIPTION OF THE VULNERABILITY

Processing the interrupts, exceptions and traps is part of the job
of the hypervisor Xen.

A user program like a debugger in a guest system can define the
conditions that trigger debug traps. However, Xen wrongly handles
one of these traps when it applies to a SYSCALL instruction, which
triggers a privilege transition as part of the processing of
system calls.

An attacker can therefore trigger a debug trap on a SYSCALL
instruction in a guest system managed by Xen, in order to get
guest operating system privileges on non Linux systems.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/Xen-privilege-escalation-via-SYSCALL-21423


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