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Vigil@nce - Xen: privilege escalation via VGA Backend

March 2015 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

A local attacker can use the VGA Backend of Xen, in order to
access to a guest system.

Impacted products: Fedora, SUSE Linux Enterprise Desktop, SLES,
Unix (platform)

Severity: 2/4

Creation date: 12/03/2015

DESCRIPTION OF THE VULNERABILITY

When an HVM x86 qemu guest instantiate an emulated VGA device, a
backend is started for SDL or VNC.

However, this backend is started even when the configuration does
not indicate "sdl=1" nor "vnc=1". The impact then depends on the
qemu-xen compilation method:
 if qemu-xen is compiled with SDL: a SDL window is opened with
$DISPLAY
 else: a VNC server listens on localhost

A local attacker can therefore use the VGA Backend of Xen, in
order to access to a guest system.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Xen-privilege-escalation-via-VGA-Backend-16384


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