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Vigil@nce - Xen: invalid pointer dereference via HVMOP_track_dirty_vram

September 2014 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An attacker can force an invalid pointer to be dereferenced in
HVMOP_track_dirty_vram of Xen, in order to trigger a denial of
service.

 Impacted products: Unix (platform)
 Severity: 1/4
 Creation date: 23/09/2014

DESCRIPTION OF THE VULNERABILITY

Hypercalls are called from a guest system, in order to provide a
feature equivalent to a system call on the host system.

However, the HVMOP_track_dirty_vram hypercall does not lock the
access to a pointer, before using it.

An attacker can therefore force an invalid pointer to be
dereferenced in HVMOP_track_dirty_vram of Xen, in order to trigger
a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Xen-invalid-pointer-dereference-via-HVMOP-track-dirty-vram-15390


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