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Vigil@nce - Xen: NULL pointer dereference via MMU Update

November 2014 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An attacker can force a NULL pointer to be dereferenced in MMU
Update of Xen, in order to trigger a denial of service.

Impacted products: Unix (platform)

Severity: 1/4

Creation date: 18/11/2014

DESCRIPTION OF THE VULNERABILITY

The Xen product can be configured with a PV domain with privileges
over HVM guest systems with HAP (Hardware Assisted Paging) or PVH
(PV Hybrid, which virtualize memory pages) systems, usually via
qemu-dm.

However, in this configuration, the do_mmu_update() function of
the xen/arch/x86/mm.c file does not check if a pointer is NULL,
before using it.

An attacker can therefore force a NULL pointer to be dereferenced
in MMU Update of Xen, in order to trigger a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Xen-NULL-pointer-dereference-via-MMU-Update-15662


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