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SYNTHESIS OF THE VULNERABILITY

A local attacker, who is administrator in a guest system, can
generate an overflow of a Xen Timer, in order to create an
infinite loop on the physical processor.

– Impacted products: XenServer, SUSE Linux Enterprise Desktop, SLES,
Unix (platform)
– Severity: 1/4
– Creation date: 13/11/2012

DESCRIPTION OF THE VULNERABILITY

A watchdog can be configured to perform an operation at a future
date.

The do_vcpu_op() function of the xen/common/domain.c file manages
Xen VCPU. However, if the watchdog date has already expired, a
Timer uses a negative value, and an infinite loop occurs.

A local attacker, who is administrator in a guest system, can
therefore generate an overflow of a Xen Timer, in order to create
an infinite loop on the physical processor.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Xen-infinite-loop-via-Timer-overflow-12134