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Vigil@nce - Xen: use after free via xc_cpupool_getinfo

February 2014 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An authenticated attacker can use a freed memory area in a
multithreaded toolstack of Xen, in order to trigger a denial of
service, and possibly to execute code.

Impacted products: Unix (platform)

Severity: 2/4

Creation date: 12/02/2014

DESCRIPTION OF THE VULNERABILITY

The xc_cpupool_getinfo() function returns information on CPUs.

However, if the system is low in free memory, the
xc_cpumap_alloc() function fails, and xc_cpupool_getinfo() returns
a freed memory area.

An authenticated attacker can therefore use a freed memory area in
a multithreaded toolstack of Xen, in order to trigger a denial of
service, and possibly to execute code.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Xen-use-after-free-via-xc-cpupool-getinfo-14237


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