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Vigil@nce - Xen: memory corruption via the fallback exception handler
May 2017 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
An attacker, inside a guest system, can generate a memory
corruption via the exception handler of Xen, in order to trigger a
denial of service, and possibly to run code on the host system.
Impacted products: XenServer, Fedora, Xen.
Severity: 1/4.
Creation date: 02/05/2017.
DESCRIPTION OF THE VULNERABILITY
The Xen product offers a fallback exception handling mechanism.
However, when returning to the guest user process, the stack
cleanup is wrong.
An attacker, inside a guest system, can therefore generate a
memory corruption via the exception handler of Xen, in order to
trigger a denial of service, and possibly to run code on the host
system.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
https://vigilance.fr/vulnerability/Xen-memory-corruption-via-the-fallback-exception-handler-22627
