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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/...




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