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Vigil@nce - Xen: information disclosure via HVM CR0.TS/EM

October 2016 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An attacker can use CR0.TS/EM on Xen x86 HVM, in order to obtain
sensitive information on the current system.

Impacted products: XenServer, Fedora, Xen.

Severity: 1/4.

Creation date: 04/10/2016.

DESCRIPTION OF THE VULNERABILITY

The Xen product can manage x86 HVM guest systems.

However, an attacker can raise a Device Not Available Exception
while CR0.EM or CR0.TS are set, which can be used to read a
register of another task on the same VM.

An attacker can therefore use CR0.TS/EM on Xen x86 HVM, in order
to obtain sensitive information on the current system.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/Xen-information-disclosure-via-HVM-CR0-TS-EM-20762


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