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Vigil@nce: Citrix XenServer, denial of service via pvops

July 2010 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An attacker located in a Citrix XenServer guest system can use
some system calls to stop the host.

 Severity: 2/4
 Creation date: 29/06/2010

DESCRIPTION OF THE VULNERABILITY

The Linux kernel can be compiled with the support of Xen
paravirt_ops (pvops) in order to be started on a physical
computer, or as a domU guest of Citrix XenServer.

However, an unprivileged attacker located in a Linux domU with
pvops can use two Linux system calls which generate an error in
the dom0. This error stops the Citrix XenServer dom0.

An attacker located in a Citrix XenServer guest system can
therefore use some system calls to stop the host.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Citrix-XenServer-denial-of-service-via-pvops-9734


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