Ubuntu Security Notice USN-527-1 October 05, 2007==========20================================================= xen-3.0 vulnerability CVE-2007-4993 ========================================================== A security issue affects the following Ubuntu releases:
Ubuntu 7.04
This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu.
The problem can be corrected by upgrading your system to the following package versions:
Ubuntu 7.04: xen-utils-3.0 3.0.3-0ubuntu10.1
In general, a standard system upgrade is sufficient to affect the necessary changes.
Details follow:
Joris van Rantwijk discovered that the Xen host did not correctly validate the contents of a Xen guests's grug.conf file. Xen guest root users could exploit this to run arbitrary commands on the host when the guest system was rebooted.