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=========================================================== Ubuntu Security Notice USN-527-1 October 05, 2007 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 effect the necessary changes. Details follow: Joris van Rantwijk discovered that the Xen host did not correctly validate the contents of a Xen guests's grub.conf file. Xen guest root users could exploit this to run arbitrary commands on the host when the guest system was rebooted.