This script is Copyright (C) 2012 Tenable Network Security, Inc.
The remote SuSE 10 host is missing a security-related patch.
Three security issues were found in XEN.
Two security issues are fixed by this update :
- Due to incorrect fault handling in the XEN hypervisor it
was possible for a XEN guest domain administrator to
execute code in the XEN host environment.
- Also a guest user could crash the guest XEN kernel due
to a protection fault bounce. (CVE-2012-0218)
The third fix is changing the Xen behaviour on certain hardware :
- The issue is a denial of service issue on older pre-SVM
AMD CPUs (AMD Erratum 121). (CVE-2012-2934)
AMD Erratum #121 is described in 'Revision Guide for AMD
Athlon 64 and AMD Opteron Processors':
The following 130nm and 90nm (DDR1-only) AMD processors
are subject to this erratum :
First-generation AMD-Opteron(tm) single and dual core
processors in either 939 or 940 packages :
- AMD Opteron(tm) 100-Series Processors
- AMD Opteron(tm) 200-Series Processors
- AMD Opteron(tm) 800-Series Processors
- AMD Athlon(tm) processors in either 754, 939 or 940
- AMD Sempron(tm) processor in either 754 or 939 packages
- AMD Turion(tm) Mobile Technology in 754 package This
issue does not effect Intel processors.
The impact of this flaw is that a malicious PV guest
user can halt the host system.
As this is a hardware flaw, it is not fixable except by
upgrading your hardware to a newer revision, or not
allowing untrusted 64bit guestsystems.
The patch changes the behaviour of the host system
booting, which makes it unable to create guest machines
until a specific boot option is set.
There is a new XEN boot option 'allow_unsafe' for GRUB
which allows the host to start guests again.
This is added to /boot/grub/menu.lst in the line looking
like this :
kernel /boot/xen.gz .... allow_unsafe
Note: .... in this example represents the existing boot
options for the host.
See also :
Apply ZYPP patch number 8180.
Risk factor :
High / CVSS Base Score : 7.2
Public Exploit Available : true