SuSE 10 Security Update : Xen (ZYPP Patch Number 8180)

This script is Copyright (C) 2012 Tenable Network Security, Inc.


Synopsis :

The remote SuSE 10 host is missing a security-related patch.

Description :

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.
(CVE-2012-0217)

- 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':
http://support.amd.com/us/Processor_TechDocs/25759.pdf

The following 130nm and 90nm (DDR1-only) AMD processors
are subject to this erratum :

o

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
packages

- 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 :

http://support.novell.com/security/cve/CVE-2012-0217.html
http://support.novell.com/security/cve/CVE-2012-0218.html
http://support.novell.com/security/cve/CVE-2012-2934.html

Solution :

Apply ZYPP patch number 8180.

Risk factor :

High / CVSS Base Score : 7.2
(CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C)
Public Exploit Available : true

Family: SuSE Local Security Checks

Nessus Plugin ID: 59469 ()

Bugtraq ID:

CVE ID: CVE-2012-0217
CVE-2012-0218
CVE-2012-2934

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