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

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

General

ID: 59469
Name: SuSE 10 Security Update : Xen (ZYPP Patch Number 8180)

Summary: Checks rpm output for the updated packages

Credits: Tenable Network Security, Inc.

Classification

Risk: –

CVSS: –
CVSS Base Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS Temporal Vector: –

Port: 0
Family: SuSE Local Security Checks
Type: Local

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™ single and dual core
processors in either 939 or 940 packages :

– AMD Opteron™ 100-Series Processors

– AMD Opteron™ 200-Series Processors

– AMD Opteron™ 800-Series Processors

– AMD Athlon™ processors in either 754, 939 or 940
packages

– AMD Sempron™ processor in either 754 or 939 packages

– AMD Turion™ 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.

Exploiting

Exploit Available: True
Exploitability Ease: Exploits are available

Sources

CVE: CVE-2012-0217
OSVDB: –
Bugtraq: –
scipID: –

Timeline

Vulnerability Disclosure: –
Patch Release: 2012/06/06
Plugin Release: 2012/06/13

Plugin

Version: 1.5
Filename: suse_xen-201206-8180.nasl
Filesize: 8085 bytes
MD5 Hash: cf287da2b139ae3b541f7d46cfbdfd6b

Identification: Host/local_checks_enabled
Require Keys: Host/local_checks_enabled", "Host/cpu", "Host/SuSE/release", "Host/SuSE/rpm-list
Dependencies: "ssh_get_info.nasl"

Letzte Plugins

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