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Insecure Library Loading
Not critical

Xen AMD CPU Core Denial of Service Vulnerability

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Release Date:  2013-12-03    Last Update:  2014-02-20    Views:  648

Secunia Advisory SA55840

Where:

Local system

Impact:

DoS

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

Description


A vulnerability has been reported in Xen, which can be exploited by malicious, local users in a guest virtual machine to cause a DoS (Denial of Service).

The vulnerability is caused due to an error related to an AMD CPU when handling instructions and can be exploited to cause a CPU core hang via specific combination of writes to write combined memory types and locked instructions.

Successful exploitation requires the host using family 16h model 00h-0fh AMD CPUs and either a HVM guest or a PV guest with access to a physical device.

The vulnerability is reported in versions 4.1.x, 4.2.x, and 4.3.x.


Solution:
Apply patch.

Further details available to Secunia VIM customers

Provided and/or discovered by:
The vendor credits Jan Beulich.

Original Advisory:
Xen:
http://xenbits.xenproject.org/xsa/advisory-82.html

AMD:
http://support.amd.com/TechDocs/51810_16h_00h-0Fh_Rev_Guide.pdf

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Xen AMD CPU Core Denial of Service Vulnerability

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