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Xen Privilege Escalation and Denial of Service Vulnerabilities

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Release Date:  2012-06-12    Views:  1,599

Secunia Advisory SA49381

Where:

Local system

Impact:

Privilege escalation, DoS

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

Description


Two vulnerabilities have been reported in Xen, which can be exploited by malicious, local users in a guest virtual machine to cause a DoS (Denial of Service) and gain escalated privileges.

1) An error when handling certain system calls can be exploited to gain additional privileges.

Successful exploitation of this vulnerability requires a 64-bit PV guest kernel running on a 64-bit hypervisor.

2) An error when handling exceptions does not properly clear a flag, which can be exploited to cause a crash.

Note: This vulnerability does not affect HVM guests.

The vulnerabilities are reported in versions 3.4, 4.0, and 4.1.

Note: Additionally, a weakness exists within 64-bit PV guests, which can lead to CPU lock ups.


Solution:
Apply patches (please see the vendor's advisory for more information).

Provided and/or discovered by:
1) The vendor credits Rafal Wojtczuk.
2) Reported by the vendor.

Original Advisory:
XSA-7:
http://lists.xen.org/archives/html/xen-announce/2012-06/msg00001.html

XSA-8:
http://lists.xen.org/archives/html/xen-announce/2012-06/msg00003.html

XSA-9:
http://lists.xen.org/archives/html/xen-announce/2012-06/msg00002.html

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 Privilege Escalation and Denial of Service Vulnerabilities

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