From: Secunia Security Advisories (sec-advsecunia.com)
Date: Mon Apr 22 2013 - 22:13:55 CDT

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TITLE:
Xen SYSENTER Handling NT Flag Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA53023

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/53023/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=53023

RELEASE DATE:
2013-04-22

DISCUSS ADVISORY:
http://secunia.com/advisories/53023/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/53023/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=53023

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

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 the application not clearing the
NT flag when handling the SYSENTER instruction, which can be
exploited to cause a general protection fault on an IRET and crash
the host.

Successful exploitation requires that a 64-bit ParaVirtual OPerationS
(PVOPS) guest is used.

The vulnerability is reported in versions 3.1 and later running on
Intel platforms.

SOLUTION:
Apply patch if available.

Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

ORIGINAL ADVISORY:
XSA-44:
http://lists.xen.org/archives/html/xen-announce/2013-04/msg00004.html
http://lists.xen.org/archives/html/xen-announce/2013-04/msg00005.html

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

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Please Note:
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clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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