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TITLE:
Xen Privilege Escalation and Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA49381

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/49381/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=49381

RELEASE DATE:
2012-06-12

DISCUSS ADVISORY:
http://secunia.com/advisories/49381/#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/49381/

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=49381

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:
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

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.

Subscribe:
http://secunia.com/advisories/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
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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