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The final version of the CSI 6.0 has been released. 
Find out why this is not just another Patch Management solution: http://secunia.com/blog/325/

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TITLE:
Xen Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA51397

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/51397/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=51397

RELEASE DATE:
2012-12-04

DISCUSS ADVISORY:
http://secunia.com/advisories/51397/#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/51397/

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=51397

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:
Multiple 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 potentially gain escalated
privileges.

1) An error when downgrading a grant table version of a guest can be
exploited to cause a hypervisor crash.

2) An error when handling certain HVM control operations can be
exploited to consume physical CPU resources.

3) An array-indexing error in the "HVMOP_set_mem_access" operation
handler can be exploited to cause a crash.

4) An error in the "XENMEM_exchange" handler may result in guest
provided addresses to be included in the hypervisor's reserved
range.

5) An error in the "guest_physmap_mark_populate_on_demand()" function
when checking subject GFNs can be exploited to cause a hang.

6) An error when handling "extent_order" values for
"XENMEM_decrease_reservation", "XENMEM_populate_physmap", and
"XENMEM_exchange" can be exploited to cause a hang.

7) An error in the "get_page_from_gfn()" function when handling an
input GFN can be exploited to reference memory outside of the frame
table.

Please see the vendor's advisory for a list of affected versions.

SOLUTION:
Apply patches (please see the vendor's advisory for details).

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

ORIGINAL ADVISORY:
Xen (XSA-26, XSA-27, XSA-28, XSA-29, XSA-30, XSA-31, XSA-32):
http://lists.xen.org/archives/html/xen-announce/2012-12/msg00000.html
http://seclists.org/oss-sec/2012/q4/401
http://lists.xen.org/archives/html/xen-announce/2012-12/msg00003.html
http://lists.xen.org/archives/html/xen-announce/2012-12/msg00004.html
http://lists.xen.org/archives/html/xen-announce/2012-12/msg00005.html
http://lists.xen.org/archives/html/xen-announce/2012-12/msg00001.html
http://lists.xen.org/archives/html/xen-announce/2012-12/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.

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