exploit the possibilities

Secunia Security Advisory 51397

Secunia Security Advisory 51397
Posted Dec 4, 2012
Authored by Secunia | Site secunia.com

Secunia Security Advisory - 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.

tags | advisory, denial of service, local, vulnerability
MD5 | fadca92b803802f29046d3b4a5bb07fc

Secunia Security Advisory 51397

Change Mirror Download
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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/

----------------------------------------------------------------------

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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