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Less critical

Xen Multiple Vulnerabilities

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Release Date:  2012-12-04    Last Update:  2013-01-18    Views:  2,580

Secunia Advisory SA51397

Where:

Local system

Impact:

Privilege escalation, DoS

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

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
http://lists.xen.org/archives/html/xen-announce/2013-01/msg00005.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 Multiple Vulnerabilities

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