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The Internet threat alert status is currently normal. At present, no major epidemics or other serious incidents have been recorded by Kaspersky Lab’s monitoring service. Internet threat level: 1

Xen Multiple Vulnerabilities


Secunia ID

SA51397

CVE-ID

CVE-2012-5510, CVE-2012-5511, CVE-2012-5512, CVE-2012-5513, CVE-2012-5514, CVE-2012-5515, CVE-2012-5525, CVE-2012-6333

Release Date

04 Dec 2012

Last Change

18 Jan 2013

Criticality

Less Critical

Solution Status

Vendor Patch

Software

Xen 3.x
Xen 4.x

Where

Local system

Impact
DoS (Denial of Service)

This includes vulnerabilities ranging from excessive resource consumption (e.g. causing a system to use a lot of memory) to crashing an application or an entire system.

Privilege escalation

This covers vulnerabilities where a user is able to conduct certain tasks with the privileges of other users or administrative users.

This typically includes cases where a local user on a client or server system can gain access to the administrator or root account thus taking full control of the system.

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).

Reported 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