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Secunia Security Advisory 28405

Secunia Security Advisory 28405
Posted Jan 10, 2008
Authored by Secunia | Site secunia.com

Secunia Security Advisory - Some vulnerabilities have been reported in Xen, which can be exploited by malicious, local users to cause a DoS (Denial of Service).

tags | advisory, denial of service, local, vulnerability
SHA-256 | 944e383f361585e18d023271c87626378329e99d242962591152f91ebd32462c

Secunia Security Advisory 28405

Change Mirror Download

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

A new version (0.9.0.0 - Release Candidate 1) of the free Secunia PSI
has been released. The new version includes many new and advanced
features, which makes it even easier to stay patched.

Download and test it today:
https://psi.secunia.com/

Read more about this new version:
https://psi.secunia.com/?page=changelog

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

TITLE:
Xen DR7 and CR4 Register Handling Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA28405

VERIFY ADVISORY:
http://secunia.com/advisories/28405/

CRITICAL:
Not critical

IMPACT:
DoS

WHERE:
Local system

SOFTWARE:
Xen 3.x
http://secunia.com/product/15863/

DESCRIPTION:
Some vulnerabilities have been reported in Xen, which can be
exploited by malicious, local users to cause a DoS (Denial of
Service).

1) An error within the handling of the DR7 debug register can be
exploited out of a guest system to crash the hypervisor by setting
certain breakpoints.

Successful exploitation may require that a HVM hypervisor is used.

2) Access to the CR4 register is not properly checked. This can be
exploited out of a guest system to e.g. crash DomU or Dom0 domains.

Successful exploitation may require that a paravirtualised kernel is
used.

SOLUTION:
Restrict access to trusted users only.

PROVIDED AND/OR DISCOVERED BY:
Reported by Jan Beulich.

ORIGINAL ADVISORY:
http://lists.xensource.com/archives/html/xen-devel/2007-10/msg01048.html
http://lists.xensource.com/archives/html/xen-devel/2007-10/msg00932.html

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

About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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

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