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TITLE:
Xen "mov_to_rr" Security Bypass Vulnerability

SECUNIA ADVISORY ID:
SA27915

VERIFY ADVISORY:
http://secunia.com/advisories/27915/

CRITICAL:
Less critical

IMPACT:
Security Bypass

WHERE:
Local system

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

DESCRIPTION:
A vulnerability has been reported in Xen, which can be exploited by
malicious, local users to bypass certain security restrictions.

The vulnerability is caused due to Xen improperly checking RID
(Region Identifier) values in calls to "mov_to_rr". This can be
exploited by an attacker in a VT-i domain to read memory from another
VT-i domain.

The vulnerability is reported in versions prior to 3.1.2 running on
IA64 platforms.

SOLUTION:
Fixed in Mercurial repository.
http://xenbits.xensource.com/xen-3.1-testing.hg

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

ORIGINAL ADVISORY:
http://lists.xensource.com/archives/html/xen-ia64-devel/2007-10/msg00189.html

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