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TITLE:
Xen XenStore Domain Backend Configuration Weakness

SECUNIA ADVISORY ID:
SA32064

VERIFY ADVISORY:
http://secunia.com/advisories/32064/

CRITICAL:
Not critical

IMPACT:
Security Bypass

WHERE:
Local system

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

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

The weakness is caused due to certain XenStore variables (e.g.
/local/domain/<domid>/console/tty and
/local/domain/<domid>/console/vnc-port) being writable from within
the corresponding Xen DomU domain. This can be exploited to overwrite
the variables, which may be processed with potentially unsafe values
in applications running in Dom0.

SOLUTION:
Restrict access to trusted users only.

PROVIDED AND/OR DISCOVERED BY:
Pascal Bouchareine

ORIGINAL ADVISORY:
http://lists.xensource.com/archives/html/xen-devel/2008-09/msg00992.html
https://bugzilla.redhat.com/show_bug.cgi?id=464818

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