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TITLE:
Xen "flask_op" Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA31561

VERIFY ADVISORY:
http://secunia.com/advisories/31561/

CRITICAL:
Less critical

IMPACT:
Security Bypass, DoS

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 cause a DoS (Denial of Service) or
potentially bypass certain security restrictions.

The vulnerability is caused due to an error when processing the
"flask_op" hypercall. This can be exploited by DomU users to cause a
heap-based buffer overflow and execute arbitrary code with Dom0
privileges.

Successful exploitation requires that Xen is compiled with support
for the "XSM:FLASK" module.

The vulnerability is reported in version 3.3. Other versions may also
be affected.

SOLUTION:
Fixed in the mercurial repository.
http://xenbits.xensource.com/xen-3.3-testing.hg?rev/fa66b33f975a

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Rafal Wojtczuk, McAfee

ORIGINAL ADVISORY:
http://www.nabble.com/-PATCH--XSM--FLASK--Argument-handling-bugs-in-XSM:FLASK-to18536032.html
http://xenbits.xensource.com/xen-3.3-testing.hg?rev/fa66b33f975a

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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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