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TITLE:
Xen pygrub Command Injection Vulnerability

SECUNIA ADVISORY ID:
SA26986

VERIFY ADVISORY:
http://secunia.com/advisories/26986/

CRITICAL:
Less critical

IMPACT:
Security Bypass, Privilege escalation

WHERE:
Local system

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

DESCRIPTION:
Joris van Rantwijk has reported a vulnerability in Xen, which can be
exploited by malicious, local users to gain escalated privileges.

The vulnerability is caused due to an input validation error in
tools/pygrub/src/GrubConf.py. This can be exploited by  "root" users
of a guest domain to execute arbitrary commands in domain 0 via
specially crafted entries in grub.conf when the guest system is
booted.

The vulnerability is reported in Xen 3.0.3. Other versions may also
be affected.

SOLUTION:
Grant only trusted users "root" privileges to guest domains.

PROVIDED AND/OR DISCOVERED BY:
Joris van Rantwijk

ORIGINAL ADVISORY:
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1068

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