FreeBSD : xen-kernel -- use after free in FIFO event channel code (4bf57137-ba4d-11e6-ae1b-002590263bf5)

This script is Copyright (C) 2016 Tenable Network Security, Inc.


Synopsis :

The remote FreeBSD host is missing a security-related update.

Description :

The Xen Project reports :

When the EVTCHNOP_init_control operation is called with a bad guest
frame number, it takes an error path which frees a control structure
without also clearing the corresponding pointer. Certain subsequent
operations (EVTCHNOP_expand_array or another EVTCHNOP_init_control),
upon finding the non-NULL pointer, continue operation assuming it
points to allocated memory.

A malicious guest administrator can crash the host, leading to a DoS.
Arbitrary code execution (and therefore privilege escalation), and
information leaks, cannot be excluded.

See also :

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214936
https://xenbits.xen.org/xsa/advisory-188.html
http://www.nessus.org/u?a8dde023

Solution :

Update the affected package.

Risk factor :

High / CVSS Base Score : 7.2
(CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C)

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 95503 ()

Bugtraq ID:

CVE ID: CVE-2016-7154

Ready to Amp Up Your Nessus Experience?

Get Nessus Professional to scan unlimited IPs, run compliance checks & more

Buy Nessus Professional Now