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

High Nessus Plugin ID 95503


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


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.


Update the affected package.

See Also

Plugin Details

Severity: High

ID: 95503

File Name: freebsd_pkg_4bf57137ba4d11e6ae1b002590263bf5.nasl

Version: $Revision: 3.1 $

Type: local

Published: 2016/12/05

Modified: 2016/12/05

Dependencies: 12634

Risk Information

Risk Factor: High


Base Score: 7.2

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C


Base Score: 6.7

Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:xen-kernel, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Patch Publication Date: 2016/12/04

Vulnerability Publication Date: 2016/09/08

Reference Information

CVE: CVE-2016-7154