FreeBSD : xen-kernel -- x86: Privilege escalation in PV guests (032aa524-5854-11e6-b334-002590263bf5) (Bunker Buster)

High Nessus Plugin ID 92674


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


The Xen Project reports :

The PV pagetable code has fast-paths for making updates to pre-existing pagetable entries, to skip expensive re-validation in safe cases (e.g. clearing only Access/Dirty bits). The bits considered safe were too broad, and not actually safe.

A malicious PV guest administrator can escalate their privilege to that of the host.


Update the affected package.

See Also

Plugin Details

Severity: High

ID: 92674

File Name: freebsd_pkg_032aa524585411e6b334002590263bf5.nasl

Version: $Revision: 2.9 $

Type: local

Published: 2016/08/02

Modified: 2017/07/06

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: 8.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/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: 2016/08/02

Vulnerability Publication Date: 2016/07/26

Reference Information

CVE: CVE-2016-6258

IAVB: 2016-B-0118