FreeBSD : xen-kernel -- PV superpage functionality missing sanity checks (7ed7c36f-ddaf-11e5-b2bd-002590263bf5)

Medium Nessus Plugin ID 89011

Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

The Xen Project reports :

The PV superpage functionality lacks certain validity checks on data being passed to the hypervisor by guests. This is the case for the page identifier (MFN) passed to MMUEXT_MARK_SUPER and MMUEXT_UNMARK_SUPER sub-ops of the HYPERVISOR_mmuext_op hypercall as well as for various forms of page table updates.

Use of the feature, which is disabled by default, may have unknown effects, ranging from information leaks through Denial of Service to privilege escalation.

Solution

Update the affected packages.

See Also

http://xenbits.xen.org/xsa/advisory-167.html

http://www.nessus.org/u?9e3a7e29

Plugin Details

Severity: Medium

ID: 89011

File Name: freebsd_pkg_7ed7c36fddaf11e5b2bd002590263bf5.nasl

Version: 2.3

Type: local

Published: 2016/02/29

Updated: 2018/11/10

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 6.9

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

CVSS v3.0

Base Score: 8.5

Vector: CVSS:3.0/AV:N/AC:H/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

Patch Publication Date: 2016/02/28

Vulnerability Publication Date: 2016/01/20

Reference Information

CVE: CVE-2016-1570