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

high Nessus Plugin ID 89011

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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: High

ID: 89011

File Name: freebsd_pkg_7ed7c36fddaf11e5b2bd002590263bf5.nasl

Version: 2.4

Type: local

Published: 2/29/2016

Updated: 1/4/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.5

CVSS v2

Risk Factor: Medium

Base Score: 6.9

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

CVSS v3

Risk Factor: High

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

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

Patch Publication Date: 2/28/2016

Vulnerability Publication Date: 1/20/2016

Reference Information

CVE: CVE-2016-1570