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

high Nessus Plugin ID 92674

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Synopsis

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

Description

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.

Solution

Update the affected package.

See Also

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211482

http://xenbits.xen.org/xsa/advisory-182.html

http://www.nessus.org/u?cfdf259e

Plugin Details

Severity: High

ID: 92674

File Name: freebsd_pkg_032aa524585411e6b334002590263bf5.nasl

Version: 2.12

Type: local

Published: 8/2/2016

Updated: 1/4/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.5

CVSS v2

Risk Factor: High

Base Score: 7.2

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

CVSS v3

Risk Factor: High

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: 8/2/2016

Vulnerability Publication Date: 7/26/2016

Reference Information

CVE: CVE-2016-6258

IAVB: 2016-B-0118-S