FreeBSD : xen-kernel -- x86 HVM: Overflow of sh_ctxt->seg_reg[] (4aae54be-ba4d-11e6-ae1b-002590263bf5)

medium Nessus Plugin ID 95502

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Synopsis

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

Description

The Xen Project reports :

x86 HVM guests running with shadow paging use a subset of the x86 emulator to handle the guest writing to its own pagetables. There are situations a guest can provoke which result in exceeding the space allocated for internal state.

A malicious HVM guest administrator can cause Xen to fail a bug check, causing a denial of service to the host.

Solution

Update the affected package.

See Also

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214936

https://xenbits.xen.org/xsa/advisory-187.html

http://www.nessus.org/u?2cad1070

Plugin Details

Severity: Medium

ID: 95502

File Name: freebsd_pkg_4aae54beba4d11e6ae1b002590263bf5.nasl

Version: 3.3

Type: local

Published: 12/5/2016

Updated: 1/4/2021

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Low

Base Score: 1.5

Vector: AV:L/AC:M/Au:S/C:N/I:N/A:P

CVSS v3

Risk Factor: Medium

Base Score: 4.1

Vector: CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/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: 12/4/2016

Vulnerability Publication Date: 9/8/2016

Reference Information

CVE: CVE-2016-7094