FreeBSD : xen-kernel -- x86 PV guests may be able to mask interrupts (3ae078ca-c7eb-11e6-ae1b-002590263bf5)

Medium Nessus Plugin ID 96058

Synopsis

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

Description

The Xen Project reports :

Certain PV guest kernel operations (page table writes in particular) need emulation, and use Xen's general x86 instruction emulator. This allows a malicious guest kernel which asynchronously modifies its instruction stream to effect the clearing of EFLAGS.IF from the state used to return to guest context.

A malicious guest kernel administrator can cause a host hang or crash, resulting in a Denial of Service.

Solution

Update the affected package.

See Also

https://xenbits.xen.org/xsa/advisory-202.html

http://www.nessus.org/u?9f6e0b40

Plugin Details

Severity: Medium

ID: 96058

File Name: freebsd_pkg_3ae078cac7eb11e6ae1b002590263bf5.nasl

Version: 3.7

Type: local

Published: 2016/12/22

Updated: 2018/11/10

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 4.9

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

CVSS v3.0

Base Score: 6

Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/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: 2016/12/22

Vulnerability Publication Date: 2016/12/21

Reference Information

CVE: CVE-2016-10024