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FreeBSD : xen-tools -- PCI MSI mask bits inadvertently exposed to guests (4db8a0f4-27e9-11e5-a4a5-002590263bf5)

high Nessus Plugin ID 84700

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Synopsis

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

Description

The Xen Project reports :

The mask bits optionally available in the PCI MSI capability structure are used by the hypervisor to occasionally suppress interrupt delivery. Unprivileged guests were, however, nevertheless allowed direct control of these bits.

Interrupts may be observed by Xen at unexpected times, which may lead to a host crash and therefore a Denial of Service.

Solution

Update the affected package.

See Also

http://xenbits.xen.org/xsa/advisory-129.html

http://www.nessus.org/u?4f5f23ec

Plugin Details

Severity: High

ID: 84700

File Name: freebsd_pkg_4db8a0f427e911e5a4a5002590263bf5.nasl

Version: 2.4

Type: local

Published: 7/14/2015

Updated: 1/6/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.0

CVSS v2

Risk Factor: High

Base Score: 7.8

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

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:xen-tools, cpe:/o:freebsd:freebsd

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

Patch Publication Date: 7/11/2015

Vulnerability Publication Date: 6/2/2015

Reference Information

CVE: CVE-2015-4104