Debian DSA-4201-1 : xen - security update

high Nessus Plugin ID 109816
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

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

Description

Multiple vulnerabilities have been discovered in the Xen hypervisor :

- CVE-2018-8897 Andy Lutomirski and Nick Peterson discovered that incorrect handling of debug exceptions could result in privilege escalation.

- CVE-2018-10471 An error was discovered in the mitigations against Meltdown which could result in denial of service.

- CVE-2018-10472 Anthony Perard discovered that incorrect parsing of CDROM images can result in information disclosure.

- CVE-2018-10981 Jan Beulich discovered that malformed device models could result in denial of service.

- CVE-2018-10982 Roger Pau Monne discovered that incorrect handling of high precision event timers could result in denial of service and potentially privilege escalation.

Solution

Upgrade the xen packages.

For the stable distribution (stretch), these problems have been fixed in version 4.8.3+xsa262+shim4.10.0+comet3-1+deb9u6.

See Also

https://security-tracker.debian.org/tracker/CVE-2018-8897

https://security-tracker.debian.org/tracker/CVE-2018-10471

https://security-tracker.debian.org/tracker/CVE-2018-10472

https://security-tracker.debian.org/tracker/CVE-2018-10981

https://security-tracker.debian.org/tracker/CVE-2018-10982

https://security-tracker.debian.org/tracker/source-package/xen

https://packages.debian.org/source/stretch/xen

https://www.debian.org/security/2018/dsa-4201

Plugin Details

Severity: High

ID: 109816

File Name: debian_DSA-4201.nasl

Version: 1.13

Type: local

Agent: unix

Published: 5/16/2018

Updated: 4/5/2019

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Critical

Score: 9.6

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

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

Temporal Vector: E:H/RL:OF/RC:C

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 8.4

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: E:H/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:xen, cpe:/o:debian:debian_linux:9.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/15/2018

Exploitable With

Metasploit (Microsoft Windows POP/MOV SS Local Privilege Elevation Vulnerability)

Reference Information

CVE: CVE-2018-10471, CVE-2018-10472, CVE-2018-10981, CVE-2018-10982, CVE-2018-8897

DSA: 4201