Debian DSA-4131-1 : xen - security update

Medium Nessus Plugin ID 107123

Synopsis

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

Description

Multiple vulnerabilities have been discovered in the Xen hypervisor :

- CVE-2018-7540 Jann Horn discovered that missing checks in page table freeing may result in denial of service.

- CVE-2018-7541 Jan Beulich discovered that incorrect error handling in grant table checks may result in guest-to-host denial of service and potentially privilege escalation.

- CVE-2018-7542 Ian Jackson discovered that insufficient handling of x86 PVH guests without local APICs may result in guest-to-host denial of service.

Solution

Upgrade the xen packages.

For the stable distribution (stretch), these problems have been fixed in version 4.8.3+comet2+shim4.10.0+comet3-1+deb9u5.

See Also

https://security-tracker.debian.org/tracker/CVE-2018-7540

https://security-tracker.debian.org/tracker/CVE-2018-7541

https://security-tracker.debian.org/tracker/CVE-2018-7542

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

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

http://www.debian.org/security/2018/dsa-4131

Plugin Details

Severity: Medium

ID: 107123

File Name: debian_DSA-4131.nasl

Version: 3.2

Type: local

Agent: unix

Published: 2018/03/05

Modified: 2018/03/19

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSSv2

Base Score: 6.1

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

CVSSv3

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: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

Patch Publication Date: 2018/03/04

Reference Information

CVE: CVE-2018-7540, CVE-2018-7541, CVE-2018-7542

DSA: 4131