Debian DLA-964-1 : xen security update

High Nessus Plugin ID 100575

Synopsis

The remote Debian host is missing a security update.

Description

Multiple vulnerabilities have been discovered in the Xen hypervisor.
The Common Vulnerabilities and Exposures project identifies the following problems :

CVE-2016-9932 (XSA-200)

CMPXCHG8B emulation allows local HVM guest OS users to obtain sensitive information from host stack memory.

CVE-2017-7995

Description Xen checks access permissions to MMIO ranges only after accessing them, allowing host PCI device space memory reads.

CVE-2017-8903 (XSA-213)

Xen mishandles page tables after an IRET hypercall which can lead to arbitrary code execution on the host OS. The vulnerability is only exposed to 64-bit PV guests.

CVE-2017-8904 (XSA-214)

Xen mishandles the 'contains segment descriptors' property during GNTTABOP_transfer. This might allow PV guest OS users to execute arbitrary code on the host OS.

CVE-2017-8905 (XSA-215)

Xen mishandles a failsafe callback which might allow PV guest OS users to execute arbitrary code on the host OS.

For Debian 7 'Wheezy', these problems have been fixed in version 4.1.6.lts1-8.

We recommend that you upgrade your xen packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Upgrade the affected packages.

See Also

https://lists.debian.org/debian-lts-announce/2017/06/msg00000.html

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

Plugin Details

Severity: High

ID: 100575

File Name: debian_DLA-964.nasl

Version: 3.4

Type: local

Agent: unix

Published: 2017/06/02

Updated: 2018/07/09

Dependencies: 12634

Risk Information

Risk Factor: High

CVSS v2.0

Base Score: 7.2

Temporal Score: 5.3

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

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 8.8

Temporal Score: 7.7

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libxen-4.1, p-cpe:/a:debian:debian_linux:libxen-dev, p-cpe:/a:debian:debian_linux:libxen-ocaml, p-cpe:/a:debian:debian_linux:libxen-ocaml-dev, p-cpe:/a:debian:debian_linux:libxenstore3.0, p-cpe:/a:debian:debian_linux:xen-docs-4.1, p-cpe:/a:debian:debian_linux:xen-hypervisor-4.1-amd64, p-cpe:/a:debian:debian_linux:xen-hypervisor-4.1-i386, p-cpe:/a:debian:debian_linux:xen-system-amd64, p-cpe:/a:debian:debian_linux:xen-system-i386, p-cpe:/a:debian:debian_linux:xen-utils-4.1, p-cpe:/a:debian:debian_linux:xen-utils-common, p-cpe:/a:debian:debian_linux:xenstore-utils, cpe:/o:debian:debian_linux:7.0

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

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2017/06/01

Reference Information

CVE: CVE-2016-9932, CVE-2017-7995, CVE-2017-8903, CVE-2017-8904, CVE-2017-8905