Debian DSA-2666-1 : xen - several vulnerabilities

medium Nessus Plugin ID 66383
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Synopsis

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

Description

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

- CVE-2013-1918 ( XSA 45) several long latency operations are not preemptible.

Some page table manipulation operations for PV guests were not made preemptible, allowing a malicious or buggy PV guest kernel to mount a denial of service attack affecting the whole system.

- CVE-2013-1952 ( XSA 49) VT-d interrupt remapping source validation flaw for bridges.

Due to missing source validation on interrupt remapping table entries for MSI interrupts set up by bridge devices, a malicious domain with access to such a device can mount a denial of service attack affecting the whole system.

- CVE-2013-1964 ( XSA 50) grant table hypercall acquire/release imbalance.

When releasing a particular, non-transitive grant after doing a grant copy operation, Xen incorrectly releases an unrelated grant reference, leading possibly to a crash of the host system.
Furthermore information leakage or privilege escalation cannot be ruled out.

Solution

Upgrade the xen packages.

For the oldstable distribution (squeeze), these problems have been fixed in version 4.0.1-5.11.

For the stable distribution (wheezy), these problems have been fixed in version 4.1.4-3+deb7u1.

Note that for the stable (wheezy), testing and unstable distribution, CVE-2013-1964 ( XSA 50) was already fixed in version 4.1.4-3.

See Also

https://security-tracker.debian.org/tracker/CVE-2013-1918

https://lists.xen.org/archives/html/xen-announce/2013-05/msg00000.html

https://security-tracker.debian.org/tracker/CVE-2013-1952

https://lists.xen.org/archives/html/xen-announce/2013-05/msg00001.html

https://security-tracker.debian.org/tracker/CVE-2013-1964

https://lists.xen.org/archives/html/xen-announce/2013-04/msg00006.html

https://security-tracker.debian.org/tracker/CVE-2013-1964

https://lists.xen.org/archives/html/xen-announce/2013-04/msg00006.html

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

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

https://www.debian.org/security/2013/dsa-2666

Plugin Details

Severity: Medium

ID: 66383

File Name: debian_DSA-2666.nasl

Version: 1.20

Type: local

Agent: unix

Published: 5/13/2013

Updated: 1/11/2021

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.9

Temporal Score: 5.1

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

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:xen, cpe:/o:debian:debian_linux:6.0, cpe:/o:debian:debian_linux:7.0

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

Exploit Ease: No known exploits are available

Patch Publication Date: 5/12/2013

Reference Information

CVE: CVE-2013-1918, CVE-2013-1952, CVE-2013-1964

BID: 59293, 59615, 59617

DSA: 2666