Debian DSA-2501-1 : xen - several vulnerabilities

high Nessus Plugin ID 59779
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Synopsis

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

Description

Several vulnerabilities were discovered in Xen, a hypervisor.

- CVE-2012-0217 Xen does not properly handle uncanonical return addresses on Intel amd64 CPUs, allowing amd64 PV guests to elevate to hypervisor privileges. AMD processors, HVM and i386 guests are not affected.

- CVE-2012-0218 Xen does not properly handle SYSCALL and SYSENTER instructions in PV guests, allowing unprivileged users inside a guest system to crash the guest system.

- CVE-2012-2934 Xen does not detect old AMD CPUs affected by AMD Erratum #121.

For CVE-2012-2934, Xen refuses to start domUs on affected systems unless the 'allow_unsafe' option is passed.

Solution

Upgrade the xen packages.

For the stable distribution (squeeze), these problems have been fixed in version 4.0.1-5.2.

See Also

https://security-tracker.debian.org/tracker/CVE-2012-0217

https://security-tracker.debian.org/tracker/CVE-2012-0218

https://security-tracker.debian.org/tracker/CVE-2012-2934

https://security-tracker.debian.org/tracker/CVE-2012-2934

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

https://www.debian.org/security/2012/dsa-2501

Plugin Details

Severity: High

ID: 59779

File Name: debian_DSA-2501.nasl

Version: 1.16

Type: local

Agent: unix

Published: 6/29/2012

Updated: 1/11/2021

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Critical

Score: 9.8

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

Vulnerability Information

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

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: 6/24/2012

Vulnerability Publication Date: 6/12/2012

Exploitable With

CANVAS (CANVAS)

Core Impact

Metasploit (FreeBSD Intel SYSRET Privilege Escalation)

Reference Information

CVE: CVE-2012-0217, CVE-2012-0218, CVE-2012-2934

BID: 53856, 53955, 53961

DSA: 2501