Debian DSA-2501-1 : xen - several vulnerabilities

high Nessus Plugin ID 59779


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


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.


Upgrade the xen packages.

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

See Also

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

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information


Risk Factor: Critical

Score: 9.8


Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

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


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