Input validation error in Xen

1) Input validation error

EUVDB-ID: #VU33949

Risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2012-2934

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

Xen 4.0, and 4.1, when running a 64-bit PV guest on "older" AMD CPUs, does not properly protect against a certain AMD processor bug, which allows local guest OS users to cause a denial of service (host hang) via sequential execution of instructions across a non-canonical boundary, a different vulnerability than CVE-2012-0217.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Xen: 4.24

CPE2.3

• cpe:2.3:a:xen_project:xen:4.24:*:*:*:*:*:*:*

External links

https://lists.opensuse.org/opensuse-security-announce/2012-11/msg00017.html
https://lists.opensuse.org/opensuse-security-announce/2012-11/msg00018.html
https://lists.xen.org/archives/html/xen-announce/2012-06/msg00002.html
https://secunia.com/advisories/51413
https://secunia.com/advisories/55082
https://security.gentoo.org/glsa/glsa-201309-24.xml
https://support.amd.com/us/Processor_TechDocs/25759.pdf
https://www.debian.org/security/2012/dsa-2501
https://www.securityfocus.com/bid/53961

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.