#VU33918 Input validation error in Xen - CVE-2012-5514

Vulnerability identifier: #VU33918

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2012-5514

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

The guest_physmap_mark_populate_on_demand function in Xen 4.2 and earlier does not properly unlock the subject GFNs when checking if they are in use, which allows local guest HVM administrators to cause a denial of service (hang) via unspecified vectors.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 4.0.0 - 4.14.0

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External links
https://lists.opensuse.org/opensuse-security-announce/2012-12/msg00001.html
https://lists.opensuse.org/opensuse-security-announce/2012-12/msg00018.html
https://lists.opensuse.org/opensuse-security-announce/2012-12/msg00019.html
https://lists.opensuse.org/opensuse-security-announce/2013-01/msg00011.html
https://lists.opensuse.org/opensuse-security-announce/2014-03/msg00021.html
https://lists.opensuse.org/opensuse-updates/2013-04/msg00051.html
https://lists.opensuse.org/opensuse-updates/2013-04/msg00052.html
https://secunia.com/advisories/51397
https://secunia.com/advisories/51468
https://secunia.com/advisories/51486
https://secunia.com/advisories/51487
https://secunia.com/advisories/55082
https://security.gentoo.org/glsa/glsa-201309-24.xml
https://support.citrix.com/article/CTX135777
https://www.debian.org/security/2012/dsa-2582
https://www.openwall.com/lists/oss-security/2012/12/03/12
https://www.osvdb.org/88130
https://www.securityfocus.com/bid/56803
https://exchange.xforce.ibmcloud.com/vulnerabilities/80483

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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.