Vulnerability identifier: #VU32503

Vulnerability risk: Low

CVSSv3.1: 5.4 [CVSS:3.1/CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2014-5149

CWE-ID: CWE-399

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

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

Certain MMU virtualization operations in Xen 4.2.x through 4.4.x, when using shadow pagetables, are not preemptible, which allows local HVM guest to cause a denial of service (vcpu consumption) by invoking these operations, which process every page assigned to a guest, a different vulnerability than CVE-2014-5146.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 4.2.0 - 4.2.5

---

External links
http://lists.fedoraproject.org/pipermail/package-announce/2014-August/136980.html
http://lists.fedoraproject.org/pipermail/package-announce/2014-August/136981.html
http://lists.opensuse.org/opensuse-security-announce/2015-02/msg00005.html
http://lists.opensuse.org/opensuse-security-announce/2015-02/msg00010.html
http://www.securityfocus.com/bid/69199
http://www.securitytracker.com/id/1030723
http://xenbits.xen.org/xsa/advisory-97.html
http://exchange.xforce.ibmcloud.com/vulnerabilities/95235
http://security.gentoo.org/glsa/201504-04

---

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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