Vulnerability identifier: #VU32479

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2014-7154

CWE-ID: CWE-362

Exploitation vector: Local 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.

Race condition in HVMOP_track_dirty_vram in Xen 4.0.0 through 4.4.x does not ensure possession of the guarding lock for dirty video RAM tracking, which allows certain local guest domains to cause a denial of service via unspecified vectors.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 4.0.0

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External links
http://lists.fedoraproject.org/pipermail/package-announce/2014-October/140418.html
http://lists.fedoraproject.org/pipermail/package-announce/2014-October/140483.html
http://lists.opensuse.org/opensuse-security-announce/2014-10/msg00002.html
http://lists.opensuse.org/opensuse-security-announce/2014-10/msg00003.html
http://secunia.com/advisories/61501
http://secunia.com/advisories/61890
http://security.gentoo.org/glsa/glsa-201412-42.xml
http://www.debian.org/security/2014/dsa-3041
http://www.securitytracker.com/id/1030887
http://xenbits.xen.org/xsa/advisory-104.html

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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 local network (LAN).

Is there known malware, which exploits this vulnerability?

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