#VU41861 Input validation error in Xen - CVE-2014-1895

Vulnerability identifier: #VU41861

Vulnerability risk: Low

CVSSv4.0: 4.4 [CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2014-1895

CWE-ID: CWE-20

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a remote #AU# to #BASIC_IMPACT#.

Off-by-one error in the flask_security_avc_cachestats function in xsm/flask/flask_op.c in Xen 4.2.x and 4.3.x, when the maximum number of physical CPUs are in use, allows local users to cause a denial of service (host crash) or obtain sensitive information from hypervisor memory by leveraging a FLASK_AVC_CACHESTAT hypercall, which triggers a buffer over-read.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 4.2.0 - 4.3.1

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External links
https://lists.opensuse.org/opensuse-security-announce/2014-03/msg00011.html
https://security.gentoo.org/glsa/glsa-201407-03.xml
https://www.openwall.com/lists/oss-security/2014/02/07/12
https://www.openwall.com/lists/oss-security/2014/02/10/6
https://xenbits.xen.org/xsa/advisory-85.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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