#VU33833 Input validation error in Xen - CVE-2014-9065

Vulnerability identifier: #VU33833

Vulnerability risk: Low

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2014-9065

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a local #AU# to perform a denial of service (DoS) attack.

common/spinlock.c in Xen 4.4.x and earlier does not properly handle read and write locks, which allows local x86 guest users to cause a denial of service (write denial or NMI watchdog timeout and host crash) via a large number of read requests, a different vulnerability to CVE-2014-9066.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 4.24

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External links
https://lists.opensuse.org/opensuse-security-announce/2015-02/msg00005.html
https://lists.opensuse.org/opensuse-security-announce/2015-02/msg00010.html
https://www.openwall.com/lists/oss-security/2014/12/08/4
https://www.securityfocus.com/bid/71544
https://xenbits.xen.org/xsa/advisory-114.html
https://security.gentoo.org/glsa/201504-04

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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.