#VU32222 Permissions, Privileges, and Access Controls in Xen - CVE-2016-9381

Vulnerability identifier: #VU32222

Vulnerability risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:U/U:Clear]

CVE-ID: CVE-2016-9381

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a local privileged user to execute arbitrary code.

Race condition in QEMU in Xen allows local x86 HVM guest OS administrators to gain privileges by changing certain data on shared rings, aka a "double fetch" vulnerability.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 4.24

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External links
https://www.securityfocus.com/bid/94476
https://www.securitytracker.com/id/1037344
https://xenbits.xen.org/xsa/advisory-197.html
https://security.gentoo.org/glsa/201612-56
https://support.citrix.com/article/CTX218775

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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.