Input validation error in Xen

1) Input validation error

EUVDB-ID: #VU32218

Risk: Low

CVSSv3.1: 5.2 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-9385

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a local privileged user to a crash the entire system.

The x86 segment base write emulation functionality in Xen 4.4.x through 4.7.x allows local x86 PV guest OS administrators to cause a denial of service (host crash) by leveraging lack of canonical address checks.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Xen: 4.4.0 - 4.4.4

External links

http://www.securityfocus.com/bid/94472
http://www.securitytracker.com/id/1037342
http://xenbits.xen.org/xsa/advisory-193.html
http://security.gentoo.org/glsa/201612-56
http://support.citrix.com/article/CTX218775

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.