#VU32324 Input validation error in Xen - CVE-2016-2270

Vulnerability identifier: #VU32324

Vulnerability risk: Medium

CVSSv4.0: 2.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H/E:U/U:Green]

CVE-ID: CVE-2016-2270

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

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

Xen 4.6.x and earlier allows local guest administrators to cause a denial of service (host reboot) via vectors related to multiple mappings of MMIO pages with different cachability settings.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 4.24

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External links
https://lists.fedoraproject.org/pipermail/package-announce/2016-February/177990.html
https://lists.fedoraproject.org/pipermail/package-announce/2016-March/178518.html
https://www.debian.org/security/2016/dsa-3519
https://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
https://www.securitytracker.com/id/1035042
https://xenbits.xen.org/xsa/advisory-154.html
https://security.gentoo.org/glsa/201604-03

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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 Internet.

Is there known malware, which exploits this vulnerability?

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