Vulnerability identifier: #VU8426

Vulnerability risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-14317

CWE-ID: CWE-362

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description
The vulnerability allows an adjacent attacker to cause DoS condition on the host system.

The weakness exists due to race condition in cxenstored. An adjacent attacker can shut down a virtual machine with a stubdomain, trigger a double-free memory error and cause the xenstored daemon to crash.

The vulnerability is exploitable on the systems running the C version os xenstored ("xenstored") and running devicemodel stubdomains.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 4.5.0 - 4.9.0

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External links
http://xenbits.xen.org/xsa/advisory-233.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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