Vulnerability identifier: #VU40576

Vulnerability risk: Medium

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

CVE-ID: CVE-2015-8339

CWE-ID: CWE-19

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

The memory_exchange function in common/memory.c in Xen 3.2.x through 4.6.x does not properly hand back pages to a domain, which might allow guest OS administrators to cause a denial of service (host crash) via unspecified vectors related to domain teardown.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 3.2.0 - 4.6.0

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External links
http://support.citrix.com/article/CTX203451
http://www.debian.org/security/2016/dsa-3519
http://www.securityfocus.com/bid/79038
http://www.securitytracker.com/id/1034391
http://xenbits.xen.org/xsa/advisory-159.html
http://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 non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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