Vulnerability identifier: #VU41862

Vulnerability risk: Low

CVSSv3.1: 3 [CVSS:3.1/AV:A/AC:L/PR:/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2014-1896

CWE-ID: CWE-20

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a remote #AU# to read and manipulate data.

The (1) do_send and (2) do_recv functions in io.c in libvchan in Xen 4.2.x, 4.3.x, and 4.4-RC series allows local guests to cause a denial of service or possibly gain privileges via crafted xenstore ring indexes, which triggers a "read or write past the end of the ring."

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 4.2.0 - 4.4.0

---

External links
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00011.html
http://security.gentoo.org/glsa/glsa-201407-03.xml
http://www.openwall.com/lists/oss-security/2014/02/07/12
http://www.openwall.com/lists/oss-security/2014/02/10/7
http://xenbits.xen.org/xsa/advisory-86.html
http://xenbits.xen.org/xsa/xsa86.patch

---

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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