Vulnerability identifier: #VU32626

Vulnerability risk: Low

CVSSv3.1: 3.5 [CVSS:3.1/CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-4361

CWE-ID: CWE-200

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a local non-authenticated attacker to gain access to sensitive information.

The fbld instruction emulation in Xen 3.3.x through 4.3.x does not use the correct variable for the source effective address, which allows local HVM guests to obtain hypervisor stack information by reading the values used by the instruction.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 3.3.0 - 3.3.2

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External links
http://lists.opensuse.org/opensuse-security-announce/2014-03/msg00021.html
http://lists.opensuse.org/opensuse-updates/2013-11/msg00009.html
http://security.gentoo.org/glsa/glsa-201407-03.xml
http://www.debian.org/security/2014/dsa-3006
http://www.openwall.com/lists/oss-security/2013/09/30/3

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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.