Information disclosure in Xen

1) Information disclosure

EUVDB-ID: #VU32626

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 - Information exposure

Exploit availability: No

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

CPE2.3

• cpe:2.3:a:xen_project:xen:3.3.0:*:*:*:*:*:*:*
• cpe:2.3:a:xen_project:xen:3.3.1:*:*:*:*:*:*:*
• cpe:2.3:a:xen_project:xen:3.3.2:*:*:*:*:*:*:*

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

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.