Permissions, Privileges, and Access Controls in Xen

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU43024

Risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2013-0215

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to #BASIC_IMPACT#.

oxenstored in Xen 4.1.x, Xen 4.2.x, and xen-unstable does not properly consider the state of the Xenstore ring during read operations, which allows guest OS users to cause a denial of service (daemon crash and host-control outage, or memory consumption) or obtain sensitive control-plane data by leveraging guest administrative access.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Xen: 4.1.0 - 4.2.1

CPE2.3

• cpe:2.3:a:xen_project:xen:4.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:xen_project:xen:4.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:xen_project:xen:4.1.2:*:*:*:*:*:*:*

External links

https://openwall.com/lists/oss-security/2013/02/05/10
https://secunia.com/advisories/55082
https://security.gentoo.org/glsa/glsa-201309-24.xml
https://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=40f9c5e0a6d15b4ca1f6d4ed3a46f0871520eab5
https://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=61401264eb00fae4ee4efc8e9a5067449283207b

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.