Security restrictions bypass in ClusterLabs Pacemaker

1) Improper access control

EUVDB-ID: #VU49118

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-25654

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a local user to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in pacemaker. A local account on the cluster and in the haclient group can use IPC communication with various daemons directly to perform certain tasks that they would be prevented by ACLs from doing if they went through the configuration.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Pacemaker: 1.1.2 - 2.0.4

CPE2.3

• cpe:2.3:a:clusterlabs:pacemaker:1.1.2:*:*:*:*:*:*:*
• cpe:2.3:a:clusterlabs:pacemaker:1.1.6:*:*:*:*:*:*:*
• cpe:2.3:a:clusterlabs:pacemaker:1.1.6.1:*:*:*:*:*:*:*

External links

https://bugzilla.redhat.com/show_bug.cgi?id=1888191
https://lists.clusterlabs.org/pipermail/users/2020-October/027840.html
https://seclists.org/oss-sec/2020/q4/83

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.