CVE-2020-25654

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-11-24 · updated 2026-06-17
Weakness: CWE-284

Description

An ACL bypass flaw was found in pacemaker. An attacker having a local account on the cluster and in the haclient group could 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.

Affected products

ClusterLabs pacemaker: before 1.1.23; from 2.0.0 before 2.0.3; 2.0.5-rc1 — fixed in 1.1.23, 2.0.3
Debian Linux: 9.0

How to fix

Upgrade to a fixed version: ClusterLabs pacemaker 1.1.23, 2.0.3. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1888191
https://lists.clusterlabs.org/pipermail/users/2020-October/027840.html
https://lists.debian.org/debian-lts-announce/2021/01/msg00007.html
https://seclists.org/oss-sec/2020/q4/83
https://security.gentoo.org/glsa/202309-09
https://bugzilla.redhat.com/show_bug.cgi?id=1888191
https://lists.clusterlabs.org/pipermail/users/2020-October/027840.html
https://lists.debian.org/debian-lts-announce/2021/01/msg00007.html
https://seclists.org/oss-sec/2020/q4/83
https://security.gentoo.org/glsa/202309-09

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