Security readout for executives and security teams
Plain-English summary
Pacemaker had an authorization bypass where a cluster user in the haclient group could talk directly to cluster daemons and perform actions that ACLs should block. The issue is most relevant where multiple local users can access cluster nodes or cluster accounts.
Executive priority
Prioritize remediation for production high-availability clusters, especially shared or multi-admin environments. The issue is not shown as remotely exploitable or actively exploited, but it can weaken operational controls around critical cluster infrastructure.
Technical view
CVE-2020-25654 is a CWE-284 improper access control flaw in pacemaker. The described path is direct IPC communication with daemons, bypassing configuration-path ACL enforcement. Sources identify pacemaker 1.1.24-rc1 and 2.0.5-rc2 context, but the supplied data does not provide CVSS or complete affected-version ranges.
Likely exposure
Exposure is limited to systems running pacemaker where an attacker already has a local account on a cluster node and membership in the haclient group. Internet-only exposure is not supported by the sources.
Exploitation context
The supplied sources do not show active exploitation, and CISA KEV status is false. Exploitation requires authenticated local cluster access, but successful abuse could undermine intended cluster administration boundaries.
Researcher notes
Key evidence is the CVE description and oss-sec/vendor advisory references. The source bundle lacks CVSS, exploit evidence, and complete fixed-version detail, so validation should rely on distribution advisories and local package metadata.
Mitigation direction
- Apply pacemaker security updates from the operating system or vendor advisory channel.
- Review vendor guidance for fixed versions and distribution-specific package names.
- Restrict local accounts on cluster nodes to trusted administrators.
- Audit haclient group membership and remove unnecessary users.
- Review cluster ACL assumptions for users with daemon IPC access.
Validation and detection
- Inventory pacemaker installations and package versions on all cluster nodes.
- Check whether local users outside cluster administrators belong to haclient.
- Confirm installed packages include vendor security updates for CVE-2020-25654.
- Review authentication and ACL design for cluster-management workflows.
- Check security monitoring for unexpected local cluster administration activity.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2020-25654 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://bugzilla.redhat.com/show_bug.cgi?id=1888191CVE reference
- https://seclists.org/oss-sec/2020/q4/83CVE reference
- https://lists.clusterlabs.org/pipermail/users/2020-October/027840.htmlCVE reference
- [debian-lts-announce] 20210106 [SECURITY] [DLA 2519-1] pacemaker security updateCVE reference · mailing-list
- GLSA-202309-09CVE reference · vendor-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.