CVE-2024-43812 Kieback&Peter CVE debrief

Who should care

Organizations operating building automation systems, facility management teams, critical infrastructure operators with HVAC and environmental controls, OT security teams, and asset owners in commercial real estate, healthcare, and industrial facilities using Kieback&Peter DDC controllers.

Technical summary

The vulnerability stems from insufficient protection of credential storage in the DDC4000 series firmware. An attacker with local access to the controller's file system can read /etc/passwd without authentication, obtaining password hashes for all system users. This enables offline hash cracking attacks against administrative and service accounts. The attack requires local access (AV:L) but no privileges (PR:N) and has low complexity (AC:L). Legacy controllers in the series have reached end-of-life status and will not receive patches; organizations must rely on network segmentation and operational technology security best practices for these devices. Current-generation controllers have patched firmware available (v1.21.0+).

Defensive priority

HIGH

Recommended defensive actions

• Identify all Kieback&Peter DDC4000 series controllers in your environment and document their firmware versions
• For legacy DDC4002, DDC4100, DDC4200, DDC4200-L, and DDC4400 controllers (EOL, no patches): isolate on strictly segmented OT networks with no internet access, disable unnecessary services, and plan migration to supported
• For DDC4002e, DDC4200e, DDC4400e, DDC4020e, and DDC4040e controllers: contact your local Kieback&Peter office to schedule firmware update to v1.21.0 or later
• Review and rotate any credentials that may have been exposed through this vulnerability
• Apply defense-in-depth controls per CISA ICS recommended practices including network segmentation, monitoring, and least-privilege access
• Monitor for unauthorized access attempts to controller file systems or authentication services

Evidence notes

CISA CSAF advisory ICSA-24-291-05 published 2024-10-17T06:00:00Z. CVSS 3.1 vector: AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Affected product list and remediation guidance extracted from CSAF product tree and remediation sections.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.