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CVE-2026-25872 - Larvicidal Misalignment

Description

JUNG Smart Panel KNX firmware version L1.12.22 and prior contain an unauthenticated path traversal vulnerability in the embedded web interface. The application fails to properly validate file path input, allowing remote, unauthenticated attackers to access arbitrary files on the underlying filesystem within the context of the web server. This may result in disclosure of system configuration files and other sensitive information.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Reference

https://downloads.jung.de/public/en/pdf/productdocumentation/en_sp5.1knx_09012015.pdf https://www.jung-group.com/ https://www.vulncheck.com/advisories/jung-smart-panel-knx-unauthenticated-path-traversal https://www.zeroscience.mk/en/vulnerabilities/ZSL-2026-5969.php

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

Base Score

5.3

Base Severity

MEDIUM

Remediation Step-by-Step Guide

  1. Identify Affected Devices
    • Inventory all JUNG Smart Panel KNX devices running firmware version L1.12.22 or earlier.
    • Use network scanning tools (e.g., Nmap, KNX IP Router utilities) to detect devices and verify firmware versions.
  2. Apply Vendor Patch
    • Contact JUNG Technologies or visit their official support portal to obtain the latest patched firmware.
    • Download and verify the integrity of the update file using provided checksums (SHA-256 or similar).
  3. Schedule Maintenance Window
    • Plan a maintenance window during non-operational hours to minimize disruption to building automation systems.
  4. Backup Configuration
    • Export and securely store current device configurations (e.g., KNX group addresses, user settings) before upgrading.
  5. Perform Firmware Update
    • Access the device’s web interface via a secure, isolated management network.
    • Upload and install the updated firmware using the official update procedure documented by JUNG.
  6. Validate Patch Application
    • Confirm firmware version post-update is L1.12.23 or later.
    • Test the web interface for path traversal by attempting to access /etc/passwd, /config/, or similar paths — these should now return 403 Forbidden or be blocked.
  7. Restrict Network Access
    • Configure firewalls to restrict access to the device’s web interface to trusted IP ranges only.
    • Disable internet-facing exposure of KNX devices; use a DMZ or VLAN segmentation if remote access is required.
  8. Enable Logging and Monitoring
    • Enable web server access logs on the device (if supported).
    • Forward logs to a SIEM system and create alerts for suspicious file path requests (e.g., ../ sequences).
  9. Document and Review
    • Update asset inventory with new firmware version and patch date.
    • Conduct a post-remediation review to ensure no residual exposure exists.

Context within ISO/IEC 27001 and NIST Frameworks

ISO/IEC 27001 Controls

This vulnerability directly impacts the following controls from Annex A of ISO/IEC 27001:

  • A.9.4.1 – Access control to operating systems — Unauthenticated access to filesystems violates the principle of least privilege and secure authentication.
  • A.12.3.1 – Management of technical vulnerabilities — Failure to patch known path traversal flaws breaches the requirement for timely vulnerability management.
  • A.12.6.1 – Technical vulnerability management — The absence of a process to identify and remediate unauthenticated file access flaws is a control failure.
  • A.13.2.1 – Information transfer policies — Exposed configuration files may contain sensitive system details, violating data confidentiality requirements under A.8.1.

NIST SP 800-53 Controls

This vulnerability maps to the following NIST controls:

  • SI-2 – System and Communications Protection — Specifically SI-2(10): “The organization implements automated mechanisms to detect and prevent path traversal attacks.”
  • SI-3 – Vulnerability Scanning — Lack of scanning for known path traversal flaws violates SI-3(1) and SI-3(2).
  • AU-6 – Audit Log Monitoring — Inadequate logging of file access attempts prevents detection (AU-6(1)).
  • CM-7 – Least Privilege — The web server process must not have unrestricted filesystem access; privilege escalation via path traversal breaches CM-7.
  • RA-5 – Risk Assessment — Failure to assess and mitigate unauthenticated access risks violates RA-5(1) and RA-5(2).

Recommendation: Integrate this vulnerability into the organization’s risk register under ISO/IEC 27001 A.9 and NIST SI-2, CM-7, and RA-5 controls; implement automated patching workflows and network segmentation to align with both frameworks.