CVE-2015-5374:Vulnerability in Siemens SIPROTEC EN100 Ethernet module firmware allows a denial-of-service via specially crafted UDP packets to port 50000; affects PROFINET IO (< V1.04.01), Modbus TCP (< V1.11.00), DNP3 TCP (< V1.03), IEC 104 (< V1.21), and the EN100 module in SIPROTEC merging unit 6MU80 (< V1.02.02). A manual reboot may be required to recover the device.

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A vulnerability identified in Firmware variants for the EN100 Ethernet module could be exploited by sending specially crafted UDP packets to port 50000, causing a denial-of-service condition on the affected device. Impacted firmware variants include PROFINET IO (< 1.04.01), Modbus TCP (< 1.11.00), DNP3 TCP (< 1.03), IEC 104 (< 1.21), and the EN100 Ethernet module included in the SIPROTEC merging unit 6MU80 (< 1.02.02). Recovery may require a manual reboot to restore service. This vulnerability has been documented in Siemens security advisories and related CVE references.

Overview

This vulnerability affects Siemens SIPROTEC EN100 Ethernet module firmware across multiple protocol variants, enabling a denial-of-service condition when a printer-like sequence of UDP packets is sent to UDP port 50000. The issue results in an impact to availability, with potential need for manual reboot to restore normal operation. The advisory points to upgrades to fixed releases and mitigations to reduce exposure.

Remediation

  • Upgrade firmware to the fixed releases:
    • PROFINET IO for EN100: upgrade to V1.04.01 or later
    • Modbus TCP for EN100: upgrade to V1.11.00 or later
    • DNP3 TCP for EN100: upgrade to V1.03 or later
    • IEC 104 for EN100: upgrade to V1.21 or later
    • SIPROTEC Merging Unit 6MU80: upgrade to 1.02.02 or later
  • Apply vendor advisories and verify installation of patches corresponding to SSA-323211 and related advisories.
  • If immediate patching is not possible, implement network mitigations:
    • Block or tightly restrict UDP traffic to port 50000 to affected devices at the network edge (firewall/IPS).
    • Place affected devices behind segmentation or access control to limit exposure.
  • After upgrading, perform a reboot as instructed by the vendor and verify device availability and logging for any abnormal activity.
  • Maintain a patching schedule and monitor vendor advisories for updates or new mitigations.

References

  • Siemens Security Advisory SSA-323211.pdf: https://www.siemens.com/cert/pool/cert/siemens_security_advisory_SSA-323211.pdf
  • Siemens Security Advisory SSA-732541.pdf: http://www.siemens.com/innovation/pool/de/forschungsfelder/siemens_security_advisory_ssa-732541.pdf
  • Exploit-DB entry: 44103 — https://www.exploit-db.com/exploits/44103/
  • ICS-CERT Advisory ICSA-15-202-01: https://ics-cert.us-cert.gov/advisories/ICSA-15-202-01
  • ICS-CERT Advisory ICSA-17-187-03: https://ics-cert.us-cert.gov/advisories/ICSA-17-187-03
  • BID 75948: http://www.securityfocus.com/bid/75948

Industry ExposureMost to least
This section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.

  1. Accommodation & Food Services: Low
    Accommodation & Food Services
  2. Administrative, Support, Waste Management & Remediation Services: Low
    Administrative, Support, Waste Management & Remediation Services
  3. Agriculture, Forestry Fishing & Hunting: Low
    Agriculture, Forestry Fishing & Hunting
  4. Arts, Entertainment & Recreation: Low
    Arts, Entertainment & Recreation
  5. Construction: Low
    Construction
  6. Educational Services: Low
    Educational Services
  7. Finance and Insurance: Low
    Finance and Insurance
  8. Health Care & Social Assistance: Low
    Health Care & Social Assistance
  9. Information: Low
    Information
  10. Management of Companies & Enterprises: Low
    Management of Companies & Enterprises
  11. Manufacturing: Low
    Manufacturing
  12. Mining: Low
    Mining
  13. Other Services (except Public Administration): Low
    Other Services (except Public Administration)
  14. Professional, Scientific, & Technical Services: Low
    Professional, Scientific, & Technical Services
  15. Public Administration: Low
    Public Administration
  16. Real Estate Rental & Leasing: Low
    Real Estate Rental & Leasing
  17. Retail Trade: Low
    Retail Trade
  18. Transportation & Warehousing: Low
    Transportation & Warehousing
  19. Utilities: Low
    Utilities
  20. Wholesale Trade: Low
    Wholesale Trade

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