1. EXECUTIVE SUMMARY
- CVSS v3 7.5
- ATTENTION: Exploitable remotely/low skill level to exploit
- Vendor: GE/Emerson
- Equipment: PACSystems RX3i
- Vulnerability: Improper Input Validation
2. RISK EVALUATION
Successful exploitation of this vulnerability could cause the system to change to halt-mode, resulting in a denial-of-service condition.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Emerson reports this vulnerability affects the following GE PACSystem products and versions:
- CPE100: All versions prior to R9.85
- CPE115: All versions prior to R9.85
- CPE302: All versions prior to R9.90
- CPE305: All versions prior to R9.90
- CPE310: All versions prior to R9.90
- CRU320: (End of Life; Upgrade to CPE330)
- CPE330: All versions prior to R9.90
- CPE400: All versions prior to R9.90
- CPL410: All versions prior to R9.90
3.2 VULNERABILITY OVERVIEW
Sending specially manipulated packets can cause the module state to change to halt-mode, resulting in a denial-of-service condition. An operator must reboot the CPU module after removing battery or energy pack to recover from halt-mode.
- CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Critical Manufacturing, Dams, Defense Industrial Base, Energy, Food and Agricultural, Government Facilities, Information Technology, Transportation Systems, Water and Wastewater Systems
- COUNTRIES/AREAS DEPLOYED: Worldwide
- COMPANY HEADQUARTERS LOCATION: United States
Jin Kyung Lee and Yeop Chang of NSR (National Security Research Institute) reported this vulnerability to CISA.
Emerson recommends users upgrade to the following versions:
- Version R9.85
- Version R9.90
- CPE302 – Upgrade Kit: CPE302_FW9_90_41G2552-FW01-000-A3.zip
- CPE305 – Upgrade Kit: CPE305_FW9_90_41G1733-MS10-000-A20.zip
- CPE310 – Upgrade Kit: CPE310_FW9_90_41G1734-MS10-000-A20.zip
- CPE330 – Upgrade Kit: CPE330_FW9_90_41G2016-FW01-000-A16.zip
- CPE400 – Upgrade Kit: CPE400_FW9_90_41G2376-FW01-000-A7.zip
- CPL410 – Upgrade Kit: CPL410_FW9_90_41G2617-FW01-000-A3.zip
- Emerson notes that CPU/CRU320 has reached end of life. They recommend users upgrade to CPE330.
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
- Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet.
- Locate control system networks and remote devices behind firewalls, and isolate them from the business network.
- When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on us-cert.gov. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage on us-cert.gov in the Technical Information Paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents.
No known public exploits specifically target this vulnerability.