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U.S. Department of Homeland Security Seal. ICS-CERT. Industrial Control Systems Cyber Emergency Response Team.
TLP:WHITE

Advisory (ICSA-18-137-01)

GE PACSystems CPE305/310, CPE330, CPE400, RSTi-EP CPE 100, CPU320/CRU320, RXi

Original release date: May 17, 2018 | Last revised: May 21, 2018

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1. EXECUTIVE SUMMARY

  • CVSS v3 7.5
  • ATTENTION: Exploitable remotely/low skill level to exploit
  • Vendor: GE
  • Equipment: PACSystems CPE305/310, CPE330, CPE400, RSTi-EP CPE 100, CPU320/CRU320, RXi
  • Vulnerability: Improper Input Validation

2. RISK EVALUATION

Successful exploitation of this vulnerability could cause the device to reboot and change its state, causing the device to become unavailable.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of PACSystems, an industrial Internet controller, are affected:

  • PACSystems RX3i CPE305/310 version 9.20 and prior,
  • RX3i CPE330 version 9.21 and prior,
  • RX3i CPE 400 version 9.30 and prior,
  • PACSystems RSTi-EP CPE 100 all versions, and
  • PACSystems CPU320/CRU320 and RXi all versions.

3.2 VULNERABILITY OVERVIEW

3.2.1 IMPROPER INPUT VALIDATION CWE-20

The device does not properly validate input, which could allow a remote attacker to send specially crafted packets causing the device to become unavailable.

CVE-2018-8867 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

3.3 BACKGROUND

  • Critical Infrastructure Sectors: Critical Manufacturing
  • Countries/Areas Deployed: Worldwide
  • Company Headquarters Location: USA

3.4 RESEARCHER

Younes Dragoni of Nozomi Networks reported the vulnerability to NCCIC.

4. MITIGATIONS

GE has released the following firmware to mitigate the vulnerability (login required):

IC695CPE305 – https://digitalsupport.ge.com/communities/en_US/Download/IC695CPE305-PACSystems-RX3i-CPU-DNUpgrade Kit: CPE305_FW9_40_41G1733-MS10-000-A17.zip

IC695CPE310 – https://digitalsupport.ge.com/communities/en_US/Download/IC695CPE310-PACSystems-RX3i-CPU-DNUpgrade Kit: CPE310_FW9_40_41G1734-MS10-000-A17.zip

IC695CPE330 – https://digitalsupport.ge.com/communities/en_US/Download/IC695CPE330-PACSystems-RX3i-CPU-DNUpgrade Kit: CPE330_FW9_40_41G2016-FW01-000-A11.zip

IC695CPE400 – https://digitalsupport.ge.com/communities/en_US/Download/IC695CPE400-PACSystems-RX3i-Rackless-CPU-with-Field-AgentUpgrade Kit: CPE400_FW9_40_41G2376-FW01-000-A3.zip

For CPE100 the newest firmware can be obtained through the following link:

https://digitalsupport.ge.com/communities/en_US/Download/EPSCPE100-RSTi-EP-CPU-Firmware

GE reports that CPU/CRU320 is end of life, and there is a direct upgrade path available to users.

NCCIC 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.

NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

NCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. 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-CERT website 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 NCCIC for tracking and correlation against other incidents.

NCCIC also recommends that users take the following measures to protect themselves from social engineering attacks:

No known public exploits specifically target this vulnerability.


Contact Information

For any questions related to this report, please contact the NCCIC at:

Email: NCCICCUSTOMERSERVICE@hq.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:  http://ics-cert.us-cert.gov 
or incident reporting:  https://ics-cert.us-cert.gov/Report-Incident?

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