ICS Advisory (ICSA-20-175-02)

Honeywell ControlEdge PLC and RTU

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1. EXECUTIVE SUMMARY

  • CVSS v3 5.9
  • ATTENTION: Remotely exploitable/low skill level to exploit
  • Vendor: Honeywell
  • Equipment: ControlEdge PLC and RTU
  • Vulnerabilities: Cleartext Transmission of Sensitive Information

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow an attacker to obtain passwords and session tokens.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of ControlEdge PLC and RTU, are affected:

  • ControlEdge PLC R130.2, R140, R150, and R151
  • ControlEdge RTU R101, R110, R140, R150, and R151

3.2 VULNERABILITY OVERVIEW

3.2.1    CLEARTEXT TRANSMISSION OF SENSITIVE INFORMATION CWE-319

The affected device exposes unencrypted passwords on the network.

CVE-2020-10628 has been assigned to this vulnerability. A CVSS v3 base score of 5.9 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).

3.2.2    CLEARTEXT TRANSMISSION OF SENSITIVE INFORMATION CWE-319

The affected product exposes a session token on the network.

CVE-2020-10624 has been assigned to this vulnerability. A CVSS v3 base score of 5.9 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).

3.3 BACKGROUND

  • CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy, Water and Wastewater Systems
  • COUNTRIES/AREAS DEPLOYED: Worldwide
  • COMPANY HEADQUARTERS LOCATION: United States

3.4 RESEARCHER

Nikolay Sklyarenko of Kaspersky reported these vulnerabilities to Honeywell.

4. MITIGATIONS

Honeywell provided detailed information for mitigation on the insecure communication in Control Edge PLC\RTU. Please access the support document SN2020-04-17-01-ConotrolEdge-PLC-and- and-RTU-Secure-Communication (login required). Download this document and follow the step by step instructions. The user must be logged in to access the security notification.

Users who have difficulty accessing the document can contact Honeywell support.

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 these vulnerabilities.


Contact Information

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

Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:  https://us-cert.cisa.gov/ics 
or incident reporting:  https://us-cert.cisa.gov/report

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