ICS Advisory (ICSA-20-051-02)

Rockwell Automation FactoryTalk Diagnostics

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1. EXECUTIVE SUMMARY

  • CVSS v3 9.8
  • ATTENTION: Exploitable remotely/low skill level to exploit
  • Vendor: Rockwell Automation
  • Equipment: FactoryTalk Diagnostics
  • Vulnerability: Deserialization of Untrusted Data

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow a remote unauthenticated attacker to execute arbitrary code with SYSTEM level privileges.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

  • All versions of FactoryTalk Diagnostics software, a subsystem of the FactoryTalk Services Platform, are affected.

3.2 VULNERABILITY OVERVIEW

3.2.1    DESERIALIZATION OF UNTRUSTED DATA CWE-502

Factory Talk Diagnostics exposes a .NET Remoting endpoint via RNADiagnosticsSrv.exe at TCPtcp/8082, which can insecurely deserialize untrusted data.

CVE-2020-6967 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

3.3 BACKGROUND

  • CRITICAL INFRASTRUCTURE SECTORS: Food and Agriculture, Transportation Systems, Water and Wastewater Systems
  • COUNTRIES/AREAS DEPLOYED: Worldwide
  • COMPANY HEADQUARTERS LOCATION: United States

3.4 RESEARCHER

Trend Micro’s Zero Day Initiative, working with rgod of 9sg, reported this vulnerability to CISA.

4. MITIGATIONS

Rockwell Automation is currently working to develop updated software that addresses the reported vulnerability. Rockwell Automation recommends affected users implement the following compensating controls, based on their needs:

  • Disable the Remote Diagnostics Service if not in use.
  • If the service is in use, use Windows Firewall Configuration to disable the affected port.

For more information, please see Rockwell Automation’s security advisory (login required).

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.


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://www.us-cert.gov/ics 
or incident reporting:  https://www.us-cert.gov/report

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