ICS Advisory (ICSA-22-167-03)

AutomationDirect DirectLOGIC with Ethernet

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1. EXECUTIVE SUMMARY

  • CVSS v3 7.5
  • ATTENTION: Exploitable remotely/low attack complexity
  • Vendor: AutomationDirect
  • Equipment: DirectLOGIC with Ethernet Communication Modules
  • Vulnerabilities: Uncontrolled Resource Consumption, Cleartext Transmission of Sensitive Information

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could cause a loss of sensitive information, unauthorized changes, and a denial-of-service condition.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of DirectLOGIC with Ethernet communication modules, a PLC Ethernet module, are affected:

  • All versions of H0-ECOM and H0-ECOM100 when installed in the following D0-06 series CPUs versions prior to v2.72:
    • D0-06DD1
    • D0-06DD2
    • D0-06DR
    • D0-06DA
    • D0-06AR
    • D0-06AA
    • D0-06DD1-D
    • D0-06DD2-D
    • D0-06DR-D

3.2 VULNERABILITY OVERVIEW

3.2.1    UNCONTROLLED RESOURCE CONSUMPTION CWE-400

A specially crafted packet can be sent continuously to the PLC to prevent access from DirectSoft and other devices, causing a denial-of-service condition.

CVE-2022-2004 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

3.2.2    CLEARTEXT TRANSMISSION OF SENSITIVE INFORMATION CWE-319

The product is vulnerable to a specifically crafted Ethernet packet that will cause the PLC to respond with the PLC password in cleartext. This could allow an attacker to access the system and make unauthorized changes.

CVE-2022-2003 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

3.3 BACKGROUND

  • CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors
  • COUNTRIES/AREAS DEPLOYED: Worldwide
  • COMPANY HEADQUARTERS LOCATION: United States

3.4 RESEARCHER

Sam Hanson of Dragos reported these vulnerabilities to CISA.

4. MITIGATIONS

AutomationDirect recommends users upgrade to firmware Version 2.72 or later for all DL06 CPUs for CVE-2022-2002.

Additional brute force mitigation for password access has also been added. Three incorrect password entries will result in a three hour lock out of password entry. Power cycle will allow subsequent password attempts.

Please see the security network practices below for CVE-2022-2004.
While automation networks and systems have built-in password protection schemes, this is only one step in securing the affected systems. Automation control system networks must incorporate data protection and security measures at least as robust as a typical business computer system. AutomationDirect recommends users of PLCs, HMI products, and other SCADA system products perform independent network security analysis to determine the proper level of security required for the application.

AutomationDirect has identified the specific mitigation actions listed below:

  • Secure physical access.
  • Isolate and air gap networks when possible.
  • Consider some of the AutomationDirect newer PLC families.

Please refer to the following link for supporting information related to security considerations.

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 cisa.gov/ics 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 cisa.gov/ics 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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