ICS Advisory (ICSA-20-140-01)

Rockwell Automation EDS Subsystem

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1. EXECUTIVE SUMMARY

  • CVSS v3 8.2
  • ATTENTION: Exploitable from adjacent network/low skill level to exploit
  • Vendor: Rockwell Automation
  • Equipment: EDS Subsystem
  • Vulnerabilities: Improper Restriction of Operations within the Bounds of a Memory Buffer, SQL Injection

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could lead to a denial-of-service condition.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following products that utilize the EDS Subsystem (Version 28.0.1 and prior) are affected:

  • FactoryTalk Linx software (Previously called RSLinx Enterprise): Versions 6.00, 6.10, and 6.11
  • RSLinx Classic: Version 4.11.00 and prior
  • RSNetWorx software: Version 28.00.00 and prior
  • Studio 5000 Logix Designer software: Version 32 and prior

3.2 VULNERABILITY OVERVIEW

3.2.1    IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119

A memory corruption vulnerability exists in the algorithm that matches square brackets in the EDS subsystem. This may allow an attacker to craft specialized EDS files to crash the EDSParser COM object, leading to denial-of-service conditions.

CVE-2020-12038 has been assigned to this vulnerability. A CVSS v3 base score of 6.7 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:H).

3.2.2    IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN AN SQL COMMAND ('SQL INJECTION') CWE-89

The EDS subsystem does not provide adequate input sanitization, which may allow an attacker to craft specialized EDS files to inject SQL queries and manipulate the database storing the EDS files. This may lead to denial-of-service (DoS) conditions or allow an attacker to manipulate the SQL engine to write or modify files on the system.

CVE-2020-12034 has been assigned to this vulnerability. A CVSS v3 base score of 8.2 has been calculated; the CVSS vector string is (AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H).

3.3 BACKGROUND

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

3.4 RESEARCHER

Sharon Brizinov and Amir Preminger (VP Research) of Claroty reported these vulnerabilities to Rockwell Automation and CISA.

4. MITIGATIONS

Rockwell Automation recommends the following:

  • Apply patch by following the instructions in knowledgebase article RAid 1125928 (login required).

Network-based vulnerability mitigations for embedded products:

  • Block all traffic to EtherNet/IP or other CIP protocol-based devices from outside the manufacturing zone by blocking or restricting access to TCP Ports 2222, 7153 and UDP Port 44818 using proper network infrastructure controls, such as firewalls, UTM devices, or other security appliances. For more information on TCP/UDP ports used by Rockwell Automation products, see Knowledgebase Article ID 898270

General mitigations:

  • Locate control system networks and 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.

For more information please refer to Rockwell Automation’s security advisory 54102-Industrial Security Advisory Index.
CISA recommends users take the following measures to protect themselves from social engineering attacks:

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

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