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 3. Cybersecurity Advisories
 4. ICS Advisory

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ICS Advisory


ROCKWELL AUTOMATION COMPACTLOGIX 5370 AND CONTROLLOGIX 5570 CONTROLLERS (UPDATE
A)

Last Revised
March 23, 2021
Alert Code
ICSA-21-061-02



1. EXECUTIVE SUMMARY

 * CVSS v3 5.8
 * ATTENTION: Exploitable remotely/low skill level to exploit
 * Vendor: Rockwell Automation
 * Equipment: CompactLogix and ControlLogix controllers
 * Vulnerability: Improper Input Validation


2. UPDATE INFORMATION

This updated advisory is a follow-up to the original advisory titled
ICSA-21-061-02 Rockwell Automation CompactLogix 5370 and ControlLogix 5570
Controllers that was published March 2, 2021, to the ICS webpage on
us-cert.cisa.gov.


3. RISK EVALUATION

Successful exploitation of this vulnerability may allow an attacker to send
specially crafted CIP packet requests to a controller, which may cause
denial-of-service conditions in communications with other products.


4. TECHNICAL DETAILS


4.1 AFFECTED PRODUCTS

The following versions of Rockwell Automation devices are affected:

 * Armor Compact GuardLogix 5370 controllers, Versions 33 and prior
 * Armor GuardLogix, Safety Controllers, Versions 33 and prior
 * CompactLogix 5370 L1 controllers, Versions 33 and prior
 * CompactLogix 5370 L2 controllers, Versions 33 and prior
 * CompactLogix 5370 L3 controllers, Versions 33 and prior
 * Compact GuardLogix 5370 controllers, Versions 33 and prior
 * ControlLogix 5570 controllers, Versions 33 and prior


4.2 VULNERABILITY OVERVIEW

4.2.1    IMPROPER INPUT VALIDATION CWE-22(LINK IS EXTERNAL)

The connection establishment algorithm found in CompactLogix 5370 and
ControlLogix 5570 does not sufficiently manage its control flow during
execution, creating an infinite loop. This may allow an attacker to send
specially crafted CIP packet requests to a controller, which may cause
denial-of-service conditions in communications with other products.

CVE-2020-6998 has been assigned to this vulnerability. A CVSS v3 base score of
5.8 has been assigned; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L(link is external)).


4.3 BACKGROUND

 * CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
 * COUNTRIES/AREAS DEPLOYED: Worldwide
 * COMPANY HEADQUARTERS LOCATION: United States


4.4 RESEARCHER

Yeop Chang reported this vulnerability to CISA.


5. MITIGATIONS

Rockwell Automation recommends affected users apply firmware v33.011 or
later(link is external).

--------- Begin Update A Part 1 of 1 ---------

For more information see the Rockwell Automation advisory(link is external)
(login required).

--------- End Update A Part 1 of 1 ---------

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 VPNs may have vulnerabilities and should be
   updated to the most current version available. Also recognize 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.cisa.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.cisa.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.


VENDOR

Rockwell Automation


PLEASE SHARE YOUR THOUGHTS

We recently updated our anonymous product survey; we’d welcome your feedback.


RELATED ADVISORIES

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ICS Advisory | ICSA-23-152-01


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ICS Advisory | ICSA-23-152-02


HID GLOBAL SAFE

May 30, 2023
ICS Advisory | ICSA-23-150-01


ADVANTECH WEBACCESS/SCADA

May 25, 2023
ICS Advisory | ICSA-23-145-01


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