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1. EXECUTIVE SUMMARY

CVSS v4 9.2
ATTENTION: Exploitable remotely/low attack complexity
Vendor: Rockwell Automation
Equipment: ControlLogix 5580, GuardLogix 5580, CompactLogix 5380, 1756-EN4TR
Vulnerability: Improper Input Validation

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker to cause a major nonrecoverable fault (MNRF) resulting in the product to become unavailable.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Rockwell Automation ControlLogix and GuardLogix, programmable logic controllers, are affected:

ControlLogix 5580: Version V35.011
GuardLogix 5580: Version V35.011
CompactLogix 5380: Version V35.011
1756-EN4TR: Version V5.001

3.2 Vulnerability Overview

3.2.1 IMPROPER INPUT VALIDATION CWE-20

A specific malformed fragmented packet type (fragmented packets may be generated automatically by devices that send large amounts of data) can cause a major nonrecoverable fault (MNRF). If exploited, the affected product will become unavailable and require a manual restart to recover it. Additionally, a MNRF could result in a loss of view and/or control of connected devices.

CVE-2024-3493 has been assigned to this vulnerability. A CVSS v3.1 base score of 8.6 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H).

A CVSS v4 score has also been calculated for CVE-2024-3493. A base score of 9.2 has been calculated; the CVSS vector string is (CVSS4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H).

3.3 BACKGROUND

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

3.4 RESEARCHER

Rockwell Automation reported this vulnerability to CISA.

4. MITIGATIONS

Rockwell Automation has released product updates addressing this vulnerability:

ControlLogix 5580: Update to version V35.013 or V36.011
GuardLogix 5580: Update to version V35.013 or V36.011
CompactLogix 5380: Update to version V35.013 or V36.011
1756-EN4TR: Update to version V6.001

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

CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability, such as:

Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.
Locate control system networks and remote devices behind firewalls and isolating them from business networks.
When remote access is required, use more 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 cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.

Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.

No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.

5. UPDATE HISTORY

April 16, 2024: Initial Publication