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AUSCERT External Security Bulletin Redistribution
ESB-2024.2370
ICS Advisory | ICSA-24-107-03 Rockwell Automation ControlLogix and
GuardLogix
17 April 2024
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AusCERT Security Bulletin Summary
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Product: Rockwell Automation ControlLogix and GuardLogix
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2024-3493
Original Bulletin:
https://www.cisa.gov/news-events/ics-advisories/icsa-24-107-03
Comment: CVSS (Max): 8.6 CVE-2024-3493 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
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ICS Advisory (ICSA-24-107-03)
Rockwell Automation ControlLogix and GuardLogix
Release Date
April 16, 2024
1. EXECUTIVE SUMMARY
o CVSS v4 9.2
o ATTENTION : Exploitable remotely/low attack complexity
o Vendor : Rockwell Automation
o Equipment : ControlLogix 5580, GuardLogix 5580, CompactLogix 5380,
1756-EN4TR
o 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:
o ControlLogix 5580: Version V35.011
o GuardLogix 5580: Version V35.011
o CompactLogix 5380: Version V35.011
o 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
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o 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:
o ControlLogix 5580: Update to version V35.013 or V36.011
o GuardLogix 5580: Update to version V35.013 or V36.011
o CompactLogix 5380: Update to version V35.013 or V36.011
o 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:
o Minimize network exposure for all control system devices and/or systems,
ensuring they are not accessible from the internet .
o Locate control system networks and remote devices behind firewalls and
isolating them from business networks.
o 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
o April 16, 2024: Initial Publication
This product is provided subject to this Notification and this Privacy & Use
policy.
Vendor
Rockwell Automation
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