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AUSCERT External Security Bulletin Redistribution
ESB-2022.6637
Advisory (icsa-22-354-04) Rockwell Automation MicroLogix 1100 and 1400
21 December 2022
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AusCERT Security Bulletin Summary
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Product: Rockwell Automation MicroLogix 1100 and 1400
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2022-46670 CVE-2022-3166
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-354-04
Comment: CVSS (Max): 7.5 CVE-2022-3166 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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ICS Advisory (ICSA-22-354-04)
Rockwell Automation MicroLogix 1100 and 1400
Original release date: December 20, 2022
Legal Notice
All information products included in https://us-cert.cisa.gov/ics are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
referenced in this product or otherwise. Further dissemination of this product
is governed by the Traffic Light Protocol (TLP) marking in the header. For more
information about TLP, see https://us-cert.cisa.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 7.5
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Rockwell Automation
o Equipment: MicroLogix 1100 and 1400
o Vulnerabilities: Cross-site Scripting, Improper Restriction of Rendered UI
Layers or Frames
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could create a
denial-of-service condition or allow for remote code execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of MicroLogix-a line of programmable logic controllers
(PLCs)-are affected:
o MicroLogix 1100: all versions
o MicroLogix 1400 A: Versions 7.000 and prior
o MicroLogix 1400 B/C: Versions 21.007 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
SCRIPTING') CWE-79
The affected products have an unauthenticated stored cross-site scripting
vulnerability in the embedded webserver. The payload is transferred to the
controller over simple network management protocol (SNMP) and is rendered on
the homepage of the embedded website. Exploitation of this vulnerability could
result in unauthenticated remote code execution.
CVE-2022-46670 has been assigned to this vulnerability. A CVSS v3 base score of
7.1 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:R/S:C/
C:L/I:L/A:L ).
3.2.2 IMPROPER RESTRICTION OF RENDERED UI LAYERS OR FRAMES CWE-1021
The affected products have a clickjacking vulnerability where an attacker with
network access to the affected systems could send TCP packets to the webserver,
closing it abruptly. This could cause a denial-of-service condition for the web
server application on the device.
CVE-2022-3166 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 ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Multiple
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: United States
3.4 RESEARCHER
Rockwell Automation reported these vulnerabilities to CISA.
4. MITIGATIONS
Rockwell Automation recommends users of the affected products to take the
following actions:
o Disable the web server, if possible (This component is an optional feature
and disabling it will not disrupt the intended use of the device)
o Configure firewalls to disallow network communication through HTTP/Port 802
o Upgrade to the MicroLogix 800 or MicroLogix 850 as this device does not
have the web server component
Rockwell Automation also recommends users to employ cybersecurity best
practices, as outlined in their Knowledgebase article .
CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls and
isolate them from business networks.
o 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 its 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 at 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 .
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 exploits specifically target these vulnerabilities.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
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