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AUSCERT External Security Bulletin Redistribution
ESB-2021.0327
Advisory (icsa-21-028-01) Rockwell Automation FactoryTalk
Linx and FactoryTalk Services Platform
29 January 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Rockwell Automation FactoryTalk Linx and FactoryTalk Services Platform
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2020-5807 CVE-2020-5806 CVE-2020-5802
CVE-2020-5801
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-028-01
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ICS Advisory (ICSA-21-028-01)
Rockwell Automation FactoryTalk Linx and FactoryTalk Services Platform
Original release date: January 28, 2021
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 skill level to exploit
o Vendor: Rockwell Automation
o Equipment: FactoryTalk Linx and FactoryTalk Services Platform
o Vulnerabilities: Classic Buffer overflow, Improper Check or Handling of
Exceptional Conditions
2. RISK EVALUATION
Successful exploitation of these vulnerabilities may result in
denial-of-service conditions.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Rockwell Automation reports these vulnerabilities affect the following
products:
o FactoryTalk Linx software: Versions 6.20 and prior (CVE-2020-5806 only
affects Versions 6.10, 6.11, and 6.20)
o FactoryTalkServices Platform: Versions 6.20 and prior (Only affected by
CVE-2020-5807)
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER CHECK OR HANDLING OF EXCEPTIONAL CONDITIONS CWE-703
Unhandled exception vulnerabilities exist within a .dll in FactoryTalk Linx.
These vulnerabilities could allow a remote, unauthenticated attacker to send a
malicious packet resulting in the termination of RSLinxNG.exe, causing a
denial-of-service condition.
CVE-2020-5801 and CVE-2020-5802 have been assigned to these vulnerabilities. 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 ).
3.2.2 BUFFER COPY WITHOUT CHECKING SIZE OF INPUT CWE-120
A buffer overflow vulnerability exists within a .dll in FactoryTalk Linx. This
vulnerability could allow a local, unauthenticated attacker to send a malicious
packet resulting in the termination of RSLinxNG.exe, causing a
denial-of-service condition.
CVE-2020-5806 has been assigned to this vulnerability. A CVSS v3 base score of
6.2 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:N/S:U/
C:N/I:N/A:H ).
3.2.3 BUFFER COPY WITHOUT CHECKING SIZE OF INPUT CWE-120
A buffer overflow vulnerability exists within a .dll in FactoryTalk Services
Platform. This vulnerability could be exploited via a phishing attack where an
attacker sends a specially crafted log file to a local user. When the malicious
log file is opened by a local user, it can cause a buffer overflow in the
FactoryTalk Services Platform resulting in temporary denial-of-service
conditions. Users can recover from the condition by reopening the impacted
software.
CVE-2020-5806 has been assigned to this vulnerability. A CVSS v3 base score of
4.3 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:R/S:U/
C:N/I:N/A:L ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: United States
3.4 RESEARCHER
Tenable reported these vulnerabilities to Rockwell Automation.
4. MITIGATIONS
Rockwell Automation published PN1540 to inform users of the risk of these
vulnerabilities and instruct users on the proper use of patches.
Rockwell Automation recommends the following network-based vulnerability
mitigations for embedded products:
o Utilize proper network infrastructure controls, such as firewalls, to help
ensure traffic from unauthorized sources is blocked.
o Consult the product documentation for specific features, such as a hardware
keyswitch setting, which may be used to block unauthorized changes, etc.
o Block all traffic to EtherNet/IP or other CIP protocol-based devices from
outside the manufacturing zone by blocking or restricting access to TCP and
UDP Port 2222 and 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 BF7490 .
Rockwell Automation recommends the following software/PC-based mitigation
strategies:
o Run all software as a User, not as an Administrator, to minimize the impact
of malicious code on the infected system.
o Use Microsoft AppLocker or other similar allow list applications to help
mitigate risk. Information on using AppLocker with Rockwell Automation
products is available at Knowledgebase Article ID QA17329 .
o Confirm the least-privilege user principle is followed and the user/service
account access to shared resources (such as a database) is only granted
with a minimum number of rights as needed.
Rockwell Automation recommends the following social engineering mitigation
strategies:
o Do not open untrusted .ftd files with FactoryTalk Services Platform.
o Do not click on or open URL links from untrusted sources.
o Employ training and awareness programs to educate users on the warning
signs of a phishing or social engineering attack.
Rockwell Automation recommends the following general mitigations:
o Use trusted software, software patches, antivirus/antimalware programs and
interact only with trusted websites and attachments.
o Minimize network exposure for all control system devices and/or systems and
ensure they are not accessible from the Internet. For further information
about the risks of unprotected Internet accessible control systems, please
see Knowledgebase Article ID PN715 .
o Locate control system networks and devices behind firewalls and isolate
them from the business network.
o When remote access is required, use secure methods, such as virtual private
networks (VPNs), and recognize VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize a VPN is only
as secure as the connected devices.
CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities.
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 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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===========================================================================
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