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AUSCERT External Security Bulletin Redistribution
ESB-2021.0260
Advisory (icsa-21-021-03) Honeywell OPC UA Tunneller
22 January 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Honeywell OPC UA Tunneller
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-27299 CVE-2020-27297 CVE-2020-27295
CVE-2020-27274
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-021-03
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ICS Advisory (ICSA-21-021-03)
Honeywell OPC UA Tunneller
Original release date: January 21, 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 9.8
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Matrikon, a subsidiary of Honeywell
o Equipment: OPC UA Tunneller
o Vulnerabilities: Heap-based Buffer Overflow, Out-of-bounds Read, Improper
Check for Unusual or Exceptional Conditions, Uncontrolled Resource
Consumption
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
disclose sensitive information, remotely execute arbitrary code, or crash the
device.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Honeywell reports the vulnerabilities affect the following Matrikon products:
o OPC UA Tunneller: All versions prior to 6.3.0.8233
3.2 VULNERABILITY OVERVIEW
3.2.1 HEAP-BASED BUFFER OVERFLOW CWE-122
The affected product is vulnerable to a heap-based buffer overflow, which may
allow an attacker to manipulate memory with controlled values and remotely
execute code.
CVE-2020-27297 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
3.2.2 OUT-OF-BOUNDS READ CWE-125
The affected product is vulnerable to an out-of-bounds read, which may allow an
attacker to obtain and disclose sensitive data information or cause the device
to crash.
CVE-2020-27299 has been assigned to this vulnerability. A CVSS v3 base score of
8.2 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:L/A:N ).
3.2.3 IMPROPER CHECK FOR UNUSUAL OR EXCEPTIONAL CONDITIONS CWE-754
Some parsing functions in the affected product do not check the return value of
malloc and the thread handling the message is forced to close, which may lead
to a denial-of-service condition.
CVE-2020-27274 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 ).
3.2.4 UNCONTROLLED RESOURCE CONSUMPTION CWE-400
The affected product has uncontrolled resource consumption issues, which may
allow an attacker to cause a denial-of-service condition.
CVE-2020-27295 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 Sectors
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Canada
3.4 RESEARCHER
Uri Katz of Claroty reported these vulnerabilities to CISA.
4. MITIGATIONS
Honeywell recommends upgrading Matrikon OPC UA Tunneller to Version 6.3.0.8233
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 that they are not accessible from the Internet .
o Locate control system networks and remote 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), recognizing that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that 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 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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