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AUSCERT External Security Bulletin Redistribution
ESB-2020.2582
Advisory (icsa-20-210-02) Softing Industrial Automation OPC
29 July 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Softing Industrial Automation OPC
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-14524 CVE-2020-14522
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-20-210-02
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ICS Advisory (ICSA-20-210-02)
Softing Industrial Automation OPC
Original release date: July 28, 2020
Legal Notice
All information products included in https://us-cert.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://www.us-cert.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 9.8
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Softing Industrial Automation, GmbH
o Equipment: OPC
o Vulnerabilities: Heap-based Buffer Overflow, Uncontrolled Resource
Consumption
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could crash the device being
accessed. A buffer-overflow condition may also allow remote code execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of OPC are affected:
o All versions prior to the latest build of Version 4.47.0
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 remotely execute arbitrary code.
CVE-2020-14524 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 UNCONTROLLED RESOURCE CONSUMPTION CWE-400
The affected product is vulnerable to uncontrolled resource consumption, which
may allow an attacker to cause a denial-of-service condition.
CVE-2020-14522 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: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Uri Katz of Claroty reported these vulnerabilities to CISA.
4. MITIGATIONS
Softing Industrial Automation has released an update to mitigate the reported
vulnerabilities. The most up-to-date release at the time of this CISA advisory
can be found on the Softing Industrial Automation website .
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. 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.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.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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