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AUSCERT External Security Bulletin Redistribution
ESB-2021.1196
Advisory (icsa-21-098-01) FATEK Automation WinProladder
9 April 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: FATEK Automation WinProladder
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Mitigation
CVE Names: CVE-2021-2748
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-098-01
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ICS Advisory (ICSA-21-098-01)
FATEK Automation WinProladder
Original release date: April 08, 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 7.8
o ATTENTION: Low attack complexity
o Vendor: FATEK Automation
o Equipment: WinProladder
o Vulnerability: Integer Underflow
2. RISK EVALUATION
Successful exploitation of this vulnerability could cause execution of
arbitrary code.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of FATEK Automation WinProladder, a PLC, are affected:
o WinProladder Versions 3.30 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 INTEGER UNDERFLOW (WRAP OR WRAPAROUND) CWE-191
The affected product is vulnerable to an integer underflow, which may cause an
out-of-bounds write and allow an attacker to execute arbitrary code.
CVE-2021-2748 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Taiwan
3.4 RESEARCHER
Francis Provencher {PRL}, working with Trend Micro's Zero Day Initiative,
reported this vulnerability to CISA.
4. MITIGATIONS
FATEK Automation is aware of the issue and is currently developing a solution.
For more information, contact FATEK via email or phone: +886-2-2808-2192
CISA recommends users take the following measures to protect themselves from
social engineering attacks:
o Only use project files from trusted sources.
o Ensure the least-privilege user principle is followed.
o Do not click web links or open unsolicited attachments in email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
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 this vulnerability. This
vulnerability is not exploitable remotely.
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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