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AUSCERT External Security Bulletin Redistribution
ESB-2021.0711
(icsa-21-056-02) Fatek FvDesigner: Multiple vulnerabilities
26 February 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Fatek FvDesigner
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Modify Arbitrary Files -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Mitigation
CVE Names: CVE-2021-22683 CVE-2021-22670 CVE-2021-22666
CVE-2021-22662 CVE-2021-22638
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-056-02
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ICS Advisory (ICSA-21-056-02)
Fatek FvDesigner
Original release date: February 25, 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 skill level to exploit
o Vendor: Fatek
o Equipment: FvDesigner
o Vulnerabilities: Use After Free, Access of Uninitialized Pointer,
Stack-based Buffer Overflow, Out-of-Bounds Write, Out-of-Bounds Read
2. RISK EVALUATION
Successful exploitation of these vulnerabilities may allow an attacker to read/
modify information, execute arbitrary, and/or crash the application.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Fatek FvDesigner, a software tool used to design and
develop FATEK FV HMI series product projects, are affected:
o FvDesigner Version 1.5.76 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 USE AFTER FREE CWE-416
A use after free issue has been identified in the way the application processes
project files, allowing an attacker to craft a special project file that may
permit arbitrary code execution.
CVE-2021-22662 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 ).
3.2.2 ACCESS OF UNINITIALIZED POINTER CWE-824
An uninitialized pointer may be exploited while the application is processing
project files, allowing an attacker to craft a special project file that may
permit arbitrary code execution.
CVE-2021-22670 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 ).
3.2.3 STACK-BASED BUFFER OVERFLOW CWE-121
The affected product is vulnerable to a stack-based buffer overflow while
project files are being processed, allowing an attacker to craft a special
project file that may permit arbitrary code execution.
CVE-2021-22666 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 ).
3.2.4 OUT-OF-BOUNDS WRITE CWE-787
The affected product is vulnerable to an out-of-bounds write while processing
project files, allowing an attacker to craft a special project file that may
permit arbitrary code execution.
CVE-2021-22683 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 ).
3.2.5 OUT-OF-BOUNDS READ CWE-125
The affected product is vulnerable to an out-of-bounds read while processing
project files, allowing an attacker to craft a special project file that may
permit arbitrary code execution.
CVE-2021-22638 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} and rgod, working with Trend Micro's Zero Day
Initiative, reported these vulnerabilities to CISA.
4. MITIGATIONS
Fatek is aware of the issue and is currently developing a solution. For more
information, contact Fatek via email or by phone: +886-2-2808-2192
CISA recommends users take the following measures to protect themselves from
social engineering attacks:
o Only open 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 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 VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize 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. These
vulnerabilities are 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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