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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-21-124-02) Delta Electronics CNCSoft ScreenEditor
5 May 2021
AusCERT Security Bulletin Summary
Product: Delta Electronics CNCSoft ScreenEditor
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
CVE Names: CVE-2021-22672
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ICS Advisory (ICSA-21-124-02)
Delta Electronics CNCSoft ScreenEditor
Original release date: May 04, 2021
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: Exploitable remotely/low attack complexity
o Vendor: Delta Electronics
o Equipment: CNCSoft ScreenEditor
o Vulnerability: Out-of-bounds Write
2. RISK EVALUATION
Successful exploitation of this vulnerability could crash the device, and an
out-of-bounds write may allow remote code execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of CNCSoft ScreenEditor, a software management platform,
o CNCSoft ScreenEditor versions prior to v1.01.28
3.2 VULNERABILITY OVERVIEW
3.2.1 OUT-OF-BOUNDS WRITE CWE-787
An out-of-bounds write vulnerability exists and could cause the corruption of
data, a denial-of-service condition, or allow code execution. The vulnerability
may allow an attacker to remotely execute arbitrary code.
CVE-2021-22672 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/
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Taiwan
Kimiya, working with Trend Micro Zero's Day Initiative, reported this
vulnerability to CISA.
Delta Electronics has released an updated version of CNCSoft ScreenEditor and
recommends users install update v1.01.30 on all affected systems.
Delta Electronics also recommends users restrict the interaction of the
application to trusted files.
CISA recommends users take the following measures to protect themselves from
social engineering attacks:
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
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.
For any questions related to this report, please contact the CISA at:
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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