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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-21-110-04) Delta Electronics CNCSoft ScreenEditor
21 April 2021
AusCERT Security Bulletin Summary
Product: Delta Electronics CNCSoft ScreenEditor
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
CVE Names: CVE-2021-22668
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ICS Advisory (ICSA-21-110-04)
Delta Electronics CNCSoft ScreenEditor
Original release date: April 20, 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: Low attack complexity
o Vendor: Delta Industrial Automation
o Equipment: CNCSoft ScreenEditor
o Vulnerability: Out-of-bounds Read
2. RISK EVALUATION
Successful exploitation of this vulnerability may allow arbitrary code
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of CNCSoft ScreenEditor are affected:
o CNCSoft Versions 1.01.28 (with ScreenEditor Version 1.01.2) and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 OUT-OF-BOUNDS READ CWE-125
The affected product is vulnerable to an out-of-bounds read while processing
project files, which may allow an attacker to execute arbitrary code.
CVE-2021-22668 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
Natnael Samson (@NattiSamson) working with Trend Micro's Zero 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.
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. CISA also 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. This
vulnerability is not exploitable remotely.
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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