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AUSCERT External Security Bulletin Redistribution
ESB-2020.0991
ICS Advisory (ICSA-20-077-01)
20 March 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Delta Electronics Industrial Automation CNCSoft ScreenEditor
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote with User Interaction
Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2020-7002 CVE-2020-6976
Original Bulletin:
https://www.us-cert.gov/ics/advisories/icsa-20-077-01
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ICS Advisory (ICSA-20-077-01)
Delta Electronics Industrial Automation CNCSoft ScreenEditor
Original release date: March 17, 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 7.8
o ATTENTION: Low skill level to exploit
o Vendor: Delta Electronics
o Equipment: Delta Industrial Automation CNCSoft ScreenEditor
o Vulnerabilities: Stack-based Buffer Overflow, Out-of-bounds Read
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could cause buffer overflow
conditions that may allow information disclosure, remote code execution, or
crash the application.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of CNCSoft ScreenEditor, a user interface, are affected:
o CNCSoft ScreenEditor v1.00.96 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121
Multiple stack-based buffer overflows can be exploited when a valid user opens
a specially crafted, malicious input file.
CVE-2020-7002 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 OUT-OF-BOUNDS READ CWE-125
An out-of-bounds read overflow can be exploited when a valid user opens a
specially crafted, malicious input file due to the lack of validation.
CVE-2020-6976 has been assigned to this vulnerability. A CVSS v3 base score of
3.3 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:L/I:N/A:N ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Taiwan
3.4 RESEARCHER
Natnael Samson (@NattiSamson) and kimiya, working with Trend Micro's Zero Day
Initiative, reported these vulnerabilities to CISA.
4. MITIGATIONS
Delta recommends the following:
o Update to the latest version of CNCSoft v1.01.24 (with ScreenEditor
v1.00.98).
o Restrict the interaction with 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.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. 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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