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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-21-182-03) Delta Electronics DOPSoft
2 July 2021
AusCERT Security Bulletin Summary
Product: Delta Electronics DOPSoft Version 188.8.131.52 and prior
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Access Confidential Data -- Existing Account
Reduced Security -- Existing Account
CVE Names: CVE-2021-27455 CVE-2021-27412
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ICS Advisory (ICSA-21-182-03)
Delta Electronics DOPSoft
Original release date: July 01, 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
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1. EXECUTIVE SUMMARY
o CVSS v3 7.8
o ATTENTION: Low attack complexity
o Vendor: Delta Electronics
o Equipment: DOPSoft
o Vulnerabilities: Out-of-bounds Read
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow arbitrary code
execution and disclose information.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of DOPSoft, a software supporting the DOP-100 series HMI
screens, are affected:
o DOPSoft Version 184.108.40.206 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 disclose information.
CVE-2021-27455 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:L/UI:N/S:U/
3.2.2 OUT-OF-BOUNDS READ CWE-125
The affected product is vulnerable to an out-of-bounds read, which may allow an
attacker to execute arbitrary code.
CVE-2021-27412 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been assigned; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/C:H/
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 these vulnerabilities to CISA.
Delta Electronics has released an updated version of DOPSoft and recommends
users install this update on all affected systems.
CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. 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 these vulnerabilities. These
vulnerabilities are 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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