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AUSCERT External Security Bulletin Redistribution
ESB-2021.3042
Advisory (icsa-21-252-02) Delta Electronics DOPSoft 2
10 September 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Delta Electronics DOPSoft 2
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Alternate Program
CVE Names: CVE-2021-38406 CVE-2021-38404 CVE-2021-38402
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-252-02
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ICS Advisory (ICSA-21-252-02)
Delta Electronics DOPSoft 2
Original release date: September 09, 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 attack complexity
o Vendor: Delta Electronics
o Equipment: DOPSoft 2
o Vulnerabilities: Stack-based Buffer Overflow, Out-of-Bounds Write,
Heap-based Buffer Overflow
2. RISK EVALUATION
Successful exploitation of these vulnerabilities may allow arbitrary code
execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of DOPSoft 2 are affected:
o DOPSoft 2: Version 2.00.07 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121
The affected application lacks proper validation of user-supplied data when
parsing specific project files. This could lead to a stack-based buffer
overflow while trying to copy to a buffer during font string handling. An
attacker could leverage this vulnerability to execute code in the context of
the current process.
CVE-2021-38402 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 WRITE CWE-787
The affected application lacks proper validation of user-supplied data when
parsing specific project files. This could result in multiple out-of-bounds
write instances. An attacker could leverage this vulnerability to execute code
in the context of the current process.
CVE-2021-38406 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 HEAP-BASED BUFFER OVERFLOW CWE-122
The affected application lacks proper validation of user-supplied data when
parsing specific project files. This could result in a heap-based buffer
overflow. An attacker could leverage this vulnerability to execute code in the
context of the current process.
CVE-2021-38404 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
kimiya, working with Trend Micro's Zero Day Initiative, reported these
vulnerabilities to CISA.
4. MITIGATIONS
DOPSoft 2 will not receive an update to mitigate these vulnerabilities because
it is an end-of-life product. Delta Electronics recommends users to switch to
the replacement software when available.
CISA recommends users take the following measures to protect themselves from
social engineering attacks:
o Only uses project files from trusted sources.
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
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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