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AUSCERT External Security Bulletin Redistribution
ESB-2021.1353
Advisory (icsa-21-110-05) Delta Electronics CNCSoft-B
21 April 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Delta Electronics CNCSoft-B
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-22664 CVE-2021-22660
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-110-05
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ICS Advisory (ICSA-21-110-05)
Delta Electronics CNCSoft-B
Original release date: April 20, 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: CNCSoft-B
o Vulnerabilities: Out-of-bounds Read, Out-of-bounds Write
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could lead to arbitrary code
execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of CNCSoft-B, a software management platform, are
affected:
o CNCSoft-B Versions 1.0.0.3 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, which may allow an
attacker to execute arbitrary code.
CVE-2021-22660 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 product is vulnerable to an out-of-bounds write, which may allow
an attacker to execute arbitrary code.
CVE-2021-22664 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
Natnael Samson (@NattiSamson) working with Trend Micro's Zero Day Initiative
reported these vulnerabilities to CISA.
4. MITIGATIONS
Delta Electronics has released an updated version of CNCSoft-B and recommends
users install v1.0.0.4 or later 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
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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