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AUSCERT External Security Bulletin Redistribution
ESB-2021.0079
Advisory (icsa-21-007-04) Delta Electronics CNCSoft-B
8 January 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Delta Electronics CNCSoft-B
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-27293 CVE-2020-27291 CVE-2020-27289
CVE-2020-27287
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-007-04
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ICS Advisory (ICSA-21-007-04)
Delta Electronics CNCSoft-B
Original release date: January 07, 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 skill level to exploit
o Vendor: Delta Electronics
o Equipment: CNCSoft-B
o Vulnerabilities: Out-of-bounds Write, Out-of-bounds Read, Untrusted Pointer
Dereference, Type Confusion
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 1.0.0.2 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 OUT-OF-BOUNDS WRITE CWE-787
The affected product is vulnerable to an out-of-bounds write while processing
project files, which may allow an attacker to execute arbitrary code.
CVE-2020-27287 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/
I:H/A:H ).
3.2.2 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-2020-27291 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/
I:H/A:H ).
3.2.3 UNTRUSTED POINTER DEREFERENCE CWE-822
The affected product has a null pointer dereference issue while processing
project files, which may allow an attacker to execute arbitrary code.
CVE-2020-27289 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/
I:H/A:H ).
3.2.4 ACCESS OF RESOURCE USING INCOMPATIBLE TYPE ('TYPE CONFUSION') CWE-843
The affected product has a type confusion issue while processing project files,
which may allow an attacker to execute arbitrary code.
CVE-2020-27293 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/
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
Delta Electronics has released an updated version for CNCSoft-B and recommends
users install v1.0.0.3 on all affected systems.
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that VPN
is only as secure as the connected devices.
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.
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.
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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