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AUSCERT External Security Bulletin Redistribution
Multiple stack-based overflow vulnerabilities in Delta
Electronics PMSoft, a software development tool
27 April 2018
AusCERT Security Bulletin Summary
Product: Delta Electronics PMSoft
Operating System: Windows
Impact/Access: Denial of Service -- Remote with User Interaction
Execute Arbitrary Code/Commands -- Remote with User Interaction
CVE Names: CVE-2018-8839
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Delta Electronics PMSoft
Original release date: April 26, 2018
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1. EXECUTIVE SUMMARY
o CVSS v3 7.1
o ATTENTION: Low skill level to exploit.
o Vendor: Delta Electronics
o Equipment: PMSoft
o Vulnerabilities: Multiple Stack-Based Buffer Overflow vulnerabilities
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could cause the application to
crash; stack-based buffer overflow conditions may allow arbitrary code
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of PMSoft, a software development tool for motion
controllers, are affected:
o PMSoft v 2.10 or prior.
3.2 VULNERABILITY OVERVIEW
3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121
The application has multiple stack-based buffer overflow vulnerabilities where
a .ppm file can introduce a value larger than is readable by PMSoft's
fixed-length stack buffer. This can cause the buffer to be overwritten, which
may allow arbitrary code execution or cause the application to crash.
CVE-2018-8839 has been assigned to these vulnerabilities. A CVSS v3 base score
of 7.1 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/
o Critical Infrastructure Sectors: Critical Manufacturing
o Countries/Areas Deployed: Worldwide
o Company Headquarters Location: Taiwan
Ghirmay Desta, working with Trend Micro's Zero Day Initiative, reported these
vulnerabilities to NCCIC.
Delta Electronics recommends affected users update to at least PMSoft v2.11,
which was made available as of March 22, 2018, or the latest available version.
This update can be found for download at the following location:
NCCIC recommends that users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. 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.
NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
NCCIC also provides a section for control systems security recommended
practices on the ICS-CERT web page. 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
in the ICS-CERT Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber
Intrusion Detection and Mitigation Strategies, that is available for download
from the ICS-CERT website.
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to NCCIC for tracking
and correlation against other incidents.
NCCIC also recommends that 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 NCCIC at:
Toll Free: 1-888-282-0870
For industrial control systems cybersecurity information: http://
or incident reporting: https://ics-cert.us-cert.gov/Report-Incident?
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