Delta Electronics ISPSoft

1. EXECUTIVE SUMMARY

• CVSS v3 7.8
• ATTENTION: Low skill level to exploit
• Vendor: Delta Electronics (Delta)
• Equipment: ISPSoft
• Vulnerability: Use After Free

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker to execute code under the privileges of the application.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of ISPSoft, a PLC program development tool, are affected:

ISPSoft: v3.12 and prior

3.2 VULNERABILITY OVERVIEW

3.2.1    USE AFTER FREE CWE-416

A use after free issue has been identified in the way the application processes project files, allowing an attacker to craft a special project file that may allow arbitrary code execution. 

CVE-2020-27280 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

• CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: Taiwan

3.4 RESEARCHER

Francis Provencher {PRL}, working with Trend Micro’s Zero Day Initiative, reported this vulnerability to CISA.

4. MITIGATIONS

Delta recommends updating to v3.12.01. Users may contact Delta customer service to obtain this patch.

CISA recommends users take the following measures to protect themselves from social engineering attacks:

• Do not click web links or open unsolicited attachments in email messages.
• Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
• 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 this vulnerability. This vulnerability is not exploitable remotely.