Unprotected storage of credentials in IDEC Corporation products - CVE-2021-20827

Vulnerability identifier: #VU59297

CSH Severity: Low

CVSS v4: 7.2 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-20827

CWE-ID: CWE-256

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to gain access to other users' credentials.

The vulnerability exists due to application stored credentials in plain text in a configuration file on the system. A remote attacker on the local network can obtain the PLC web server user credentials from file servers, backup repositories, or ZLD files saved in SD cards.

FC6B MICROSmart All-in-One CPU Module
WindEDIT
FC6A MICROSmart Plus CPU Module
FC6B MICROSmart Plus CPU Module
FT1A Controller SmartAXIS Pro/Lite
FC6A MICROSmart All-in-One CPU Module
WindLDR
Data File Manager
WindEDIT Lite

Install updates from vendor's website.

FC6B MICROSmart All-in-One CPU Module - update to 2.40
FC6A MICROSmart Plus CPU Module - update to 2.40
FC6B MICROSmart Plus CPU Module - update to 2.40
FT1A Controller SmartAXIS Pro/Lite - update to 2.40
FC6A MICROSmart All-in-One CPU Module - update to 2.40
WindLDR - update to 8.20.0
Data File Manager - update to 2.13.0
WindEDIT Lite - update to 1.4.0

• https://us.idec.com/idec-us/en/USD/Software-Downloads-Automation-Organizer
• https://www.idec.com/home/lp/pdf/2021-12-24-PLC.pdf
• https://us.idec.com/idec-us/en/USD/Programmable-Logic-Controller/Micro-PLC/FC6A-MicroSmart/c/MicroSmart_FC6A
• https://jvn.jp/en/vu/JVNVU92279973/

• Multiple vulnerabilities in IDEC PLCs