CVE-2021-32984 : Exploit Details and Defense Strategies

Automation Direct CLICK PLC CPU Modules Authentication Bypass Using an Alternate Path or Channel (CWE-288) vulnerability allows an attacker to privilege escalate for unauthorized access.

Understanding CVE-2021-32984

This CVE refers to vulnerabilities in Automation Direct CLICK PLC CPU Modules affecting versions prior to 3.00.

What is CVE-2021-32984?

The vulnerability in Automation Direct CLICK PLC CPU Modules allows attackers to escalate privileges when the system is unlocked, enabling them to access the PLC project without proper authorization.

The Impact of CVE-2021-32984

With a CVSS base score of 9.8, this critical vulnerability can result in high impacts on confidentiality, integrity, and availability of the affected systems.

Technical Details of CVE-2021-32984

The vulnerability allows attackers to bypass authentication using an alternate path or channel, potentially leading to unauthorized access to the PLC system.

Vulnerability Description

All programming connections in the affected CPU modules receive the same unlocked privileges, enabling attackers to perform privilege escalation.

Affected Systems and Versions

Automation Direct CLICK PLC CPU Modules of C0-1x CPUs with firmware versions less than 3.00 are vulnerable to this authentication bypass issue.

Exploitation Mechanism

During the unlocked state, an authorized user can be targeted by an attacker to connect to the PLC and read the project without proper authorization.

Mitigation and Prevention

To address CVE-2021-32984, users are advised to take immediate steps and follow long-term security practices to secure their systems.

Immediate Steps to Take

Automation Direct recommends updating the software and firmware to version 3.00 or above to mitigate the vulnerabilities. Users should also adhere to the provided security guidelines for enhanced protection.

Long-Term Security Practices

In addition to patching and updating to the latest version, users should implement strict access controls, monitor system activity, and regularly review security configurations to prevent unauthorized access.

Patching and Updates

Regularly check for security updates from Automation Direct and apply patches promptly to ensure the systems are protected from potential threats.