CVE-2020-12834 : Exploit Details and Defense Strategies

The eQ-3 Homematic Central Control Units (CCU) versions 2.51.6 and 3.51.6 are vulnerable to Remote Code Execution through the JSON API Method ReGa.runScript, allowing unauthenticated attackers to exploit the default auto-login feature.

Understanding CVE-2020-12834

What is CVE-2020-12834?

This CVE identifies a vulnerability in eQ-3 Homematic CCU2 and CCU3 that enables Remote Code Execution by unauthenticated attackers via the JSON API Method ReGa.runScript.

The Impact of CVE-2020-12834

The vulnerability allows attackers with web interface access to execute arbitrary code on the affected CCU devices, compromising their security and potentially leading to further system exploitation.

Technical Details of CVE-2020-12834

Vulnerability Description

The vulnerability arises from the default auto-login feature being enabled during the initial setup or factory reset, providing an entry point for unauthenticated attackers to exploit the ReGa.runScript method.

Affected Systems and Versions

eQ-3 Homematic CCU2 versions 2.51.6 and prior
eQ-3 Homematic CCU3 versions 3.51.6 and prior

Exploitation Mechanism

Attackers can leverage the JSON API Method ReGa.runScript to execute malicious code on vulnerable eQ-3 Homematic CCU devices, taking advantage of the auto-login feature.

Mitigation and Prevention

Immediate Steps to Take

Disable the auto-login feature on the eQ-3 Homematic CCU devices to prevent unauthorized access and code execution.
Implement strong authentication mechanisms to secure the web interface access.

Long-Term Security Practices

Regularly update the firmware of eQ-3 Homematic CCU devices to patch known vulnerabilities and enhance security.
Conduct security assessments and audits to identify and address potential weaknesses in the system.

Patching and Updates

Apply patches and updates provided by eQ-3 for the CCU2 and CCU3 devices to mitigate the CVE-2020-12834 vulnerability and enhance overall system security.