CVE-2019-14984 : Exploit Details and Defense Strategies

The eQ-3 Homematic CCU2 and CCU3, when the XML-API through 1.2.0 AddOn is installed, can be exploited by unauthorized attackers who have access to the web interface. This vulnerability occurs because the addons/xmlapi/exec.cgi script, which is not documented, utilizes CMD_EXEC to execute TCL code from a POST request.

Understanding CVE-2019-14984

This CVE involves a Remote Code Execution vulnerability in eQ-3 Homematic CCU2 and CCU3.

What is CVE-2019-14984?

The vulnerability allows unauthenticated attackers with web interface access to execute TCL code through the addons/xmlapi/exec.cgi script.

The Impact of CVE-2019-14984

Unauthorized individuals can exploit this vulnerability to execute arbitrary code on the affected systems, potentially leading to further compromise.

Technical Details of CVE-2019-14984

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability arises from the undocumented addons/xmlapi/exec.cgi script using CMD_EXEC to run TCL code from a POST request.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions: All versions with the XML-API through 1.2.0 AddOn installed are affected.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending a crafted POST request to the addons/xmlapi/exec.cgi script, allowing them to execute malicious TCL code.

Mitigation and Prevention

Protecting systems from CVE-2019-14984 requires immediate actions and long-term security practices.

Immediate Steps to Take

Disable or restrict access to the XML-API through 1.2.0 AddOn if not essential.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch the eQ-3 Homematic CCU2 and CCU3 systems.
Implement strong access controls and authentication mechanisms.

Patching and Updates

Apply patches provided by the vendor to address the vulnerability and enhance system security.