CVE-2019-10120 : What You Need to Know

Devices running eQ-3 HomeMatic CCU2 firmware versions prior to 2.41.8 and CCU3 firmware versions prior to 3.43.16 are vulnerable to automatic login configuration due to the retention of a session ID after logging out, identified as HMCCU-154.

Understanding CVE-2019-10120

This CVE highlights a security issue in eQ-3 HomeMatic CCU2 and CCU3 devices that allows for automatic login configuration even after a user logs out.

What is CVE-2019-10120?

CVE-2019-10120 refers to the vulnerability in eQ-3 HomeMatic CCU2 and CCU3 firmware versions that enables the persistence of a session ID post-logout, facilitating unauthorized access.

The Impact of CVE-2019-10120

The vulnerability poses a significant security risk as it allows attackers to maintain access to the system even after a user has logged out, potentially leading to unauthorized control and data breaches.

Technical Details of CVE-2019-10120

This section delves into the technical aspects of the CVE.

Vulnerability Description

The flaw in eQ-3 HomeMatic CCU2 and CCU3 firmware versions allows for automatic login configuration by retaining the session ID after a user logs out, known as HMCCU-154.

Affected Systems and Versions

Devices running eQ-3 HomeMatic CCU2 firmware versions prior to 2.41.8
Devices running eQ-3 HomeMatic CCU3 firmware versions prior to 3.43.16

Exploitation Mechanism

Attackers can exploit this vulnerability by leveraging the retained session ID to gain unauthorized access to the system, compromising its security.

Mitigation and Prevention

Protecting systems from CVE-2019-10120 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update eQ-3 HomeMatic CCU2 firmware to version 2.41.8 or later
Update eQ-3 HomeMatic CCU3 firmware to version 3.43.16 or later
Monitor system logs for any suspicious activities

Long-Term Security Practices

Implement multi-factor authentication for enhanced security
Regularly audit and review system access logs
Conduct security training for users to recognize and report suspicious activities

Patching and Updates

Apply firmware updates promptly to address security vulnerabilities and enhance system protection