CVE-2019-10119 : Exploit Details and Defense Strategies

Devices from eQ-3 HomeMatic CCU2 versions earlier than 2.41.8 and CCU3 versions earlier than 3.43.16 are vulnerable to an authentication bypass vulnerability known as HMCCU-154. This allows attackers to obtain session IDs and gain unauthorized access as administrators.

Understanding CVE-2019-10119

Devices from eQ-3 HomeMatic CCU2 and CCU3 are affected by a critical authentication vulnerability that can lead to unauthorized access.

What is CVE-2019-10119?

CVE-2019-10119 is an authentication bypass vulnerability in eQ-3 HomeMatic CCU2 and CCU3 devices that allows attackers to acquire session IDs and automatically log in as administrators.

The Impact of CVE-2019-10119

The vulnerability enables unauthorized individuals to gain administrative access to affected devices, potentially leading to further compromise of the system and sensitive data.

Technical Details of CVE-2019-10119

Devices from eQ-3 HomeMatic CCU2 and CCU3 are susceptible to unauthorized access due to the following:

Vulnerability Description

Lack of proper authorization checks in the authentication process
Exploitation of HMCCU-154 vulnerability through invalid login attempts

Affected Systems and Versions

eQ-3 HomeMatic CCU2 versions prior to 2.41.8
eQ-3 HomeMatic CCU3 versions prior to 3.43.16

Exploitation Mechanism

Attackers can exploit the vulnerability by performing invalid login attempts to the RemoteApi account, allowing them to acquire session IDs and gain administrator privileges.

Mitigation and Prevention

It is crucial to take immediate steps to secure the affected devices and implement long-term security practices to prevent similar vulnerabilities in the future.

Immediate Steps to Take

Update devices to the latest firmware versions (CCU2 2.41.8 and CCU3 3.43.16)
Change default passwords and implement strong authentication mechanisms
Monitor and restrict access to RemoteApi accounts

Long-Term Security Practices

Conduct regular security assessments and audits
Educate users on secure authentication practices
Implement network segmentation to limit exposure

Patching and Updates

Regularly check for firmware updates and security patches
Apply updates promptly to mitigate known vulnerabilities