CVE-2021-33032 : Vulnerability Insights and Analysis

A Remote Code Execution (RCE) vulnerability in the WebUI component of the eQ-3 HomeMatic CCU2 firmware up to and including version 2.57.5 and CCU3 firmware up to and including version 3.57.5 allows remote unauthenticated attackers to execute system commands as root via a simple HTTP request.

Understanding CVE-2021-33032

This CVE identifies a critical RCE vulnerability in the WebUI component of eQ-3 HomeMatic CCU2 and CCU3 firmware, enabling unauthorized remote attackers to run system commands with root privileges.

What is CVE-2021-33032?

The CVE-2021-33032 is a severe Remote Code Execution (RCE) vulnerability found in eQ-3 HomeMatic CCU2 and CCU3 firmware versions up to and including 2.57.5 and 3.57.5, respectively. This security flaw allows attackers to execute system commands remotely without authentication.

The Impact of CVE-2021-33032

This vulnerability poses a significant threat as it enables malicious actors to take complete control of the affected systems, execute arbitrary commands, and potentially disrupt or compromise the integrity and confidentiality of data stored on these devices.

Technical Details of CVE-2021-33032

The technical details of CVE-2021-33032 include:

Vulnerability Description

The vulnerability arises from inadequate security measures in the WebUI component of the eQ-3 HomeMatic CCU2 and CCU3 firmware, allowing unauthenticated attackers to exploit the system through a straightforward HTTP request.

Affected Systems and Versions

All eQ-3 HomeMatic CCU2 firmware versions up to and including 2.57.5 and CCU3 firmware versions up to and including 3.57.5 are impacted by this vulnerability.

Exploitation Mechanism

By sending a simple HTTP request, remote attackers can trigger the execution of system commands as the root user, compromising the security and integrity of the system.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-33032, consider the following steps:

Immediate Steps to Take

Update eQ-3 HomeMatic CCU2 and CCU3 firmware to the latest patched versions.
Restrict network access to vulnerable systems and implement strong access controls.
Monitor network traffic for any suspicious or unauthorized activities.

Long-Term Security Practices

Regularly apply security patches and updates to all network-connected devices.
Conduct security assessments and penetration testing to identify and address vulnerabilities proactively.
Educate users on best practices for maintaining device security and avoiding potential risks.

Patching and Updates

Refer to the official firmware updates provided by eQ-3 for CCU2 and CCU3 to address the CVE-2021-33032 vulnerability.