EUVD-2025-21950

Comprehensive Technical Analysis of EUVD-2025-21950

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-21950 pertains to an incorrect authorization check in the 'plant transfer' function of the Growatt cloud service. This flaw allows an attacker with a valid account to transfer any plant into their account, effectively taking control of the plant's management and data.

Severity Evaluation:

• Base Score: 9.4 (Critical)
• Base Score Version: 4.0
• Base Score Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:H/S:P/V:C

The high base score indicates a critical vulnerability due to the potential for significant impact on confidentiality, integrity, and availability. The attack vector is network-based (AV:N), requires low complexity (AC:L), and does not require user interaction (UI:N). The attacker needs low privileges (PR:L) and can achieve high confidentiality, integrity, and availability impacts (VC:H, VI:H, VA:H).

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attack: The attacker can exploit this vulnerability remotely over the network.
• Authenticated User: The attacker must have a valid account on the Growatt cloud service.

Exploitation Methods:

• Authorization Bypass: The attacker can bypass the authorization checks in the 'plant transfer' function to transfer any plant to their account.
• Data Manipulation: Once the plant is transferred, the attacker can manipulate plant data, disrupt operations, and potentially cause physical damage.

3. Affected Systems and Software Versions

Affected Systems:

• Growatt Cloud Service

Software Versions:

• https://server.growatt.com: Versions prior to 13 June 2025
• https://oss.growatt.com: Versions prior to 13 June 2025

4. Recommended Mitigation Strategies

Immediate Actions:

• Patch Deployment: Ensure that all affected systems are updated to the latest versions released after 13 June 2025.
• Access Controls: Implement strict access controls and monitor for unusual account activities.
• User Education: Educate users about the risks and ensure they use strong, unique passwords.

Long-Term Strategies:

• Regular Audits: Conduct regular security audits and vulnerability assessments.
• Intrusion Detection: Deploy intrusion detection systems (IDS) to monitor for unauthorized access attempts.
• Multi-Factor Authentication (MFA): Implement MFA to add an extra layer of security for user accounts.

5. Impact on European Cybersecurity Landscape

The vulnerability in the Growatt cloud service poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals relying on renewable energy management systems. The potential for unauthorized access and control of energy plants can lead to disruptions in energy supply, financial losses, and even physical damage. This underscores the need for robust cybersecurity measures in critical infrastructure sectors.

6. Technical Details for Security Professionals

Vulnerability Details:

• CVE ID: CVE-2025-29757
• Assigner: DIVD
• References:
  • https://server.growatt.com
  • https://oss.growatt.com
  • https://csirt.divd.nl/CVE-2025-29757
  • https://csirt.divd.nl/DIVD-2025-00011

Technical Insights:

• Authorization Check: The flaw lies in the authorization logic of the 'plant transfer' function. Ensure that proper checks are in place to verify the ownership and permissions before allowing any transfer.
• Logging and Monitoring: Implement comprehensive logging and monitoring to detect and respond to any unauthorized transfer attempts.
• Code Review: Conduct a thorough code review of the authorization mechanisms to identify and rectify similar vulnerabilities.

Conclusion: The vulnerability EUVD-2025-21950 highlights the importance of robust authorization mechanisms in cloud services, especially those managing critical infrastructure. Immediate patching, enhanced access controls, and continuous monitoring are essential to mitigate the risks associated with this vulnerability. The European cybersecurity community must remain vigilant and proactive in addressing such threats to ensure the security and reliability of energy management systems.