# Critical Vulnerability Summary ## Affected Products and Versions - **Product**: openITCOCKPIT Community Edition - **Version**: v5.3.1 ## Vulnerability Category - Insecure Deserialization - PHP Object Injection (potential) ## Vulnerability Severity - **Severity**: High - **CVSS v3.1 Base Metrics**: - Attack Vector: Network - Attack Complexity: High - Required Privileges: Low - User Interaction: None ## Vulnerability Overview openITCOCKPIT Community Edition v5.3.1 contains an insecure PHP deserialization pattern used for processing changelog entries. While this deserialization vulnerability currently cannot inject PHP objects under the current environment, it may lead to severe consequences such as remote code execution (RCE) if exploited in conjunction with future code changes. ## Vulnerable Code Examples The deserialization process for changelog data directly calls the `unserialize` function without explicit restrictions. The code is as follows: 1. `/opt/openitc/frontend/src/Model/Entity/Changelog.php`: ```php $data['data_unserialized'] = unserialize($data['data']); ``` 2. `/opt/openitc/frontend/src/Controller/ChangelogsController.php`: ```php $dataUnserialized = unserialize($change['data']); ``` ## Exploitation Analysis - Exploitation scenarios are still under development. However, based on the existing code vulnerability, a proof-of-concept attack demonstrates how to construct malicious serialized objects to trigger remote code execution. This can be achieved by tampering with changelog entries in the database and leveraging existing triggers to generate and execute PHP files. ## Impact on the System If successfully exploited, this vulnerability may lead to: - Remote Code Execution (RCE) - Arbitrary file modification - Data integrity compromise - Complete application compromise ## Remediation and Mitigation Measures ### Immediate Mitigation (Recommended) ```php unserialize($data, ['allowed_classes' => false]); ``` This modification prevents PHP object injection while maintaining normal functionality. ### Long-term Hardening (Preferred) 1. Replace PHP array serialization with safer formats such as JSON. 2. Set changelog data to read-only to prevent execution. 3. Avoid unauthenticated deserialization processes.