Authenticated Remote Code Execution in Cockpit CMS via Malicious Collection Rules

Executive Summary

This vulnerability exists in Cockpit CMS within the /cockpit/collections/save_collection endpoint. It allows authenticated attackers who have collection management privileges to inject arbitrary PHP code into the collection rules parameters.

The injected PHP code is written directly to server-side PHP files and then executed via the include() function, enabling the attacker to execute arbitrary commands on the underlying server.

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Detection Guidance

This vulnerability can be detected by monitoring for suspicious activity involving the /cockpit/collections/save_collection endpoint, especially requests made by authenticated users with collection management privileges that include unusual or suspicious PHP code in the rules parameters.

One approach is to inspect web server logs or application logs for POST requests to /cockpit/collections/save_collection containing PHP tags or code snippets in the payload.

Example commands to detect potential exploitation attempts include using grep or similar tools to search logs for PHP code injection patterns:

• grep -i 'POST /cockpit/collections/save_collection' /var/log/apache2/access.log | grep -E '<\?php|eval\(|base64_decode\('
• grep -r '<?php' /path/to/cockpit/storage/collections/

Additionally, scanning the storage directory for recently modified PHP files containing injected code can help identify exploitation.

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Impact Analysis

This vulnerability can lead to remote code execution on the server hosting Cockpit CMS. An attacker with the necessary privileges can run arbitrary commands, potentially gaining full control over the server.

Such control can result in data theft, data manipulation, service disruption, or further attacks within the network.

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Compliance Impact

The vulnerability allows authenticated attackers to execute arbitrary code on the server, leading to complete server compromise and potential data exfiltration.

Such a compromise can result in unauthorized access to sensitive personal or protected health information, which may violate compliance requirements under standards like GDPR and HIPAA.

Therefore, this vulnerability poses a significant risk to maintaining compliance with data protection regulations by potentially exposing confidential data and failing to ensure data integrity and confidentiality.

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Mitigation Strategies

Immediate mitigation steps include applying the official patch released by the Cockpit CMS team that addresses this vulnerability.

If patching is not immediately possible, restrict access to the /cockpit/collections/save_collection endpoint to trusted users only, and ensure that only authenticated users with necessary privileges can access collection management features.

Additionally, monitor and audit collection rules parameters for any suspicious PHP code injection attempts.

Long-term remediation involves avoiding direct execution of user input, storing rules as data files (e.g., JSON), implementing strict validation to reject PHP tags, and using whitelist-based execution for predefined logic.

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