Executive Summary

The vulnerability in SIM-PKH version 2.4.1 is an arbitrary file upload flaw that allows authenticated attackers to upload malicious PHP files to the server.

Attackers exploit a file upload form by submitting PHP code through the 'fupload' parameter at the 'aksi_pengurus.php' endpoint with 'module=pengurus' and 'act=update' parameters.

The uploaded PHP files are stored in the 'foto' directory and can be executed as web scripts, enabling attackers to run arbitrary code on the affected server.

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Impact Analysis

This vulnerability can lead to remote code execution on the affected server, allowing attackers to execute arbitrary commands or scripts.

Such unauthorized access can compromise the integrity, confidentiality, and availability of the system and its data.

Attackers could potentially use this access to steal sensitive information, disrupt services, or further penetrate the network.

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Detection Guidance

This vulnerability can be detected by checking for the presence of uploaded PHP files in the /foto/ directory that should not normally contain executable scripts.

You can also monitor HTTP POST requests to the endpoint /admin/modul/mod_pengurus/aksi_pengurus.php with parameters module=pengurus and act=update, especially those containing the 'fupload' parameter.

Suggested commands to detect potential exploitation include:

• Using grep to find PHP files in the foto directory: `find /path/to/foto -name '*.php'`
• Checking web server access logs for POST requests to the vulnerable endpoint: `grep 'POST /admin/modul/mod_pengurus/aksi_pengurus.php' /var/log/apache2/access.log`
• Using curl to test upload functionality (requires authentication): `curl -X POST -F '[email protected]' 'http://target/admin/modul/mod_pengurus/aksi_pengurus.php?module=pengurus&act=update'`

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Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable endpoint to trusted users only, as the vulnerability requires authentication.

Disable or restrict file uploads via the 'fupload' parameter if possible.

Implement strict validation and sanitization of uploaded files to prevent uploading executable PHP scripts.

Remove any suspicious PHP files found in the /foto/ directory.

Apply any available patches or updates from the software vendor addressing this vulnerability.

Monitor logs for suspicious activity related to the vulnerable endpoint.

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Compliance Impact

The vulnerability allows authenticated attackers to upload and execute malicious PHP files on the affected server, leading to potential remote code execution.

Such unauthorized access and execution of malicious code can compromise the confidentiality, integrity, and availability of sensitive data.

This poses a significant risk to compliance with common standards and regulations like GDPR and HIPAA, which require protection of personal and sensitive information against unauthorized access and breaches.

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