Command Injection in Guardian Language-System

Executive Summary

CVE-2026-34117 is an unauthenticated OS command injection vulnerability in the Guardian Language-System. It occurs because the 'id' GET parameter in the text_to_subtitles.php file is passed directly into a PHP exec() call without any sanitization or validation.

This means an attacker can append shell metacharacters to the 'id' parameter and execute arbitrary operating system commands on the server hosting the application.

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Impact Analysis

This vulnerability allows an unauthenticated remote attacker to execute arbitrary OS commands on the server, which can lead to full system compromise.

• Unauthorized access to sensitive data stored on the server.
• Potential disruption or denial of service by executing malicious commands.
• Installation of malware or backdoors, leading to persistent compromise.
• Loss of control over the server environment and possible lateral movement within the network.

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Detection Guidance

This vulnerability can be detected by testing the 'id' GET parameter in the text_to_subtitles.php file for command injection. Since the parameter is passed directly into a PHP exec() call without sanitization, sending specially crafted requests with shell metacharacters can reveal if arbitrary commands are executed.

• Use curl or similar tools to send requests with payloads that include shell metacharacters, for example: curl "http://<target>/text_to_subtitles.php?id=1;id"
• Monitor server responses or behavior for signs of command execution, such as output from injected commands.
• Check server logs for unusual command execution or unexpected parameters passed to exec() calls.

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Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable script, applying input validation or sanitization to the 'id' GET parameter, and updating or patching the Guardian Language-System to a version that fixes this issue.

• Restrict network access to the text_to_subtitles.php endpoint to trusted users only.
• Implement input validation to reject or sanitize shell metacharacters in the 'id' parameter.
• Apply any available patches or updates from the vendor addressing this vulnerability.
• Monitor logs for suspicious activity related to this vulnerability.

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