Command Injection in Guardian Language-System

Executive Summary

This vulnerability exists in the Guardian language-system's text.php file, where the 'id' GET parameter is passed directly into a PHP exec() function call without any sanitization or validation.

Because of this, an unauthenticated remote attacker can inject shell metacharacters into the 'id' parameter, allowing them to execute arbitrary operating system commands on the server.

No authentication is required to exploit this flaw, making it particularly dangerous.

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Detection Guidance

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

A common detection method is to send HTTP requests to the vulnerable endpoint with crafted 'id' parameters that include command injection payloads, such as appending shell commands or special characters, and observe the server's response or behavior.

• Use curl or similar tools to send requests like: curl "http://target/text.php?id=1;id" - to check if the output of the 'id' command is returned.
• Try payloads such as: curl "http://target/text.php?id=1;uname -a" to see if system information is disclosed.
• Monitor network traffic for unusual or unexpected command execution patterns or responses that indicate command injection.

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Impact Analysis

Exploitation of this vulnerability allows an attacker to execute arbitrary OS commands on the server hosting the Guardian language-system.

This can lead to full system compromise, unauthorized data access, data modification or deletion, disruption of services, and potentially using the server as a pivot point to attack other systems.

Because no authentication is required, attackers can exploit this remotely without any prior access.

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Compliance Impact

The vulnerability allows unauthenticated remote attackers to execute arbitrary OS commands on the server, which can lead to unauthorized access, data breaches, and potential manipulation or exposure of sensitive information.

Such unauthorized access and potential data compromise can negatively impact compliance with common standards and regulations like GDPR and HIPAA, which require protection of personal and sensitive data against unauthorized access and breaches.

Therefore, exploitation of this vulnerability could result in violations of these regulations due to failure to adequately secure systems and protect data confidentiality and integrity.

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Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable endpoint, applying input validation and sanitization on the 'id' parameter to prevent shell metacharacters from being executed, and updating or patching the Guardian language-system to a version where this vulnerability is fixed.

Since no authentication is required to exploit this vulnerability, it is critical to implement network-level protections such as firewall rules to block unauthorized access to the affected PHP scripts.

If patching is not immediately possible, consider disabling or restricting the functionality of the text.php script or isolating the affected system to prevent exploitation.

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