Executive Summary

CVE-2023-53941 is a critical OS command injection vulnerability in EasyPHP Webserver version 14.1. It allows unauthenticated attackers to execute arbitrary system commands with administrative privileges by injecting malicious payloads through the app_service_control parameter. Attackers exploit this by sending specially crafted POST requests to the /index.php?zone=settings endpoint, enabling them to run commands on the server remotely. [1, 3]

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Impact Analysis

This vulnerability can lead to full system compromise with administrative privileges. An attacker can execute arbitrary commands remotely without authentication, potentially leading to unauthorized access, data theft, system manipulation, installation of backdoors, or complete control over the affected server. This poses a critical risk to confidentiality, integrity, and availability of the system. [1, 3]

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Detection Guidance

This vulnerability can be detected by monitoring for suspicious POST requests to the endpoint /index.php?zone=settings with the parameter app_service_control containing unusual or command-like values. For example, sending a test POST request with app_service_control=calc.exe can verify if command execution is possible. Network monitoring tools or intrusion detection systems can be configured to alert on such POST requests. Additionally, you can use curl commands to test the vulnerability, such as: curl -X POST -d "app_service_control=calc.exe" http://<target>/index.php?zone=settings. Detection involves checking for unexpected command execution or abnormal system behavior following such requests. [1, 3]

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Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable endpoint /index.php?zone=settings to trusted users or internal networks only, implementing web application firewall (WAF) rules to block POST requests with suspicious app_service_control parameter values, and disabling or restricting the functionality that processes the app_service_control parameter if possible. Applying any available patches or updates from EasyPHP Webserver is critical once released. Monitoring logs for exploitation attempts and isolating affected systems can also help reduce risk until a permanent fix is applied. [1, 3]

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Compliance Impact

The vulnerability allows unauthenticated attackers to execute arbitrary system commands with administrative privileges, leading to full system compromise. This can result in unauthorized access, modification, or destruction of sensitive data, which may violate compliance requirements of standards and regulations such as GDPR and HIPAA that mandate protection of data confidentiality, integrity, and availability. Therefore, exploitation of this vulnerability could lead to non-compliance with these regulations due to potential data breaches and loss of control over protected information. [1, 3]

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