Executive Summary

CVE-2025-57633 is a command injection vulnerability in the FTP-Flask-python project. It occurs in the /ftp.html endpoint's 'Upload File' action, where the ftp_file parameter is directly used to build a shell command executed by os.system() without any sanitization or escaping. This allows unauthenticated remote attackers to inject and execute arbitrary operating system commands on the server. [1]

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Impact Analysis

This vulnerability can allow unauthenticated remote attackers to execute arbitrary OS commands on the affected server. This could lead to unauthorized access, data theft, data modification, service disruption, or complete system compromise depending on the attacker's actions. [1]

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Detection Guidance

This vulnerability can be detected by monitoring requests to the /ftp.html endpoint, specifically POST requests with the 'ftp_file' parameter. You can look for unusual or suspicious command injection patterns in the ftp_file parameter. On the server, checking logs for unexpected shell command executions triggered by the FTP-Flask-python application may help. Network intrusion detection systems (NIDS) can be configured to alert on suspicious payloads targeting the /ftp.html endpoint. Specific commands might include using tools like curl or wget to send crafted POST requests to /ftp.html with payloads attempting command injection, and monitoring server logs for execution results. For example, a test command could be: curl -X POST -F "ftp_file=;id;" http://target/ftp.html and then checking server logs for the output of the 'id' command. [1]

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Mitigation Strategies

Immediate mitigation steps include disabling or restricting access to the /ftp.html endpoint, especially the 'Upload File' functionality, until a patch is applied. Input validation and sanitization should be implemented to prevent command injection, such as avoiding the use of os.system() with unsanitized input. Using safer alternatives like subprocess with argument lists or escaping inputs properly can help. Additionally, applying network-level restrictions to limit access to the vulnerable service and monitoring for exploitation attempts are recommended. [1]

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