Overview
The cybersecurity landscape is yet again shaken by a critical vulnerability, CVE-2025-57633, affecting the popular FTP-Flask-Python software. This vulnerability allows unauthenticated remote attackers to execute arbitrary Operating System (OS) commands, potentially leading to full system compromise or severe data leakage. Given the ubiquity of FTP-Flask-Python in diverse IT environments, the potential impact of this vulnerability is massive, underscoring the importance of immediate patching and remediation.
Vulnerability Summary
CVE ID: CVE-2025-57633
Severity: Critical (9.8 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
FTP-Flask-python | Through commit 5173b68
How the Exploit Works
The vulnerability arises from the /ftp.html endpoint’s “Upload File” action that constructs a shell command from the ftp_file parameter. The command is then executed using os.system() without any sanitization or escaping. This lack of input validation allows an attacker to inject malicious commands embedded within the ftp_file parameter. Since these commands are executed with the same privileges as the FTP-Flask-python process, this could lead to unauthorized access, data exfiltration, or even complete system compromise.
Conceptual Example Code
This conceptual example demonstrates how an attacker might exploit the vulnerability. The attacker crafts a malicious file that includes a shell command and submits it via the “Upload File” action.
POST /ftp.html HTTP/1.1
Host: target.example.com
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary
------WebKitFormBoundary
Content-Disposition: form-data; name="ftp_file"; filename="malicious.txt"
Content-Type: text/plain
; rm -rf / --no-preserve-root; # This is an example of a dangerous command
------WebKitFormBoundary--This HTTP request will cause the FTP-Flask-python server to execute the malicious command (`rm -rf / –no-preserve-root`), which can result in severe damage to the system.
Mitigation Guidance
It is highly recommended that users apply the vendor’s patch as soon as possible. In the meantime, users can employ a Web Application Firewall (WAF) or Intrusion Detection System (IDS) for temporary mitigation. These tools can help detect and block attempts to exploit this vulnerability until the patch can be applied.
