FTP Client PASV Mode IP Spoofing Vulnerability

Executive Summary

This vulnerability involves an FTP client trusting a malicious server's PASV response without validating the IP and port against the control connection. A rogue FTP server can send a fake IP:port in the 227 Passive Mode response, tricking the client into connecting to an arbitrary host.

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Detection Guidance

Monitor FTP traffic for PASV responses containing IP addresses or ports that do not match the control connection target. Use network sniffing tools like tcpdump or Wireshark to inspect FTP passive mode responses for anomalies.

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Impact Analysis

This could allow an attacker to redirect your FTP client to connect to a different host, potentially exposing sensitive data or enabling further attacks. It may also lead to unauthorized access or data leakage if exploited.

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Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by enabling unauthorized data exfiltration. If exploited, it may allow attackers to redirect FTP data transfers to malicious hosts, risking exposure of sensitive personal or health information. Organizations handling such data must ensure FTP clients validate server responses to mitigate this risk.

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Mitigation Strategies

Update Metasploit Framework to the latest version to apply PASV IP validation checks. Ensure FTP clients validate server responses against the control connection target. Disable passive mode if not required or restrict FTP server access to trusted hosts.

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