File Transfer Protocol (FTP)

SSRF is an exploit using the *shortcoming of URL Parsing#* from the targeted server to access internal service, which should not be accessible from the outside world, by passing arbitrary commands to that service embedded with the URL parameter. The attacker could use the server as a proxy to request services from the supposedly internal processes. They could smuggle protocols such as SMTP, File Transfer Protocol (FTP), HTTP and Redis within the URL.

#Secure Shell (SSH) could be used to tunnel insecure #Transmission Control Protocol (TCP) connections such as File Transfer Protocol (FTP) or IMAP if the configuration AllowTcpForwarding is enabled. This provides a secure layer onto the TCP connection without resort to displacing such protocol within a network.

Generally, it used for general-purpose block-oriented transmission and authentication such as email, File Transfer Protocol (FTP)#, web etc.