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Lack of user input validation in ProFTPD can lead to a remote root vulnerability. On systems that support it ProFTPD will attempt to modify the name of the program being executed (argv[0]) to display the command being executed by the logged on user. It does this by using snprintf to copy the input of the user into a buffer. The call to snprintf is in the 'set_proc_title' function in the main.c source file. It is only compiled in if the define PF_ARGV_TYPE equals the PF_ARGV_WRITABLE define. ProFTPD passes the user input to snprintf as the format argument string of the function call. This allows remote users to supply possible dangerous format arguments to snprintf.

Lack of user input validation in ProFTPD can lead to a remote root vulnerability. On systems that support it ProFTPD will attempt to modify the name of the program being executed (argv[0]) to display the command being executed by the logged on user. It does this by using snprintf to copy the input of the user into a buffer. The call to snprintf is in the 'set_proc_title' function in the main.c source file. It is only compiled in if the define PF_ARGV_TYPE equals the PF_ARGV_WRITABLE define. ProFTPD passes the user input to snprintf as the format argument string of the function call. This allows remote users to supply possible dangerous format arguments to snprintf.