In this task an FTP server is provided but it was a bit strange. Infact I tried with several FTP clients but none of them worked properly. So I tried to connect via netcat but the LIST command wasn’t working so googling I saw that if I specify a parameter for STAT command it will behave just like LIST. As expected here’s the flag file: key_is_in_this_file_afjoirefjort94dv7u.txt

Now retriving it as specified on the RFC won’t work so after some struggle I tried browsing this URL in firefox:

and it gave me the flag: SECCON{S0m3+im3_Pr0t0c0l_t411_4_1i3.}