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Classic CTF topic about FTP protocol
2022-07-06 00:18:00 【qq_ twenty-nine million five hundred and sixty-six thousand six】
Gave one to pcap package , The prompt uses ftp agreement :
After filtration , track tcp Flow get :
It can be seen that ftp Passive mode transfers two files , Again because ftp The protocol transmits a file using a connection , So two ports are opened before and after , Here is how to calculate the open port number :
The following is an example
The open port is 159*256+247 = 40951Now that you know the port for transferring files , Then get these two files out , See what it is .
First look at hello.txt
The open port is 33303, Then filter the port first 33303 Data packets of :
track TCP flow :
Look at the other one ( We can also see from the title flag It must be here ):
save as-> 2.png
see :
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