Category: Reverse Engineering Points: 300 Description:
nc 54.164.98.39 2510Written by RyanWithZombies
Hint:
typedef struct { uint32_t magic; uint32_t version; uint16_t num_cols; uint16_t num_rows; } header_t; typedef struct { uint8_t type; char name[16]; } col_t; /* * Column types: * * 0 = 8bit integer * * 1 = 16bit integer * * 2 = 32bit integer * * 3 = 64bit integer * * 4 = 8byte string * * 5 = 16byte string * * 6 = 32byte string * * 7 = unix timestamp encoded as a 32bit integer * */
Let’s run the command provided in the challenge description.
$ nc 54.164.98.39 2510
I'm ready to accept your input file!
Run this with: python wololo_x.py hostname port file_to_submit
#!/usr/bin/env python
import sys, socket, struct
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((sys.argv[1], int(sys.argv[2])))
print s.recv(1024)
contents = open(sys.argv[3], "rb").read()
s.send(struct.pack("<I", len(contents)) + contents)
print "The challenge server says: ", s.recv(1024)Okay, let’s store the above Python script to a file named wololo_x.py and try to submit a random test file to the server:
$ python wololo_x.py 54.164.98.39 2510 some-random-test-fileThe server responds:
The challenge server says: Sorry, your file did not pass all the checks.
(TODO)