CSAW CTF 2014 Bin300(1) wololo

log.txt

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)

Valid! flag{Small Group of Helpless Villages? Call in the Trebuchets.}

wololo.py

from pwn import *

s = remote('54.164.98.39', 2510)

print s.recv(1024)

#header
data = p32(0x4F4C4F57) #magic
data += p32(1) #version
data += p16(4) #col
data += p16(4) #row

# col header
data += p8(5)
data += 'USERNAME' + '\0' * (16 - 8)
data += p8(6)
data += 'PASSWORD' + '\0' * (16 - 8)
data += p8(0)
data += 'ADMIN' + '\0' * (16 - 5)
data += p8(0)
data += 'ISAWESOME' + '\0' * (16 - 9)

# data
row = ''
row += 'captainfalcon' + '\0' * (16 - 13)
row += 'fc03329505475dd4be51627cc7f0b1f1'
row += p8(1)
row += p8(1)

data += row * 4

s.send(p32(len(data)) + data)

print s.recv(1024)