delphi-status

gistfile1.txt

#Antichat

import urllib2

def get_ciphertext(p):
	assert(len(p) <= 16)

	p += '#' * (16-len(p))

	plain2 = int("echo \"This is a ".encode('hex'), 16)
	iv = 0x1244112edbf81e9b37849824eccf92f1
	d = '7f17510921b23bcdca5e06d3ac4baee60ea5abc1f309eca3bfb3c5a2b5c54e53f65fd11502c1efed53c8f239ab12f40d2b3b108e161fa09afedb7b462f02981b9cfbd7ce571fe73fe5514bb97835c7c5469c7e1d0df5bc58170e0c7c26340e27'

	return hex(int(p.encode('hex'), 16) ^ iv ^ plain2)[2:-1].rjust(32, '0') + d


cmd = 'cat flag.txt;'
print get_ciphertext(cmd);
print urllib2.urlopen('http://delphi-status-e606c556.ctf.bsidessf.net/execute/' + get_ciphertext(cmd)).read()