Discuz! 7.1 & 7.2

产生漏洞的$scriptlang数组在安装插件后已经初始化Discuz！新版本7.1与7.2版本中的showmessage函数中eval中执行的参数未初始化，可以任意提交，从而可以执行任意PHP命令。下面来分析下这个远程代码执行漏洞，这个问题真的很严重，可以直接写shell的：一、漏洞来自showmessage函数：function showmessage($message, $url_forward = '', $extra = '', $forwardtype = 0) {     extract($GLOBALS, EXTR_SKIP);//危险的用法，未初始化的变量可以直接带进函数，直接导致了问题产生，from www.oldjun.com     global $hookscriptmessage, $extrahead, $discuz_uid, $discuz_action, $debuginfo, $seccode, $seccodestatus, $fid, $tid, $charset, $show_message, $inajax, $_DCACHE, $advlist;     define('CACHE_FORBIDDEN', TRUE);     $hookscriptmessage = $show_message = $message;$messagehandle = 0;     $msgforward = unserialize($_DCACHE['settings']['msgforward']);     $refreshtime = intval($msgforward['refreshtime']);     $refreshtime = empty($forwardtype) ? $refreshtime : ($refreshtime ? $refreshtime : 3);     $msgforward['refreshtime'] = $refreshtime * 1000;     $url_forward = empty($url_forward) ? '' : (empty($_DCOOKIE['sid']) && $transsidstatus ? transsid($url_forward) : $url_forward);     $seccodecheck = $seccodestatus & 2;     if($_DCACHE['settings']['funcsiteid'] && $_DCACHE['settings']['funckey'] && $funcstatinfo && !IS_ROBOT) {         $statlogfile = DISCUZ_ROOT.'./forumdata/funcstat.log';         if($fp = @fopen($statlogfile, 'a')) {             @flock($fp, 2);             if(is_array($funcstatinfo)) {                 $funcstatinfo = array_unique($funcstatinfo);                 foreach($funcstatinfo as $funcinfo) {                     fwrite($fp, funcstat_query($funcinfo, $message)."\n");                 }             } else {                 fwrite($fp, funcstat_query($funcstatinfo, $message)."\n");             }             fclose($fp);             $funcstatinfo = $GLOBALS['funcstatinfo'] = '';         }     }     if(!defined('STAT_DISABLED') && STAT_ID > 0 && !IS_ROBOT) {         write_statlog($message);     }     if($url_forward && (!empty($quickforward) || empty($inajax) && $msgforward['quick'] && $msgforward['messages'] && @in_array($message, $msgforward['messages']))) {         updatesession();         dheader("location: ".str_replace('&', '&', $url_forward));     }     if(!empty($infloat)) {         if($extra) {             $messagehandle = $extra;         }         $extra = '';     }     if(in_array($extra, array('HALTED', 'NOPERM'))) {         $discuz_action = 254;     } else {         $discuz_action = 255;     }     include language('messages');     $vars = explode(':', $message);//只要含:就可以了     if(count($vars) == 2 && isset($scriptlang[$vars[0]][$vars[1]])) {//两个数字即可，用:分割         eval("\$show_message = \"".str_replace('"', '\"', $scriptlang[$vars[0]][$vars[1]])."\";");//$scriptlang未初始化，可以自定义，from www.oldjun.com     } elseif(isset($language[$message])) {         $pre = $inajax ? 'ajax_' : '';         eval("\$show_message = \"".(isset($language[$pre.$message]) ? $language[$pre.$message] : $language[$message])."\";");         unset($pre);     }     ......} 二、DZ的全局机制导致了未初始化的参数可以任意提交：foreach(array('_COOKIE', '_POST', '_GET') as $_request) {     foreach($$_request as $_key => $_value) {         $_key{0} != '_' && $$_key = daddslashes($_value);     }} 三、misc.php正好有个可以自定义message的点，其实也是未初始化：elseif($action == 'imme_binding' && $discuz_uid) {     if(isemail($id)) {         $msn = $db->result_first("SELECT msn FROM {$tablepre}memberfields WHERE uid='$discuz_uid'");         $msn = explode("\t", $msn);         $id = dhtmlspecialchars(substr($id, 0, strpos($id, '@')));         $msn = "$msn[0]\t$id";         $db->query("UPDATE {$tablepre}memberfields SET msn='$msn' WHERE uid='$discuz_uid'");         showmessage('msn_binding_succeed', 'memcp.php');     } else {         if($result == 'Declined') {             dheader("Location: memcp.php");         } else {             showmessage($response['result']);//$response没有初始化，可以自定义，from www.oldjun.com         }     }    } 

更新内容:修复版本存在的重要安全问题修复版本中存在的其他使用 bug安全级别：     高涉及版本：Discuz! 7.1 , Discuz! 7.2修补方法:1. 根据您的版本下载补丁包7.1 用户 http://download2.comsenz.com/Discuz/patch/7.1/D710_UPGRADE_TO_20100110.zip7.2 用户 http://download2.comsenz.com/Discuz/patch/7.2/D720_UPGRADE_TO_20100110.zip2. 解压缩文件3. 上传upload目录中的所有文件到您的论坛, 覆盖原有程序4. 修复完成注意事项:下目录中包含有相应版本的以往的补丁文件, 如果您尚未修复, 您应当按照补丁发布的时间, 依次覆盖修复http://download2.comsenz.com/Discuz/patch/7.1/http://download2.comsenz.com/Discuz/patch/7.2/