后台功能绕过，后台存在sql注入
结合绕过 漏洞 ，进行sql注入
本地测试使用默认的adminsoft为后台目录，使用类的构造函数验证用户的后台访问权限
后台各功能都为模版类important，该类构造函数如下：
function important() {
$this->softbase(true);
}
该类为继承类，跟进父类，文件/public/class_connector.php中第14行
function softbase($admin_purview = false) { header("Content-Type: text/html; charset=utf-8"); $this->dbmysql(); $this->commandinc(); $this->systemfile(); $this->cachedb(); if ($admin_purview) { $this->admin_purview(); $this->sitelng = $this->getlng(); $action = $this->fun->accept('action', 'R'); if (in_array($action, $this->esp_powerlist) && !in_array('all', $this->esp_powerlist)) { exit('Permissions errors'); } }…………………………
判断管理权限主要为代码$this->admin_purview();，跟进在该文件第330行如下：
function admin_purview() { if ($this->fun->accept('archive', 'R') == 'filemanage' && $this->fun->accept('action', 'R') == 'batupfilesave') { $ecisp_admininfo = $this->fun->accept('ecisp_admininfo', 'G'); $esp_powerlist = $this->fun->accept('esp_powerlist', 'G'); $gettype = false; } else { $ecisp_admininfo = $this->fun->accept('ecisp_admininfo', 'C'); $esp_powerlist = $this->fun->accept('esp_powerlist', 'C'); $gettype = true; } $arr_purview = explode('|', $this->fun->eccode($ecisp_admininfo, 'DECODE', db_pscode)); $this->esp_powerlist = explode('|', $this->fun->eccode($esp_powerlist, 'DECODE', db_pscode)); list($this->esp_adminuserid, $this->esp_username, $this->esp_password, $this->esp_useragent, $this->esp_powerid, $this->esp_inputclassid, $this->esp_softurl) = $arr_purview; if ($gettype) { if (empty($this->esp_username) || empty($this->esp_adminuserid) || md5(admin_AGENT) != $this->esp_useragent || md5(admin_ClassURL) != $this->esp_softurl) { $condition = 0; } else { $condition = 1; } } else { if (empty($this->esp_username) || empty($this->esp_adminuserid) || md5(admin_ClassURL) != $this->esp_softurl) { $condition = 0; } else { $condition = 1; } } if ($condition == 0) { if ($this->fun->accept('archive', 'R') != 'adminuser' && $this->fun->accept('action', 'R') != 'login') { header('location: index.php?archive=adminuser&action=login'); exit(); } } else { if ($condition == 1 && $this->fun->accept('point', 'R') == '' && $this->fun->accept('archive', 'R') == '' && $this->fun->accept('action', 'R') == '') { header('location: index.php?archive=management&action=tab&loadfun=mangercenter&out=tabcenter'); exit(); } } }
跟上一个问题差不多，获取cookie里面的字段ecisp_admininfo，然后解密赋值，也就是说只要保证代码if (empty($this->esp_username) || empty($this->esp_adminuserid) || md5(admin_AGENT) != $this->esp_useragent || md5(admin_ClassURL) != $this->esp_softurl)不成立，则可以绕过逻辑验证，访问后台功能函数。
admin_AGENT和admin_ClassURL又为预定义数据，
define('admin_AGENT', $_SERVER['HTTP_USER_AGENT']);
define('admin_ClassURL', 'http://' . $_SERVER['HTTP_HOST'] . substr($_SERVER['PHP_SELF'], 0, strrpos($_SERVER['PHP_SELF'], '/')));
由此可以伪造对应的cookie字段ecisp_admininfo，我这里使用火狐 浏览器 ，
内置加密函数加密一下：ZLCTsWitnWeabWVqy2WTZ5_IbciYyGqXm2tsmMSbapaZmJtsYmLhad1p4suXy2eZa8OamWeZmGiak21sbWtnl5eVk2OYmmicaJpm
添加这个cookie字段后可以绕过限制，访问任意函数了
下面我演示一下通过此漏洞利用后台文件adminsoft/control/acmessagemain.php的sql注入
文件/adminsoft/control/acmessagemain.php 第52行到63行
$limitkey = $this->fun->accept('limitkey', 'R'); $limitkey = empty($limitkey) ? 'dmid' : $limitkey; $limitclass = $this->fun->accept('limitclass', 'R'); $limitclass = empty($limitclass) ? 'DESC' : $limitclass; $db_table = db_prefix . 'document_message'; if (!empty($countnum)) { $countnum = $this->db_numrows($db_table, $db_where); exit($countnum); } $sql = 'SELECT * FROM ' . $db_table . $db_where . ' ORDER BY ' . $limitkey . ' ' . $limitclass . ' LIMIT ' . $MinPageid . ',' . $MaxPerPage; $rs = $this->db->query($sql);
$limitkey直接通过$this->fun->accept('limitkey', 'R');获取未做处理，该函数默认进行gpc， html special过滤，由于此处不在引号内部，可直接忽略上述处理，
我这里不登陆直接添加上述cookie字段后，打印一下sql语句吧，
修复方案： 先修复判断判断
再修复sql注入
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