易思espcms后台功能绕过[可直接利用后台sql注入]

简要描述：

后台功能绕过，后台存在sql注入
结合绕过漏洞，进行sql注入

详细说明：

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，

加密前：1|2|3|e0b858f1249c7bbe85c69dcf5eaac720|5|6|fae169abd4e73eb55567e2a202526274

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

漏洞证明：

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，htmlspecial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