dedecms /member/flink_main.php SQL Injection Vul

Posted 2022-09-02 郑瀚Andrew

dedecms /member/flink_main.php SQL Injection Vul

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1. 漏洞描述
2. 漏洞触发条件
3. 漏洞影响范围
4. 漏洞代码分析
5. 防御方法
6. 攻防思考

 

1. 漏洞描述

会员模块中存在的SQL注入

Relevant Link

http://www.cnseay.com/1959/

 
2. 漏洞触发条件

1. 打开 http://127.0.0.1/dedecms/member/flink_main.php#
2. 在连接网址里面写入 http://sss2),(8,1,@``),(8,(select user()),33333
/*
连接名称随意
这里的8 是你的用户ID 想要查看必须得知道自己的用户id，通过查看cookie里面有一个DedeUserID，就是自己的用户id
*/

Relevant Link:

http://www.wooyun.org/bugs/wooyun-2014-048878

3. 漏洞影响范围
4. 漏洞代码分析

/member/flink_main.php

if($dopost=="addnew")

    AjaxHead();
    $row = $dsql->GetOne("Select count(*) as dd From `#@__member_flink` where mid=".$cfg_ml->M_ID." ");
    if($row[dd]>=50)
    
        echo "<font color=red>增加网址失败，因为已经达到五十个网址的上限！</font>";
        GetLinkList($dsql);
        exit();
    
    //如果前面有http就不过滤了
    if(!eregi("^http://",$url))
    
        $url = "http://".htmlReplace($url, 2);
    
    $title = HtmlReplace($title);
    //$url未经过过滤就带入SQL查询
    $inquery = "INSERT INTO `#@__member_flink`(mid,title,url) VALUES(".$cfg_ml->M_ID.",$title,$url); ";
    $dsql->ExecuteNoneQuery($inquery);
    echo "<font color=red>成功增加一链接！</font>";
    GetLinkList($dsql);
    exit();

5. 防御方法

/member/flink_main.php

if($dopost=="addnew")

    AjaxHead();
    $row = $dsql->GetOne("Select count(*) as dd From `#@__member_flink` where mid=".$cfg_ml->M_ID." ");
    if($row[dd]>=50)
    
        echo "<font color=red>增加网址失败，因为已经达到五十个网址的上限！</font>";
        GetLinkList($dsql);
        exit();
    
    //如果前面有http就不过滤了
    if(!eregi("^http://",$url))
    
        $url = "http://".HtmlReplace($url, 2);
    
    $title = HtmlReplace($title);
    /* $url过滤 */
    $url = HtmlReplace($url);
    /**/
 
    $inquery = "INSERT INTO `#@__member_flink`(mid,title,url) VALUES(".$cfg_ml->M_ID.",$title,$url); ";
    $dsql->ExecuteNoneQuery($inquery);
    echo "<font color=red>成功增加一链接！</font>";
    GetLinkList($dsql);
    exit();

6. 攻防思考

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