dedecms /member/uploads_edit.php SQL Injection Vul

Andrew.Hann發表於2015-05-21
PHPSQL

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1. 漏洞描述
2. 漏洞觸發條件
3. 漏洞影響範圍
4. 漏洞程式碼分析
5. 防禦方法
6. 攻防思考

 

1. 漏洞描述

Dedecms 5.3版本下的member/uploads_edit.php中的未限制檔案上傳漏洞允許遠端攻擊者通過上傳一個有兩個擴充套件的檔名的檔案，然後藉助未知向量訪問該檔案而執行任意程式碼。這已經通過帶.jpg.php的檔名所證實

Relevant Link:

http://cve.scap.org.cn/CVE-2009-2270.html
http://www.cnnvd.org.cn/vulnerability/show/cv_id/2009070008


2. 漏洞觸發條件

0x1: POC

<form id="frmUpload" enctype="multipart/form-data" action="http://127.0.0.1/dedecms5.5/member/uploads_edit.php?dopost=save&title=ss&oldurl=1'.php" method="post">
<!-- oldurl是注入點 -->
    <input type="file" name="addonfile" id="addonfile" size="50"><br>
    <input name="mode" type="hidden" value="2">
    <input id="btnUpload" type="submit" value="Upload">
</form>

Relevant Link:

http://www.wooyun.org/bug.php?action=view&id=48894
http://www.2cto.com/Article/201012/80026.html


3. 漏洞影響範圍
4. 漏洞程式碼分析

/member/uploads_edit.php

else if($dopost=='save')
{
    $title = HtmlReplace($title,2);
    if($mediatype==1) $utype = 'image';
    else if($mediatype==2)
    {
        $utype = 'flash';
    }
    else if($mediatype==3)
    {
        $utype = 'media';
    }
    else
    {
        $utype = 'addon';
    }
    $title = HtmlReplace($title,2);
    //獲取"."前面的檔名
    $exname = ereg_replace("(.*)/","",$oldurl);
    //獲取"."之外的副檔名
    $exname = ereg_replace("\.(.*)$","",$exname);
    //返回上傳的檔名
    $filename = MemberUploads('addonfile',$oldurl,$cfg_ml->M_ID,$utype,$exname,-1,-1,true);
    //$filename帶入函式查詢
    SaveUploadInfo($title,$filename,$mediatype);
    ShowMsg("成功修改檔案！","uploads_edit.php?aid=$aid");
}

\member\inc\inc_archives_functions.php

function SaveUploadInfo($title,$filename,$medaitype=1,$addinfos='')
{
    global $dsql,$cfg_ml,$cfg_basedir;
    if($filename=='')
    {
        return false;
    }
    if(!is_array($addinfos))
    {
        $addinfos[0] = $addinfos[1] = $addinfos[2] = 0;
    }
    if($medaitype==1)
    {
        $info = '';
        $addinfos = GetImageSize($cfg_basedir.$filename,$info);
    }
    $addinfos[2] = @filesize($cfg_basedir.$filename);
    $row = $dsql->GetOne("Select aid,title,url From `#@__uploads` where url like '$filename' And mid='".$cfg_ml->M_ID."'; ");
    $uptime = time();
    if(is_array($row))
    {
        $query = "Update `#@__uploads` set title='$title',mediatype='$medaitype',
                     width='{$addinfos[0]}',height='{$addinfos[1]}',filesize='{$addinfos[2]}',uptime='$uptime'
                     where aid='{$row['aid']}'; ";
        $dsql->ExecuteNoneQuery($query);
    }
    else
    {
        //$filename未進行過濾就帶入SQL查詢，造成SQL隱碼攻擊
        $inquery = "INSERT INTO `#@__uploads`(title,url,mediatype,width,height,playtime,filesize,uptime,mid)
           VALUES ('$title','$filename','$medaitype','".$addinfos[0]."','".$addinfos[1]."','0','".$addinfos[2]."','$uptime','".$cfg_ml->M_ID."'); ";
        $dsql->ExecuteNoneQuery($inquery);
    }
    return true;
}


5. 防禦方法

/member/uploads_edit.php

else if($dopost=='save')
{
    $title = HtmlReplace($title,2);
    if($mediatype==1) $utype = 'image';
    else if($mediatype==2)
    {
        $utype = 'flash';
    }
    else if($mediatype==3)
    {
        $utype = 'media';
    }
    else
    {
        $utype = 'addon';
    }
    $title = HtmlReplace($title, 2);
    /* 對$oldurl進行有效過濾 */
    $oldurl = HtmlReplace($oldurl);
    /* */
    $exname = preg_replace("#(.*)/#", "", $oldurl);
    $exname = preg_replace("#\.(.*)$#", "", $exname);
    $filename = MemberUploads('addonfile', $oldurl, $cfg_ml->M_ID, $utype,$exname, -1, -1, TRUE);
    SaveUploadInfo($title, $filename, $mediatype);
    ShowMsg("成功修改檔案！", "uploads_edit.php?aid=$aid");
}


6. 攻防思考

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