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. "/plus/download.php"文件会引入"/include/common.inc.php"文件2. "/include/common.inc.php"中会对用户输入的变量进行"变量本地注册"，如果注册的变量未被显式地初始化，则会导致本地变量覆盖3. "/include/common.inc.php"会引入"/include/dedesql.class.php"文件4. 存在漏洞的"/include/dedesql.class.php"，"没有"对$arrs1、$arrs2这两个数组进行初始化，导致黑客可以通过外部的输入覆盖这2个变量5. 黑客通过向"/plus/download.php"文件中POST入特殊构造的数据包，通过覆盖$arrs1、$arrs2这两个数组，最终污染"数据表前缀变量$cfg_"，这个"数据表前缀变量$cfg_"会被带入数据库的SQL查询语句中，导致SQL注入6. "/plus/ad_js.php"、"/plus/mytag_js.php"会从数据库中查询出刚才被注入的PHP Code，将写过写入缓存文件中，并include执行，最终导致代码执行

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1. "/include/dedesql.class.php"，"没有"对$arrs1、$arrs2这两个数组进行初始化2. "/plus/ad_js.php"、"/plus/mytag_js.php"未对从数据库查询出的数据进行有效过滤、检测

1. DedeCMS v5.72. <= DedeCMS v5.7

/* */ $arrs1 = array();$arrs2 = array();//特殊操作if(isset($GLOBALS[‘arrs1‘])){    $v1 = $v2 = ‘‘;    for($i=0;isset($arrs1[$i]);$i++)    {        $v1 .= chr($arrs1[$i]);    }    for($i=0;isset($arrs2[$i]);$i++)    {        $v2 .= chr($arrs2[$i]);    }    $GLOBALS[$v1] .= $v2;}/* */

...function find_ad_payload($adbody, $aid){    global $db;    $express = "/<\?(php){0,1}(.*)/i";    if (preg_match($express, $adbody))     {          $sql = " DELETE from `#@__myad` WHERE aid=‘$aid‘ ";        $rs = $db->ExecuteNoneQuery($sql);         if( file_exists(DEDEDATA . ‘/cache/myad-‘.$aid.‘.htm‘) )        {            @unlink(DEDEDATA.‘/cache/myad-‘.$aid.‘.htm‘);        }        die("Request Error!");      }  }if(isset($arcID)) $aid = $arcID;$arcID = $aid = (isset($aid) && is_numeric($aid)) ? $aid : 0;if($aid==0) die(‘ Request Error! ‘);$cacheFile = DEDEDATA.‘/cache/myad-‘.$aid.‘.htm‘;if( isset($nocache) || !file_exists($cacheFile) || time() - filemtime($cacheFile) > $cfg_puccache_time ){    $row = $dsql->GetOne("SELECT * FROM `#@__myad` WHERE aid=‘$aid‘ ");    $adbody = ‘‘;    if($row[‘timeset‘]==0)    {        $adbody = $row[‘normbody‘];    }    else    {        $ntime = time();        if($ntime > $row[‘endtime‘] || $ntime < $row[‘starttime‘]) {            $adbody = $row[‘expbody‘];        } else {            $adbody = $row[‘normbody‘];        }    }    find_ad_payload($adbody, $aid);    ...

...function find_tag_payload($tagbody, $aid){    global $db;    $express = "/<\?(php){0,1}(.*)/i";    if (preg_match($express, $tagbody))     {          $sql = " DELETE from `#@__mytag` WHERE aid=‘$aid‘ ";        $rs = $db->ExecuteNoneQuery($sql);         if( file_exists(DEDEDATA . ‘/cache/mytag-‘.$aid.‘.htm‘) )        {            @unlink(DEDEDATA.‘/cache/mytag-‘.$aid.‘.htm‘);        }        die("Request Error!");      }  }if(isset($arcID)) $aid = $arcID;$arcID = $aid = (isset($aid) && is_numeric($aid)) ? $aid : 0;if($aid==0) die(" document.write(‘Request Error!‘); ");$cacheFile = DEDEDATA.‘/cache/mytag-‘.$aid.‘.htm‘;//die(var_dump($cacheFile));if( isset($nocache) || !file_exists($cacheFile) || time() - filemtime($cacheFile) > $cfg_puccache_time ){     $pv = new PartView();    $row = $pv->dsql->GetOne(" SELECT * FROM `#@__mytag` WHERE aid=‘$aid‘ ");    if(!is_array($row))    {        $myvalues = "<!--\r\ndocument.write(‘Not found input!‘);\r\n-->";    }    else    {        $tagbody = ‘‘;        if($row[‘timeset‘]==0)        {            $tagbody = $row[‘normbody‘];        }        else        {            $ntime = time();            if($ntime>$row[‘endtime‘] || $ntime < $row[‘starttime‘]) {                $tagbody = $row[‘expbody‘];            }            else {                $tagbody = $row[‘normbody‘];            }        }        find_tag_payload($tagbody, $aid);        $pv->SetTemplet($tagbody, ‘string‘);    ...