# \[极客大挑战 2020]Roamphp6-flagshop
1. 注册账号并登陆
2. 发现可以购买Flag，但是余额不足
3. 发现存在转账功能
4. 发现可以提交报告，并且提示管理员会查看
5. 猜测可能存在CSRF
6. BP抓包转账数据，生成POC
添加js自动提交：
```html
```
1. 把POC部署到服务器上
2. 提交报告验证码计算
```js
md5($code)[0:5] == 01a2e
```
自动计算：
```python
# -*- coding: UTF-8 -*-
import hashlib
def getMd5(index):
for i in range(100000, 100000000):
x = i
md5 = hashlib.md5(str(x).encode("utf8")).hexdigest()
if md5[0:5] == index:
return x
print(getMd5("a368a"))
```
1. 报告内容填POC地址
---
# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://truda.gitbook.io/ctf-writeup/buuctf/ji-ke-da-tiao-zhan-2020roamphp6flagshop.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.