full-disclosure - [FD] cWifi Hotspot Wireless CP

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Message-ID: <8b043904-6a55-10e6-0dcd-446199778996@vulnerability-lab.com>
Date: Wed, 5 Jan 2022 11:41:57 +0100
From: "info@...nerability-lab.com" <info@...nerability-lab.com>
To: fulldisclosure@...lists.org
Subject: [FD] cWifi Hotspot Wireless CP - Code Execution Vulnerability

Document Title:
===============
cWifi Hotspot Wireless CP - Code Execution Vulnerability

References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2310

Release Date:
=============
2021-12-15

Vulnerability Laboratory ID (VL-ID):
====================================
2310

Common Vulnerability Scoring System:
====================================
8.2

Vulnerability Class:
====================
Code Execution

Current Estimated Price:
========================
2.000€ - 3.000€

Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered code execution vulnerability in the cWifi Hotspot Wireless Captive Portal.

Affected Product(s):
====================
Product: cWifi Hotspot Wireless Captive Portal -  (PHP) (Web-Application)

Vulnerability Disclosure Timeline:
==================================
2021-12-15: Public Disclosure (Vulnerability Laboratory)

Discovery Status:
=================
Published

Exploitation Technique:
=======================
Remote

Severity Level:
===============
High

Authentication Type:
====================
Restricted Authentication (Guest Privileges)

User Interaction:
=================
No User Interaction

Disclosure Type:
================
Independent Security Research

Technical Details & Description:
================================
A code execution vulnerability has been discovered in the official cWifi Hotspot wireless captive portal web-application.
The vulnerability is located in the login status post method request for the spot-cwifi. Remote attackers are able to inject own malicious ip and
mac adress credentials in the post method data request. that results in several different typ of vulnerabilities in connection to the phpsessionid.
Attackers are able to provoke client-side script code execution via mac or ip parameter in the status post method request. Thus allows the attacker
to gain access to the victims wifi connection and session credentials to access. The issue can be process by a full remote attacker after connecting
as guest or member to the wifi. The parameter in the post method request are no sanitized correctly and results in a client-side execution.

Request Method(s):
[+] POST

Vulnerable Module(s):
[+] /v2/
[+] /logout

Vulnerable File(s):
[+] status.php

Vulnerable Parameter(s):
[+] ip
[+] mac
[+] adress

Proof of Concept (PoC):
=======================
The critical code execution vulnerability can be exploited by remote attackers with guest access or by authenticated user accounts.
For security demonstration or to reproduce the web vulnerability follow the provided information and steps below to continue.

Vulnerable Source: status.php (v2/status.php -http://spot.cwifi.de/status)
</head>
<body>
<div class="container-fluid">
<br><br>	
<div class="row">
<div class="col-md-4"></div>
<div class="col-md-4">
<form data-ajax="false" action='/v2/status.php?PHPSESSID=06u1m6qlhcp4tbuuapnq8du5c7' method="post">
<p><span class="zwischenh1gelb gelb bold">MAC-Adresse: <[MALICIOUS INJECTED CODE EXECUTION!]></span></span>
</span>
<span class="bold">IP Adresse:</span><[MALICIOUS INJECTED CODE PAYLOAD EXECUTION!]></p>
<p><span class="bold">Bytes up/down:</span>7.2 MiB/ 221.6 MiB</p>
<p><span class="bold">Session time:</span>7m56s</p>
<p><br>
<button name="ABMELDEN" type="submit" class="btn btn-primary btn-lg btn-block">abmelden</button>
<button name="DELETE" type="submit" class="btn btn-danger btn-lg btn-block">abmelden und Daten löschen</button>
</p>
</form>
<div class="col-md-4"></div>
</div>	</div>	
</body>
</html>
-- logout status
<td valign="middle" align="center">
<b>you have just logged out</b> <br><br>
<table class="tabula" border="1">
<tbody><tr><td align="right">user name</td><td><[MALICIOUS INJECTED CODE PAYLOAD EXECUTION!]></td></tr>
<tr><td align="right">IP address</td><td><[MALICIOUS INJECTED CODE PAYLOAD EXECUTION!]></td></tr>
<tr><td align="right">MAC address</td><td><[MALICIOUS INJECTED CODE PAYLOAD EXECUTION!]></td></tr>
<tr><td align="right">session time</td><td>4m12s</td></tr>
<tr><td align="right">time left</td><td>23h55m48s</td></tr>
<tr><td align="right">bytes up/down:</td><td>49.1 KiB / 169.2 KiB</td></tr>
</tbody></table>
<br>
<form action="http://spot.cwifi.de/login"  name="login" onsubmit="return openLogin()">
<input type="submit" value="log in">
</form>
</td>

--- PoC Session Logs (POST) ---
POST /v2/status.php HTTP/1.1
Host: hotspot.cwifi.de
Content-Length: 1129
Cache-Control: max-age=0
Sec-Ch-Ua: "Chromium";v="93", " Not;A Brand";v="99"
Sec-Ch-Ua-Mobile: ?0
Sec-Ch-Ua-Platform: "Windows"
Upgrade-Insecure-Requests: 1
Origin:http://spot.cwifi.de
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 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=0.9
Sec-Fetch-Site: cross-site
Sec-Fetch-Mode: navigate
Sec-Fetch-Dest: document
Referer:http://spot.cwifi.de/
Accept-Encoding: gzip, deflate
Accept-Language: de-DE,de;q=0.9,en-US;q=0.8,en;q=0.7
Connection: close
-
hostname=spot.cwifi.de&identity=Client2822&login-by=http-pap&plain-passwd=yes&server-address=<[MALICIOUS INJECTED CODE!]>%3A80&ssl-login=no
&server-name=Client2822_HotSpot&link-login=http%3A%2F%2Fspot.cwifi.de%2Flogin&link-login-only=http%3A%2F%2Fspot.cwifi.de%2Flogin
&link-logout=http%3A%2F%2Fspot.cwifi.de%2Flogout&link-status=http%3A%2F%2Fspot.cwifi.de%2Fstatus&link-orig=
&domain=&interface-name=2_HotSpotA&ip=<[MALICIOUS INJECTED CODE!]>&logged-in=yes&mac=<[MALICIOUS INJECTED CODE!]>&trial=no&username=90%3ACC%3ADF%3A96%3AF6%3A59
&host-ip=<[MALICIOUS INJECTED CODE!]>&idle-timeout=5h&idle-timeout-secs=18000&limit-bytes-in=&limit-bytes-out=&refresh-timeout=1m&refresh-timeout-secs=60
&session-timeout=23h52m4s&session-timeout-secs=85924&session-time-left=23h52m4s&session-time-left-secs=85924&uptime=7m56s&uptime-secs=476
&bytes-in=7591511&bytes-in-nice=7.2+MiB&bytes-out=232391459&bytes-out-nice=221.6+MiB&packets-in=154484&packets-out=172963&remain-bytes-in=
&remain-bytes-out=&session-id=&var=&error=&error-orig=&chap-id=%24%28chap-id%29&chap-challenge=%24%28chap-challenge%29&popup=%24%28popup%29
&advert-pending=no&http-status=%24%28http-status%29&http-header=%24%28http-header%29
-
HTTP/1.1 200 OK
Server: Apache/2.4.18 (Ubuntu)
Set-Cookie: PHPSESSID=06u1m6qlhcp4tbuuapnq8du5c7; path=/
Cache-Control: no-store, no-cache, must-revalidate
Vary: Accept-Encoding
Content-Length: 2137
Connection: close
Content-Type: text/html; charset=UTF-8
-- via Login
https://hotspot.cwifi.de/v2/login.php
Host: hotspot.cwifi.de
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate, br
Content-Type: application/x-www-form-urlencoded
Content-Length: 1078
Origin:http://spot.cwifi.de
Connection: keep-alive
Referer:http://spot.cwifi.de/
Cookie: PHPSESSID=tvpvp06jktbs8hvgm8efh1eh33
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: cross-site
phone=&hostname=spot.cwifi.de&identity=Client2822&login-by=&plain-passwd=yes&server-address=<[MALICIOUS INJECTED CODE!]>:80&ssl-login=no&server-name=Client2822_HotSpot
&link-login=http://spot.cwifi.de/login&link-login-only=http://spot.cwifi.de/login&link-logout=http://spot.cwifi.de/logout&link-status=http://spot.cwifi.de/status
&link-orig=&domain=&interface-name=2_HotSpotA&ip=<[MALICIOUS INJECTED CODE!]>&logged-in=no&mac=<[MALICIOUS INJECTED CODE!]>&trial=no&username=
&host-ip=<[MALICIOUS INJECTED CODE!]>&idle-timeout=&idle-timeout-secs=0
&limit-bytes-in=&limit-bytes-out=&refresh-timeout=&refresh-timeout-secs=0&session-timeout=&session-timeout-secs=0&session-time-left=&session-time-left-secs=0
&uptime=0s&uptime-secs=0&bytes-in=0&bytes-in-nice=0 B&bytes-out=0&bytes-out-nice=0 B&packets-in=0&packets-out=0&remain-bytes-in=&remain-bytes-out=&session-id=
&var=&error=&error-orig=&chap-id=244&chap-challenge=2765623021030016220234114113331227527435520051
&popup=true&advert-pending=no&http-status=$(http-status)&http-header=$(http-header)
-
POST: HTTP/1.1 200 OK
Server: Apache/2.4.18 (Ubuntu)
Cache-Control: no-store, no-cache, must-revalidate
Vary: Accept-Encoding
Content-Encoding: gzip
Content-Length: 334
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8

Security Risk:
==============
The security risk of the code execution web vulnerability that allows to attack by multiple vectors to compromise the wifi is estimated as high.

Credits & Authors:
==================
Vulnerability-Lab -https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab

Disclaimer & Information:
=========================
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