Secutech DSL WR RIS 330 Cross Site Scripting

`Document Title:  
===============  
Secutech DSL WR RIS 330 - Filter Bypass Vulnerability  
  
  
References (Source):  
====================  
https://www.vulnerability-lab.com/get_content.php?id=1988  
  
  
Release Date:  
=============  
2018-07-09  
  
  
Vulnerability Laboratory ID (VL-ID):  
====================================  
1988  
  
  
Common Vulnerability Scoring System:  
====================================  
3.3  
  
  
Vulnerability Class:  
====================  
Cross Site Scripting - Persistent  
  
  
Current Estimated Price:  
========================  
500a! - 1.000a!  
  
  
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:  
===============  
Medium  
  
  
Authentication Type:  
====================  
Restricted authentication (user/moderator) - User privileges  
  
  
User Interaction:  
=================  
Low User Interaction  
  
  
Disclosure Type:  
================  
Independent Security Research  
  
  
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 (Vulnerability Lab Core Research Team)  
[[email protected]] -  
https://www.vulnerability-lab.com/show.php?user=Lawrence+Amer  
  
  
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=========================  
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