[prev in list] [next in list] [prev in thread] [next in thread]
List: full-disclosure
Subject: [FD] Sophos XG Firewall (SF01V) - Persistent Web Vulnerability
From: Vulnerability Lab <research () vulnerability-lab ! com>
Date: 2016-04-26 14:09:17
Message-ID: 571F768D.3010805 () vulnerability-lab ! com
[Download RAW message or body]
Document Title:
===============
Sophos XG Firewall (SF01V) - Persistent Web Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1734
ID: 5740075
Release Date:
=============
2016-04-25
Vulnerability Laboratory ID (VL-ID):
====================================
1734
Common Vulnerability Scoring System:
====================================
3.5
Product & Service Introduction:
===============================
Sophos XG Firewall provides unprecedented visibility into your network, users, and applications \
right from the all-new control center. You also get rich on-box reporting and the option to \
add Sophos Firewall Manager and iView for centralized management and reporting across multiple \
Firewalls. Displays the real-time status of system performance, services, connections, and \
other system parameters. Green indicates everything is fine, orange indicates a warning, and \
red indicates something needs immediate attention. Each item is clickable to reveal additional \
details and graphs, as well as helpful system and network tools you can use for troubleshooting \
purposes such as ping, trace route, packet capture, command-line access, and much more.
(Copy of the Vendor Homepage: \
https://www.sophos.com/en-us/products/unified-threat-management.aspx )
Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered an application-side validation \
vulnerability in the official Sophos XG Firewall (SF01V) appliance web-application.
Vulnerability Disclosure Timeline:
==================================
2016-02-17: Researcher Notification & Coordination (Lawrence Amer)
2016-02-18: Vendor Notification (Sophos Security Team)
2016-04-25: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
Technical Details & Description:
================================
A persistent cross site scripting web vulnerability has been discoverd in the official Sophos \
XG Firewall (SF01V) appliance web-application. The security issue allows remote attackers to \
inject own malicious script codes on the application-side of the affected service module.
The vulnerability is located in the `Protection - Web Protection - Web Content Filter - \
General Configuration - Override Default Denied Message` module. Remote attackers and low \
privileged web-application user accounts are able to inject own malicious script code context \
as notification value of the Blocked Access Request. The data of the POST method request in \
the nody of message text, executes without a secure encoding or a restriction in the body of \
message in the web-application appliance. The persistent execution of the script code occurs in \
[Default Denied Message] that gets send by the appliances directly to users.
The security risk of the persistent validation vulnerability is estimated as high with a cvss \
(common vulnerability scoring system) count of 3.5. Exploitation of the persistent input \
validation web vulnerability requires a privileged web-application user account and low or \
medium user interaction. Successful exploitation of the vulnerability results in session \
hijacking, persistent phishing, persistent external redirects to malicious source and \
persistent manipulation of affected or connected application modules.
Request Method(s):
[+] POST
Vulnerable Module(s):
[+] Protection - Web Protection - Web Content Filter - General Configuration - Override \
Default Denied Message
Vulnerable Parameter(s):
[+] message body
Proof of Concept (PoC):
=======================
Persistent Web Vulnerability can be exploited by remote attackers with privileged \
web-application user account and low or medium 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. goes to : Protection > Web Protection > Web Content Filter> General Configuration
2. Choose the Override Default Denied Message input field
3. Message HTML Input: [POC]
Note: '><iframe src="http://vulnerability-lab.com" onload=alert(document.cookie)<
4. After saving all users get it as default message of blocked requests as notification message
5. Successful reproduce of the vulnerability!
PoC:
<b><BR><font class=accessdeniedtextfont >This is a message from the IT Department. <BR><BR>The \
web site you are trying to access: '><iframe src="http://vulnerability-lab.com" \
onload=alert(document.cookie)< <BR></font><font class=accessdeniedcategoryfont \
>{url}</font><BR><font class=accessdeniedtextfont >is listed as a site within the category \
> </font><font class=accessdeniedcategoryfont>{category}</font><BR><BR><font \
> class=accessdeniedtextfont > Current Internet Access Configuration for you does not allow \
> visiting sites within this category at this time.<BR><BR>If the website has been erroneously \
> blocked, please <a href="#" class="accessdeniedcategoryfont" \
> onclick="callReevaluationFunction()">submit</a> it for re-evaluation.</font></b>
Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of the vulnerable input field \
context. Encode all inputs and restrict the input by disallowing the usage of special chars.
Parse also the outgoing values for the user notification by the appliance service itself to \
prevent malicious attack scenarios.
Security Risk:
==============
The security risk of the application-side input validation web vulnerability in the sophos xg \
firewall appliance web-application is estimated as medium. (CVSS 3.5)
Credits & Authors:
==================
Lawrence Amer - ( http://www.vulnerability-lab.com/show.php?user=Lawrence%20Amer )
Disclaimer & Information:
=========================
The information provided in this advisory is provided as it is without any warranty. \
Vulnerability Lab disclaims all warranties, either expressed or implied, including the \
warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its \
suppliers are not liable in any case of damage, including direct, indirect, incidental, \
consequential loss of business profits or special damages, even if Vulnerability-Lab or its \
suppliers have been advised of the possibility of such damages. Some states do not allow the \
exclusion or limitation of liability for consequential or incidental damages so the foregoing \
limitation may not apply. We do not approve or encourage anybody to break any vendor licenses, \
policies, deface websites, hack into databases or trade with fraud/stolen material.
Domains: www.vulnerability-lab.com - www.vuln-lab.com - www.evolution-sec.com
Contact: admin@vulnerability-lab.com - research@vulnerability-lab.com - \
admin@evolution-sec.com
Section: magazine.vulnerability-db.com - vulnerability-lab.com/contact.php - \
evolution-sec.com/contact
Social: twitter.com/#!/vuln_lab - facebook.com/VulnerabilityLab - \
youtube.com/user/vulnerability0lab
Feeds: vulnerability-lab.com/rss/rss.php - vulnerability-lab.com/rss/rss_upcoming.php - \
vulnerability-lab.com/rss/rss_news.php
Programs: vulnerability-lab.com/submit.php - \
vulnerability-lab.com/list-of-bug-bounty-programs.php - vulnerability-lab.com/register/
Any modified copy or reproduction, including partially usages, of this file requires \
authorization from Vulnerability Laboratory. Permission to electronically redistribute this \
alert in its unmodified form is granted. All other rights, including the use of other media, \
are reserved by Vulnerability-Lab Research Team or its suppliers. All pictures, texts, \
advisories, source code, videos and other information on this website is trademark of \
vulnerability-lab team & the specific authors or managers. To record, list (feed), modify, use \
or edit our material contact (admin@vulnerability-lab.com or research@vulnerability-lab.com) \
to get a permission.
Copyright © 2016 | Vulnerability Laboratory - [Evolution Security GmbH]â„¢
--
VULNERABILITY LABORATORY - RESEARCH TEAM
SERVICE: www.vulnerability-lab.com
CONTACT: research@vulnerability-lab.com
_______________________________________________
Sent through the Full Disclosure mailing list
https://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: http://seclists.org/fulldisclosure/
[prev in list] [next in list] [prev in thread] [next in thread]
Configure |
About |
News |
Add a list |
Sponsored by KoreLogic