S21SEC-020 - Vignette user enumeration

[S21SEC <vul-serv () s21sec com>]

###############################################################
ID: S21SEC-020-en
Title: Vignette user enumeration
Date: 15/03/2003
Status: Vendor contacted and solution available
Scope: Enumeration of user status
Platforms: All
Author: rpinuaga
Location: http://www.s21sec.com/es/avisos/s21sec-020-en.txt
Release: External
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                                S 2 1 S E C

                           http://www.s21sec.com

                         Vignette user enumeration


About Vignette
--------------

Vignette develops Content Management and Application Portal Software.


Description of vulnerability
----------------------------

The default login template, commonly located at /vgn/login, used in Vignette for user authentication, permits external 
attackers to enumerate valid accounts names on the system. 

The response given by this template, varies if the user exists, if the user doesn't exists or if the account is 
disabled.

This leads to know the status of each username and to launch brute force attacks to obtain the list of the valid user 
accounts.


Affected Versions and platforms
-------------------------------

This vulnerability has been tested in Vignette StoryServer 5 and Vignette V/5. But it seems that all currently 
avaliable versions are vulnerable.


Solution
--------

Modify the /vgn/login template to avoid the explicit error messages for authentication.
Vignette users should procceed to contact vignette throught the standard channels VOLS etc in order to get a solution.

Additional information
----------------------

These vulnerabilities have been found and researched by:

 Ramon Pinuaga Cascales         rpinuaga () s21sec com

You can find the last version of this warning in:

        http://www.s21sec.com/es/avisos/s21sec-020-en.txt

And other S21SEC warnings in http://www.s21sec.com/es/avisos/