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ESB-2009.1390 - [Win][UNIX/Linux] Shared Sign On (Drupal third-party module): Multiple vulnerabilities

Date: 12 October 2009

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2009.1390
        SA-CONTRIB-2009-069 - Shared Sign On - Cross Site Scripting
                              12 October 2009

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Shared Sign On (Drupal third-party module)
Publisher:         Drupal
Operating System:  UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Cross-site Request Forgery -- Remote with User Interaction
                   Unauthorised Access        -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2009-3656 CVE-2009-3657 

Original Bulletin: 
   http://drupal.org/node/592488

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SA-CONTRIB-2009-069 - Shared Sign On - Cross Site Scripting
Security advisories for contributed projects
Drupal Security Team - September 30, 2009 - 20:49

    * Advisory ID: DRUPAL-SA-CONTRIB-2009-069
    * Project: Shared Sign On (third-party module)
    * Version: 5.x, 6.x
    * Date: 2009 September 30
    * Security risk: Critical
    * Exploitable from: Remote
    * Vulnerability: Multiple vulnerabilities

Description

The Shared Sign On module enables users to log into one Drupal site and be 
automatically logged into multiple related Drupal sites.

The module suffers multiple vulnerabilities, including Cross Site Request 
Forgeries (CSRF) and Session fixation problem (Session Fixation). This problem 
allows an attacker to hijack the account of a logged in user by tricking them 
into visiting a seemingly innocent page.

Versions affected

    * Versions of Shared Sign On for both Drupal 5.x and Drupal 6.x

Drupal core is not affected. If you do not use the contributed Shared Sign On 
module, there is nothing you need to do.

Solution

The Shared Sign On module is marked as un-supported. A separate project called 
Single Sign On has been created as a replacement. Download the Single Sign On 
module and carefully read the README.txt as there is a risk of breaking a site 
if instructions are not carried out correctly.

Reported by

    * Reported by Jose A. Reyero and Steven Wittens.

Fixed by

    * Fixed by Steven Wittens of Strutta Inc. and Jakub Suchy of Drupal Security 
team and Heine Deelstra of Drupal Security Team.

Contact

The security contact for Drupal can be reached at security at drupal.org or via 
the form at http://drupal.org/contact.

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
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                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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