Hash: SHA1

             AUSCERT External Security Bulletin Redistribution

                    ESB-2009.0171 -- [Win][UNIX/Linux]
               Shibboleth IdP 2.X cross-site request attack
                             26 February 2009


        AusCERT Security Bulletin Summary

Product:              Shibboleth
Publisher:            The Shibboleth Team
Operating System:     UNIX variants (UNIX, Linux, OSX)
Impact:               Cross-site Request Forgery
Access:               Remote/Unauthenticated

- --------------------------BEGIN INCLUDED TEXT--------------------

Shibboleth IdP 2.X cross-site request attack

All current versions of the Shibboleth 2 IdP are vulnerable to a
cross-site attack during certain error conditions.  Such attacks could
allow attackers to phish credentials, steal active session, or otherwise
intercept user/idp communications.

Affected Systems
All current versions of the Shibboleth 2 IdP.

Addressing the Issue
Within the Shibboleth IdP distribution bundle (the directory structure
created by expanding the downloaded archive from the shibboleth site)
edit the file 'src/main/webapp/error.jsp' and remove the following lines
(lines 20 - 25 in the default file).

       Throwable error = (Throwable)
	   if(error != null){
	<strong>Error Message: <%= error.getMessage() %></strong>
	<% } %>

Then, re-run the installation script (this time answering "no" when
asked if you want to overwrite your existing configuration) and restart
your Servlet container.

All error messages will still be include in the IdP's log file but the
simpler error message will not be displayed to the user.

The next bugfix release of Shibboleth, currently scheduled for release
in 1 - 1.5 weeks, will contain the fix for this issue and re-enable the
display of the simpler error messages.

Mike Suvanto, from CSC, for finding the bug

- -- 
The Shibboleth Team

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