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             AUSCERT External Security Bulletin Redistribution

               Shibboleth IdP 2.X cross-site request attack
                               6 April 2010


        AusCERT Security Bulletin Summary

Product:           Shibboleth 2 IdP
Publisher:         The Shibboleth Team
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Cross-site Scripting -- Remote/Unauthenticated
Resolution:        Mitigation

Reference:         ESB-2009.1480

Original Bulletin: 

- --------------------------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 

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.

Shibboleth IdP 2.2.0 will contain the fix for this issue and allow
re-enablement of display error messages.

Mike Suvanto, from CSC, for finding the bug

- --------------------------END INCLUDED TEXT--------------------

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The University of Queensland
Qld 4072

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