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AUSCERT External Security Bulletin Redistribution
ESB-2010.0320
Shibboleth IdP 2.X cross-site request attack
6 April 2010
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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:
http://shibboleth.internet2.edu/secadv/secadv_20090224.txt
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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)
request.getAttribute(AbstractErrorHandler.ERROR_KEY);
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.
Credits
===========
Mike Suvanto, from CSC, for finding the bug
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If you believe that your computer system has been compromised or attacked in
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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)
AusCERT personnel answer during Queensland business hours
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On call after hours for member emergencies only.
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