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             AUSCERT External Security Bulletin Redistribution

                               ESB-2011.0034
    Shibboleth IdP 2.X Single TransientID Mapped to Multiple Principals
                              13 January 2011

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

Product:           Shibboleth IdP 2.X
Publisher:         The Shibboleth Team
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Access Privileged Data -- Existing Account
Resolution:        Patch/Upgrade

Original Bulletin: 
   http://shibboleth.internet2.edu/secadv/secadv_20110113.txt

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Shibboleth IdP 2.X Single TransientID Mapped to Multiple Principals
====================================================================

All current versions of the Shibboleth 2 IdP are vulnerable to a bug 
where, under certain situations, more than one user may be given the 
same transient  ID. This in turn may lead to attribute queries for each 
user mapped to the  same ID returning the attributes for user most 
recently mapped.

Affected Systems
===========
All current versions of the Shibboleth 2 IdP that have disabled session 
IP address checking (which is on by default) and have users whose 
traffic goes through a proxy that changes their IP address after 
authentication but before the SAML response is sent back to the SP.

Deployments using the default value for the 
ensureConsistentClientAddress setting in the IdPSessionFilter declared 
in the IdP's web.xml are *not* affected.

Addressing the Issue
===========
Re-enable Session IP address checking.  This may cause intermittent 
issues with some users (if their IP address changes at the moment 
described above) but is the only way to address the issue for current 
systems.

Shibboleth IdP 2.2.1 contains a fix for this issue that does not require 
re-enabling Session IP address checking.

Credits
===========
Robert Egglestone, Univ. of Auckland

http://shibboleth.internet2.edu/secadv/secadv_20110113.txt

- -- 
Chad La Joie
http://itumi.biz
trusted identities, delivered

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===========================================================================
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