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             AUSCERT External Security Bulletin Redistribution

       Shibboleth Identity Provider Security Advisory [18 July 2011]
                               19 July 2011


        AusCERT Security Bulletin Summary

Product:          Shibboleth IdP v2.1.0 and later
Publisher:        Shibboleth
Operating System: Windows
                  UNIX variants (UNIX, Linux, OSX)
Impact/Access:    Provide Misleading Information -- Existing Account
Resolution:       Patch/Upgrade

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Shibboleth Identity Provider Security Advisory [18 July 2011]

Mult-Session Information Leakage
In order to carry environmental information (e.g., IP address) not
directly linked to a user's identity but available only at
authentication time some sites have developed custom login handlers that
place this additional information in the user's session.  This
information is then, often, retrieved by the attribute resolver and used
in some manner.

If a user logs in to the IdP from multiple user-agents, and thus
establishes multiple, concurrent sessions and the service provider
queries for attributes about the user, only the information from the
first established session will be available to the resolver.

As an example, if the IP address of the client is stored in the first
session and the user then logs in from a different user agent with a
different IP address only the initial IP address will be visible during
an attribute query.

Affected Versions
Shibboleth IdP v2.1.0 and later

Do not use attribute queries in conjunction with session information
that is not directly tied to user authentication.  Instead, consider
pushing attributes during SSO.

Manuel Haim, Philipps-Universität Marburg

URL for this Security Advisory:

- -- 
Chad La Joie
trusted identities, delivered

- --

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