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AUSCERT External Security Bulletin Redistribution
Shibboleth Service Provider: Denial of Service
27 August 2009
AusCERT Security Bulletin Summary
Product: Shibboleth Service Provider
Publisher: The Shibboleth Team
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote/Unauthenticated
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Shibboleth Service Provider Security Advisory [26 August 2009]
An updated version of the Shibboleth 1.3 Service Provider
software, and the XMLTooling library from the 2.x Service
Provider, are now available which correct a security issue.
Shibboleth SP software improperly handles malformed URLs
The Shibboleth software includes code to encode and decode URL
information, and has been shown to crash on certain malformed
encoded URLs due to a buffer overrun.
The crash represents a Denial of Service threat, and as with
most buffer issues could present a future threat for code
injection. No specific attack of this nature is known, but one
Sites using 1.3.x should upgrade to the latest released version,
1.3.4, in the usual fashion. This includes an update to the
legacy OpenSAML library, now at version 1.1.3.
Sites using 2.x should upgrade to the latest XMLTooling library,
version 1.2.2. No other components of the software are affected.
Sites using a Windows version of the 2.x software can obtain this
fix from the updated and signed postinstall.zip packages available
on the download site for the 2.2.1 SP. The installers have also been
updated, and you can easily check the xmltooling1_2.dll or log files
to determine which version you have.
Sites using non-Windows versions can update by building and installing
the updated xmltooling package from source, or by RPM, Macport, or
other applicable mechanism.
Thanks to Chris Ries and for reporting this issue.
URL for this Security Advisory:
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