Issues were found in the handling of XML encryption in simpleSAMLphp, an application for federated authentication. The following two issues have been addressed:

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Debian Security Advisory DSA-2330-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
http://www.debian.org/security/                           Thijs Kinkhorst
October 27, 2011                       http://www.debian.org/security/faq
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Package        : simplesamlphp
Vulnerability  : xml encryption weakness
Problem type   : remote
Debian-specific: no

Issues were found in the handling of XML encryption in simpleSAMLphp,
an application for federated authentication. The following two issues
have been addressed:

It may be possible to use an SP as an oracle to decrypt encrypted
messages sent to that SP.

It may be possible to use the SP as a key oracle which can be used
to forge messages from that SP by issuing 300000-2000000 queries to
the SP. 

The oldstable distribution (lenny) does not contain simplesamlphp.

For the stable distribution (squeeze), this problem has been fixed in
version 1.6.3-2.

The testing distribution (wheezy) will be fixed soon.

For the unstable distribution (sid), this problem has been fixed in
version 1.8.2-1.

We recommend that you upgrade your simplesamlphp packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/

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