CVE-2017-18122

A signature-validation bypass issue was discovered in SimpleSAMLphp through
1.14.16. A SimpleSAMLphp Service Provider using SAML 1.1 will regard as
valid any unsigned SAML response containing more than one signed assertion,
provided that the signature of at least one of the assertions is valid.
Attributes contained in all the assertions received will be merged and the
entityID of the first assertion received will be used, allowing an attacker
to impersonate any user of any IdP given an assertion signed by the
targeted IdP.

Bugs

• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=889286&gt;