The DynamicMetadataProvider class in saml/saml2/metadata/impl/DynamicMetadataProvider.cpp in OpenSAML-C in OpenSAML before 2.6.1 fails to properly configure itself with the MetadataFilter plugins and does not perform critical security checks such as signature verification, enforcement of validity periods, and other checks specific to deployments, aka CPPOST-105.
www.securityfocus.com/bid/101898
bugs.debian.org/881856
git.shibboleth.net/view/?p=cpp-opensaml.git%3Ba=commit%3Bh=6182b0acf2df670e75423c2ed7afe6950ef11c9d
lists.debian.org/debian-lts-announce/2017/11/msg00024.html
shibboleth.net/community/advisories/secadv_20171115.txt
www.debian.org/security/2017/dsa-4039