The FreeRADIUS server relies on OpenSSL to perform certificate validation, including Certificate Revocation List (CRL) checks. The FreeRADIUS usage of OpenSSL, in CRL application, limits the checks to leaf certificates, therefore not detecting revocation of intermediate CA certificates. An unexpired client certificate, issued by an intermediate CA with a revoked certificate, is therefore accepted by FreeRADIUS. Specifically sets the X509_V_FLAG_CRL_CHECK flag for leaf certificate CRL checks, but does not use X509_V_FLAG_CRL_CHECK_ALL for CRL checks on the complete trust chain. The FreeRADIUS project advises that the recommended configuration is to use self-signed CAs for all EAP-TLS methods. Upstream fixes: - 2.x.x: https://github.com/FreeRADIUS/freeradius-server/commit/5e698b407dcac2bc45cf03484bac4398109d25c3 - 3.0.x: https://github.com/FreeRADIUS/freeradius-server/commit/874b39451702338389260edbfc52b381b20352ec External References: http://freeradius.org/security.html http://www.ocert.org/advisories/ocert-2015-008.html
Created freeradius tracking bugs for this issue: Affects: fedora-all [bug 1234976]