Bug 870234 (CVE-2012-4546)

It was found that the current default configuration of IPA servers did not publish correct CRLs (Certificate Revocation Lists).  The default configuration specifies that every replica is to generate its own CRL, however this can result in inconsistencies in the CRL contents provided to clients from different Identity Management replicas.  More specifically, if a certificate is revoked on one Identity Management replica, it will not show up on another Identity Management replica.

To avoid this inconsistency, the solution is to configure CRL generation to only take place on one Identity Management server.  To do so in Red Hat Enterprise Linux 6.3 and earlier, the CRL configuration must be changed on all Identity Management servers.

Please refer to the kbase https://access.redhat.com/knowledge/solutions/295843 for further details on how to properly implement the work-around.  As of Red Hat Enterprise Linux 6.4, Identity Management replicas will not have CRL generation enabled by default (except for the first server which will be enabled), so it will not need to be disabled manually, however if upgrading from 6.3 to 6.4, users must follow the instructions in the kbase article to resolve this manually as the upgrade will not resolve the issue.

If the first server is decommissioned (the CRL generator), then CRL generation must be moved to another server, following provided product documentation.