Candlepin before 0.7.24, as used in Red Hat Subscription Asset Manager before 1.2.1, does not properly check manifest signatures, which allows local users to modify manifests.
https://github.com/candlepin/candlepin/commit/f4d93230e58b969c506b4c9778e04482a059b08c
https://github.com/candlepin/candlepin/blob/master/candlepin.spec
https://bugzilla.redhat.com/show_bug.cgi?id=908613