RADOS Gateway in Ceph 12.1.0 through 12.2.1 allows remote authenticated users to cause a denial of service (assertion failure and application exit) by leveraging \full\ (not necessarily admin) privileges to post an invalid profile to the admin API related to rgw/rgw_iam_policy.cc rgw/rgw_basic_types.h and rgw/rgw_iam_types.h.