postgresql: Ability of database owners to install procedural languages via CREATE LANGUAGE found unsafe (DoS)

PostgreSQL 8.3.x before 8.3.19, 8.4.x before 8.4.12, 9.0.x before 9.0.8, and 9.1.x before 9.1.4 allows remote authenticated users to cause a denial of service server crash by adding the 1 SECURITY DEFINER or 2 SET attributes to a procedural language's call handler...