postgresql: privilege escalation via procedural language validator functions

The validator functions for the procedural languages PLs in PostgreSQL before 8.4.20, 9.0.x before 9.0.16, 9.1.x before 9.1.12, 9.2.x before 9.2.7, and 9.3.x before 9.3.3 allow remote authenticated users to gain privileges via a function that is 1 defined in another language or 2 not allowed to b...