The URL connection string loggerFile property could be mis-used to create an arbitrary file on the system that the driver is loaded. Additionally anything in the connection string will be logged and subsequently written into that file. In an insecure system it would be possible to execute this file through a webserver.
While we do not consider this a security issue with the driver, we have decided to remove the loggerFile and loggerLevel connection properties in the next release of the driver. Removal of those properties does not make exposing the JDBC URL or connection properties to an attacker safe and we continue to suggest that applications do not allow untrusted users to specify arbitrary connection properties. We are removing them to prevent misuse and their functionality can be delegated to java.util.logging.
The changelog is not very useful as the change was done behind a security advisory. The short version is that loggerFile and loggerLevel properties still exist but do not do anything.
The PostgreSQL JDBC team would like to thank all that have participated in this release!
