Exposure of Sensitive Information to an Unauthorized Actor

Summary

pgjdbc is an open source postgresql JDBC Driver. In affected versions 9.4.x, 42.x prior to 42.2.27, 42.3.x prior to 42.3.8, 42.4.x prior to 42.4.3 and 42.5.x prior to 42.5.1 has a prepared statement using either `PreparedStatement.setText(int, InputStream)` or `PreparedStatemet.setBytea(int, InputStream)` will create a temporary file if the InputStream is larger than 2k. This will create a temporary file which is readable by other users on Unix like systems, but not MacOS. On Unix like systems, the system's temporary directory is shared between all users on that system. Because of this, when files and directories are written into this directory they are, by default, readable by other users on that same system. This vulnerability does not allow other users to overwrite the contents of these directories or files. This is purely an information disclosure vulnerability.