GHSA-whfx-877c-5p28 Insecure Permissions in Phusion Passenger

• RubyGems passenger: >= 5.3.0, < 5.3.2 → fixed in 5.3.2

An Insecure Permissions vulnerability in SpawningKit in Phusion Passenger 5.3.x before 5.3.2 causes information disclosure in the following situation: given a Passenger-spawned application process that reports that it listens on a certain Unix domain socket, if any of the parent directories of said socket are writable by a normal user that is not the application's user, then that non-application user can swap that directory with something else, resulting in traffic being redirected to a non-application user's process through an alternative Unix domain socket.