Advisory Weakness Curation

Phusion Passenger Denial of Service Phusion Passenger gem before 3.0.21 and 4.0.x before 4.0.5 for Ruby allows local users to cause a denial of service (prevent application start) or gain privileges by pre-creating a temporary "config" file in a directory with a predictable name in `/tmp/` before it is used by the gem.

Incorrect temporary file usage The passenger ruby gem, when used in standalone mode, does not use temporary files securely. If a local attacker were able to create a temporary directory that passenger uses and supply a custom nginx configuration file they could start a nginx instance with their own configuration file.