REDHAT-BUG-892813

First published: Mon Jan 07 2013(Updated: )

Michael Scherer reported that the passenger ruby gem, when used in standalone mode, does not use temporary files in a secure manner. In the lib/phusion_passenger/standalone/main.rb's create_nginx_controller function, passenger creates an nginx configuration file insecurely and starts nginx with that configuration file: @temp_dir = "/tmp/passenger-standalone.#{$$}" @config_filename = "#{@temp_dir}/config" If a local attacker were able to create a temporary directory that passenger uses and supply a custom nginx configuration file they could start an nginx instance with their own configuration file. This could result in a denial of service condition for a legitimate service or, if passenger were executed as root (in order to have nginx listen on port 80, for instance), this could lead to a local root compromise.

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