In agent/Core/SpawningKit/Spawner.h in Phusion Passenger 5.1.10 (fixed in Passenger Open Source 5.1.11 and Passenger Enterprise 5.1.10), if Passenger is running as root, it is possible to list the contents of arbitrary files on a system by symlinking a file named REVISION from the application root folder to a file of choice and querying passenger-status --show=xml.
{ "nvd_published_at": "2017-12-14T22:29:00Z", "cwe_ids": [ "CWE-200" ], "severity": "MODERATE", "github_reviewed": true, "github_reviewed_at": "2022-06-17T21:25:35Z" }