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this post was submitted on 01 Dec 2023
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They are not as secure, because there are less controls for ENV variables. Anybody in the same PID namespaces can cat /proc/PID/environ and read them. For files (say, config file) you can use mount namespaces and the regular file permissions to restrict access.
Of course you can mess up a secret implementation, but a chmod'd 600 file from another user requires some sort of arbitrary read vulnerability or privilege escalation (assuming another application on the same host is compromised, for example). If you get low-privileged access to the host, chances are you can dump the ENV for all processes.
Security-wise, ENV variables are worse compared to just a mounted config file, for example.