Impacted versions:
master: (since saas-14)
Steps to reproduce:

Current behavior:
No posibility to hide for some group a config parameter.
Expected behavior:
Secure this variables.
Video/Screenshot link (optional):
As of Odoo 11 ir.config.parameters (and many other similar internal tables) are only accessible by the system (administrators). This is a much better default, in order to harden the security.
When addons need to use a system parameter on behalf of a normal user, they can access it with a limited sudo() call. This ensures that all config parameters are safe by default. It was too common for security groups to be forgotten by mistake, exposing them easily via RPC to unprivileged users.
See also the introduction commit.
Most helpful comment
As of Odoo 11 ir.config.parameters (and many other similar internal tables) are only accessible by the system (administrators). This is a much better default, in order to harden the security.
When addons need to use a system parameter on behalf of a normal user, they can access it with a limited sudo() call. This ensures that all config parameters are safe by default. It was too common for security groups to be forgotten by mistake, exposing them easily via RPC to unprivileged users.
See also the introduction commit.