Lynis Security Controls
BOOT-5260 - Single user mode for systemd
Systemd has a single user mode, named rescue.service. Similar to normal single user mode, it allows access to the system and bypass several levels of authorization. To protect against this, reconfigure the service with the sulogin option.
How to solve
Change your rescue.service file (/usr/lib/systemd/system/rescue.service) and define sulogin. ExecStart=-/usr/sbin/sulogin Note: ensure that it is linking to the right sulogin binary, which can change between distributions.
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Linux and Unix System Hardening
This information is provided as part of the Lynis community project. It is related to Lynis control BOOT-5260. All information should be considered as-is, without guarantees. Any advice or snippets should be tested before implementing in production environments.
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