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2.1.27 Ensure the operating system is configured to mask the debug-shell systemd service

Information

The debug-shell systemd service must be disabled.

The debug-shell requires no authentication and provides root privileges to anyone who has physical access to the machine. While this feature is disabled by default, masking it adds an additional layer of assurance that it will not be enabled via a dependency in systemd. This also prevents attackers with physical access from trivially bypassing security on the machine through valid troubleshooting configurations and gaining root access when the system is rebooted.

Solution

Configure the system to mask the debug-shell systemd service with the following command:

# systemctl mask debug-shell.service

Created symlink /etc/systemd/system/debug-shell.service -> /dev/null

Reload the daemon to take effect.

# systemctl daemon-reload

See Also

https://workbench.cisecurity.org/benchmarks/19886

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6, 800-53|CM-6b., 800-53|CM-7, CAT|II, CSCv7|9.2, Rule-ID|SV-230532r627750_rule, STIG-ID|RHEL-08-040180, Vuln-ID|V-230532

Plugin: Unix

Control ID: aa5c36b00691cc8cdb1bf7d6e3e144204b75d5562aa195aaa63f9a8ce5b2db7b