Container-Optimized OS
TMA-COS-5.5
Ensure access to the su command is restricted
Description
The su command allows a user to run a command or shell as another user. The program has been superseded by sudo , which allows for more granular control over privileged access. Normally, the su command can be executed by any user. By uncommenting the pam_wheel.so statement in /etc/pam.d/su , the su command will only allow users in the wheel group to execute su . Restricting the use of su , and using sudo in its place, provides system administrators better control of the escalation of user privileges to execute privileged commands. The sudo utility also provides a better logging and audit mechanism, as it can log each command executed via sudo , whereas su can only record that a user executed the su program.
Méthode de vérification
Méthode d'audit: Revue manuelle
Run the following command and verify output includes matching line: # grep pam_wheel.so /etc/pam.d/su auth required pam_wheel.so use_uid Run the following command and verify users in wheel group match site policy: # grep wheel /etc/group wheel:!:10:root,<user list>
Méthode de correction
Méthode de correction: Recommandation ou correctif d'infrastructure
Add the following line to the /etc/pam.d/su file: auth required pam_wheel.so use_uid Create a comma separated list of users in the wheel statement in the /etc/group file: wheel:!:10:root,<user list> /etc is stateless on Container-Optimized OS. Therefore, /etc cannot be used to make these changes persistent across reboots. The steps mentioned above needs to be performed after every boot.
Propriétés
- Systèmes d'exploitation
- Tous
- Étiquettes
- access-controlcontainer-optimized-oscos
- Référence
- CIS Google Container-Optimized OS Benchmark v1.2.0 - 5.5 Ensure access to the su command is restricted