cyberstrikeus CIS 2.2 — Give the BIND User Account an Invalid Shell
Profile Applicability
- Level 1 - Authoritative Name Server
- Level 1 - Caching Only Name Server
Description
The BIND user account, named by default, must not be used as a regular login account, and should be assigned an invalid or nologin shell to ensure that the account cannot be used to login.
Rationale
Service accounts such as the named account represent a risk if they can be used to get a login shell to the system.
Impact
Not Applicable
Audit Procedure
Check the named login shell in the /etc/passwd file:
# grep named /etc/passwd
named:x:25:25:Named:/var/named:/sbin/nologin
The named account shell must be /sbin/nologin or /dev/null similar to the entry shown.
Remediation
Change the named account to use the nologin shell as shown:
# chsh -s /sbin/nologin named
Default Value
/sbin/nologin
References
Not Applicable
CIS Controls
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v6 | 16 - Account Monitoring and Control | N | Y | Y |
MITRE ATT&CK Mappings
| Tactic | Technique |
|---|---|
| Privilege Escalation | T1078 - Valid Accounts |
| Persistence | T1136 - Create Account |
Profile
- Level 1 - Authoritative Name Server
- Level 1 - Caching Only Name Server