cyberstrikeus CIS 2.2 — Give the BIND User Account an Invalid Shell
Profile Applicability
- Authoritative Name Server Level 1
- Caching Only Name Server Level 1
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 specified.
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 /bin/false 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
/bin/false
References
None listed.
CIS Controls
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v6 | 16 Account Monitoring and Control | Y | Y | Y |
| v7 | 4.7 Limit Access to Script Tools | N | Y | Y |
MITRE ATT&CK Mappings
| Tactic | Technique |
|---|---|
| Persistence | T1136 Create Account |
| Privilege Escalation | T1078 Valid Accounts |
Profile
- Level 1 - Authoritative Name Server
- Level 1 - Caching Only Name Server