cis-bind9-v301-2-2

DevOps & Security

Give the BIND User Account an Invalid Shell (Automated)

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Source SKILL.md: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/CIS_benchmarks/Server_Software/Bind/CIS_ISC_BIND_DNS_Server_9.9_Benchmark_v3.0.1/cis-bind9-v301-2-2/SKILL.md

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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