cis-bind-v100-2-2

name	cis-bind-v100-2-2
description	Give the BIND User Account an Invalid Shell (Automated)
category	cis-bind
version	1.0
author	cyberstrike-official
tags	["cis","bind","dns","isc-bind","bind9","permissions-ownership"]
cis_id	2.2
cis_benchmark	CIS ISC BIND DNS Server 9.11 Benchmark v1.0.0
tech_stack	["bind","isc-bind","dns","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

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