# Cis Bind V100 2 2

> Give the BIND User Account an Invalid Shell (Automated)

- Skill: `cyberstrikeus/cis-bind-v100-2-2` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-bind-v100-2-2`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-bind-v100-2-2/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector CAUTION)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: cyberstrikeus (https://skillmd.com/u/cyberstrikeus)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cyberstrikeus/cis-bind-v100-2-2

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# 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:

```bash
# 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:

```bash
# 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