# Cis Bind V100 2 3

> Cis Bind V100 2 3 is an Agent Skill for devops & security published in the CyberStrikeus/CyberStrike repository on GitHub: a SKILL.md instruction file an AI agent can load to do this task.

Lock the BIND User Account (Automated)

- Skill name: `cis-bind-v100-2-3`
- Category: [DevOps & Security](https://www.openparable.com/skill/devops-security/1)
- Source: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/CIS_benchmarks/Server_Software/Bind/CIS_ISC_BIND_DNS_Server_9.11_Benchmark_v1.0.0/cis-bind-v100-2-3/SKILL.md
- Repository: CyberStrikeus/CyberStrike (1,211 GitHub stars when collected)

## SKILL.md

# CIS 2.3 — Lock the BIND User Account

## Profile Applicability

- Authoritative Name Server Level 1
- Caching Only Name Server Level 1

## Description

The user account under which BIND runs should not have a valid password, but should be locked.

## Rationale

As a defense-in-depth measure the named user account should be locked to prevent logins, and to prevent a user from `su`'ing to `named` using a password. In general, there shouldn't be a need for anyone to have to `su` as `named`, and when there is a need, then `sudo` should be used instead, which would not require the account password.

## Impact

Not specified.

## Audit Procedure

Ensure the named account is locked using the following:

```bash
# passwd -S named
named LK 2020-02-11 -1 -1 -1 -1 (Password locked.)
```

The results must have the LK value in the second field, similar to the output shown above.

## Remediation

To remediate, lock the named account using the password command with the lock option as shown below.

```bash
# passwd -l named
Locking password for user named.
passwd: Success
```

## Default Value

Account is locked by default.

## References

None listed.

## CIS Controls

| Controls Version | Control                           | IG 1 | IG 2 | IG 3 |
| ---------------- | --------------------------------- | ---- | ---- | ---- |
| v6               | 16 Account Monitoring and Control | Y    | Y    | Y    |

## MITRE ATT&CK Mappings

| Tactic               | Technique            |
| -------------------- | -------------------- |
| Privilege Escalation | T1078 Valid Accounts |
| Credential Access    | T1110 Brute Force    |

## Profile

- Level 1 - Authoritative Name Server
- Level 1 - Caching Only Name Server

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Source: https://www.openparable.com/skill/devops-security/cis-bind-v100-2-3 (OpenParable). Cite the canonical URL above.