# Cis Ubuntu2004 V300 1 6 6

> Ensure access to /etc/issue.net is configured

- Skill: `cyberstrikeus/cis-ubuntu2004-v300-1-6-6` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu2004-v300-1-6-6`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu2004-v300-1-6-6/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- 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-ubuntu2004-v300-1-6-6

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# 1.6.6 Ensure access to /etc/issue.net is configured (Automated)

## Profile

- Level 1 - Server
- Level 1 - Workstation

## Description

The contents of the `/etc/issue.net` file are displayed to users prior to login for remote connections from configured services.

## Rationale

- IF - the `/etc/issue.net` file does not have the correct access configured, it could be modified by unauthorized users with incorrect or misleading information.

## Audit Procedure

### Command Line

Run the following command and verify `Access` is `644` or more restrictive and `Uid` and `Gid` are both `0/root`:

```bash
# stat -Lc 'Access: (%#a/%A) Uid: ( %u/ %U) Gid: ( %g/ %G)' /etc/issue.net
```

```
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
```

## Expected Result

Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)

## Remediation

### Command Line

Run the following commands to set mode, owner, and group on `/etc/issue.net`:

```bash
# chown root:root $(readlink -e /etc/issue.net)
# chmod u-x,go-wx $(readlink -e /etc/issue.net)
```

## Default Value

Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)

## References

1. NIST SP 800-53 Rev. 5: AC-3, MP-2

## CIS Controls

| Controls Version | Control                                               | IG 1 | IG 2 | IG 3 |
| ---------------- | ----------------------------------------------------- | ---- | ---- | ---- |
| v8               | 3.3 Configure Data Access Control Lists               | \*   | \*   | \*   |
| v7               | 14.6 Protect Information through Access Control Lists | \*   | \*   | \*   |

MITRE ATT&CK Mappings: T1222, T1222.002 | TA0005 | M1022