# Cis Ubuntu2004 V300 1 2 2 1

> Ensure updates, patches, and additional security software are installed

- Skill: `cyberstrikeus/cis-ubuntu2004-v300-1-2-2-1` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-ubuntu2004-v300-1-2-2-1`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-ubuntu2004-v300-1-2-2-1/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Security
- Author: cyberstrikeus (https://skillmd.com/u/cyberstrikeus)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cyberstrikeus/cis-ubuntu2004-v300-1-2-2-1

---


# 1.2.2.1 Ensure updates, patches, and additional security software are installed (Manual)

## Profile

- Level 1 - Server
- Level 1 - Workstation

## Description

Periodically patches are released for included software either due to security flaws or to include additional functionality.

## Rationale

Newer patches may contain security enhancements that would not be available through the latest full update. As a result, it is recommended that the latest software patches be used to take advantage of the latest functionality. As with any software installation, organizations need to determine if a given update meets their requirements and verify the compatibility and supportability of any additional software against the update revision that is selected.

## Audit Procedure

### Command Line

Verify there are no updates or patches to install:

```bash
# apt update
# apt -s upgrade
```

## Expected Result

No pending updates or patches should be available for installation.

## Remediation

### Command Line

Run the following commands to update all packages following local site policy guidance on applying updates and patches:

Run the following command to update the system with the available patches and updates:

```bash
# apt update
```

Run one of the following commands to apply the updates and patches:

```bash
# apt upgrade
```

- OR -

```bash
# apt dist-upgrade
```

Note: When running the command `apt dist-upgrade` that apt has a "smart" conflict resolution system, and it will attempt to upgrade the most important packages at the expense of less important ones if necessary. So, `dist-upgrade` command may remove some packages.

## References

1. NIST SP 800-53 Rev. 5: SI-2

## Additional Information

Site policy may mandate a testing period before installation onto production systems for available updates.

- upgrade - is used to install the newest versions of all packages currently installed on the system from the sources enumerated in /etc/apt/sources.list. Packages currently installed with new versions available are retrieved and upgraded; under no circumstances are currently installed packages removed, or packages not already installed retrieved and installed. New versions of currently installed packages that cannot be upgraded without changing the install status of another package will be left at their current version. An update must be performed first so that apt knows that new versions of packages are available.
- dist-upgrade - in addition to performing the function of upgrade, also intelligently handles changing dependencies with new versions of packages; apt has a "smart" conflict resolution system, and it will attempt to upgrade the most important packages at the expense of less important ones if necessary. So, dist-upgrade command may remove some packages. The /etc/apt/sources.list file contains a list of locations from which to retrieve desired package files. See also apt_preferences(5) for a mechanism for overriding the general settings for individual packages.

## CIS Controls

| Controls Version | Control                                                      | IG 1 | IG 2 | IG 3 |
| ---------------- | ------------------------------------------------------------ | ---- | ---- | ---- |
| v8               | 7.3 Perform Automated Operating System Patch Management      | \*   | \*   | \*   |
| v8               | 7.4 Perform Automated Application Patch Management           | \*   | \*   | \*   |
| v7               | 3.4 Deploy Automated Operating System Patch Management Tools | \*   | \*   | \*   |
| v7               | 3.5 Deploy Automated Software Patch Management Tools         | \*   | \*   | \*   |

MITRE ATT&CK Mappings: T1195, T1195.001, T1195.002 | TA0001 | M1051