How do I install the Cis GCP Cos 1.5.1.3 skill?

Run npx skillmds@latest add cyberstrikeus/cis-gcp-cos-1-5-1-3 in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Cis GCP Cos 1.5.1.3 skill do?

Ensure remote login warning banner is configured properly It is listed under DevOps & Infra on SkillMD.

Is Cis GCP Cos 1.5.1.3 safe to use?

SkillMD's automated safety review verdict for this skill is PASS. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Cis GCP Cos 1.5.1.3?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Cis GCP Cos 1.5.1.3 free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Cis GCP Cos 1.5.1.3?

cyberstrikeus (@cyberstrikeus) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Cis GCP Cos 1.5.1.3 by cyberstrikeus

Name: Cis GCP Cos 1.5.1.3
Author: cyberstrikeus

File contents

1.5.1.3 Ensure remote login warning banner is configured properly (Automated)

Description

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

Unix-based systems have typically displayed information about the OS release and patch level upon logging in to the system. This information can be useful to developers who are developing software for a particular OS platform. If mingetty(8) supports the following options, they display operating system information: \m - machine architecture \r - operating system release \s - operating system name \v - operating system version

Rationale

Warning messages inform users who are attempting to login to the system of their legal status regarding the system and must include the name of the organization that owns the system and any monitoring policies that are in place. Displaying OS and patch level information in login banners also has the side effect of providing detailed system information to attackers attempting to target specific exploits of a system. Authorized users can easily get this information by running the uname -a command once they have logged in.

Audit Procedure

Run the following command and verify that the contents match site policy:

# cat /etc/issue.net

Run the following command and verify no results are returned:

# grep -E -i "(\\v|\\r|\\m|\\s|$(grep '^ID=' /etc/os-release | cut -d= -f2 | sed -e 's/"//g'))" /etc/issue.net

Expected Result

The /etc/issue.net file should contain the appropriate site policy message. The grep command should return no results (no OS information leakage).

Remediation

Edit the /etc/issue.net file with the appropriate contents according to your site policy, remove any instances of \m, \r, \s, \v or references to the OS platform.

# echo "Authorized uses only. All activity may be monitored and reported." > /etc/issue.net

/etc is stateless on Container-Optimized OS. Therefore, the steps mentioned above needs to be performed after every boot.

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v7	5.1 Establish Secure Configurations	x	x	x

Profile

Level 1 - Server | Automated

---name: cis-gcp-cos-1-5-1-3description: Ensure remote login warning banner is configured properly---# 1.5.1.3 Ensure remote login warning banner is configured properly (Automated)## DescriptionThe contents of the `/etc/issue.net` file are displayed to users prior to login for remote connections from configured services.Unix-based systems have typically displayed information about the OS release and patch level upon logging in to the system. This information can be useful to developers who are developing software for a particular OS platform. If `mingetty(8)` supports the following options, they display operating system information: `\m` - machine architecture `\r` - operating system release `\s` - operating system name `\v` - operating system version## RationaleWarning messages inform users who are attempting to login to the system of their legal status regarding the system and must include the name of the organization that owns the system and any monitoring policies that are in place. Displaying OS and patch level information in login banners also has the side effect of providing detailed system information to attackers attempting to target specific exploits of a system. Authorized users can easily get this information by running the `uname -a` command once they have logged in.## Audit ProcedureRun the following command and verify that the contents match site policy:```bash# cat /etc/issue.net```Run the following command and verify no results are returned:```bash# grep -E -i "(\\v|\\r|\\m|\\s|$(grep '^ID=' /etc/os-release | cut -d= -f2 | sed -e 's/"//g'))" /etc/issue.net```## Expected ResultThe `/etc/issue.net` file should contain the appropriate site policy message. The grep command should return no results (no OS information leakage).## RemediationEdit the `/etc/issue.net` file with the appropriate contents according to your site policy, remove any instances of `\m`, `\r`, `\s`, `\v` or references to the `OS platform`.```bash# echo "Authorized uses only. All activity may be monitored and reported." > /etc/issue.net````/etc` is stateless on Container-Optimized OS. Therefore, the steps mentioned above needs to be performed after every boot.## CIS Controls| Controls Version | Control | IG 1 | IG 2 | IG 3 || ---------------- | ----------------------------------- | ---- | ---- | ---- || v7 | 5.1 Establish Secure Configurations | x | x | x |## ProfileLevel 1 - Server | Automated

Frequently asked questions

Cis GCP Cos 1.5.1.3