Atlas / Skills / cyberstrikeus / Cis Nginx V300 4 1 1

Cis Nginx V300 4 1 1CAUTION

skills/cyberstrikeus/cis-nginx-v300-4-1-1

Agent skill by cyberstrikeus · agents · ai hacking · ai penetration testing · Audited 2026-10-18

⚑ Report / re-scan Source ↗

Open-source AI-powered offensive security harness for automated penetration testing.

Verdict

CAUTION

Grade

Trust score

89 /100

Version

3.0

Hosts

—

License

AGPL-3.0

Stars

3,185

Overview

Open-source AI-powered offensive security harness for automated penetration testing.

Read from source at commit eaf7d03223fcOBSERVED · 2026-10-18

What it tells the agent

The instruction file, verbatim from the audited commit — this is the text the model reads, and the surface the audit's instruction layer examines. Quoted here so you can judge it without cloning anything.

---
name: cis-nginx-v300-4-1-1
description: "Ensure HTTP is redirected to HTTPS (Manual)"
category: cis-nginx
version: "3.0"
author: cyberstrike-official
tags: [cis, nginx, web-server, reverse-proxy, tls-ssl, encryption]
cis_id: "4.1.1"
cis_benchmark: "CIS NGINX Benchmark v3.0.0"
tech_stack: [nginx, linux, web-server]
cwe_ids: []
chains_with: []
prerequisites: []
severity_boost: {}
---

# CIS 4.1.1 — Ensure HTTP is redirected to HTTPS

## Profile Applicability

- Level 1 - Webserver
- Level 1 - Proxy
- Level 1 - Loadbalancer

## Description

Browsers and clients establish encrypted connections with servers by leveraging HTTPS. Requests leveraging HTTP are unencrypted. Unencrypted requests should be redirected so they are encrypted. Any listening HTTP port on your web server should redirect to a server profile that uses encryption. The default HTTP (unencrypted) port is `80`.

## Rationale

Redirecting user agent traffic to HTTPS helps to ensure all user traffic is encrypted. Modern browsers alert users that your website is insecure when HTTPS is not used. This can decrease user trust in your website and ultimately result in decreased use of your web services. Redirection from HTTP to HTTPS couples security with usability; users are able to access your website even if they lack the security awareness to use HTTPS over HTTP when requesting your website.

## Impact

Use of HTTPS does result in a performance reduction in traffic to your website, however, due to the increased value of the security, many businesses consider this to be a cost of doing business.

## Audit Procedure

To verify your server listening configuration, check your web server or proxy configuration file. The default web server configuration file is `/etc/nginx/conf.d/default.conf`, and the default proxy configuration file is `/etc/nginx/nginx.conf`. The configuration file should return a statement redirecting to HTTPS. This should be similar to the code below, where cisecurity.org is used as an example.

```nginx
server {
    listen 80;

    server_name cisecurity.org;

    return 301 https://$host$request_uri;
}
```

## Remediation

Edit your web server or proxy configuration file to redirect all unencrypted listening ports, such as port `80`, using a redirection through the return directive (cisecurity.org is used as an example server name).

```nginx
server {
    listen 80;

    server_name cisecurity.org;

    return 301 https://$host$request_uri;
}
```

## Default Value

NGINX is not configured to use HTTPS or redirect to it by default.

## References

1. https://nginx.org/en/docs/http/ngx_http_core_module.html

## CIS Controls

| Controls Version | Control                                           | IG 1 | IG 2 | IG 3 |
| ---------------- | ------------------------------------------------- | ---- | ---- | ---- |
| v8               | 3.10 Encrypt Sensitive Data in Transit            | N    | Y    | Y    |
| v7               | 14.4 Encrypt All Sensitive Information in Transit | N    | Y    | Y    |

## MITRE ATT&CK Mappings

| Tactic            | Technique                         |
| ----------------- | --------------------------------- |
| Credential Access | T1557 - Adversary-in-the-Middle   |
| Collection        | T1185 - Browser Session Hijacking |

## Profile

- Level 1 - Webserver
- Level 1 - Proxy
- Level 1 - Loadbalancer

Trust audit

CAUTIONgrade B · trust 89/100 Install with care. The audit found things worth knowing before you trust its output.

Layer	What it checks	Result
L0	Provenance & inventory	WARN
L1	Static analysis of the code	NA
L2	Instruction surface (what it tells the agent)	PASS
L3	Class-specific surface	PASS
L4	Behavioural (sandbox)	SKIPPED

What the source does

Filesystem: none-observed
Network: none-observed
Shell: none-observed
Dependencies: pinned
Secrets in source: none-found