securing-github-actions-workflows

name	securing-github-actions-workflows
description	Use when this skill covers hardening GitHub Actions workflows against supply chain attacks, credential theft, and privilege escalation. It addresses pinning actions to SHA digests, minimizing GITHUB_TOKEN permissions, protecting secrets from exfiltration, preventing script injection in workflow expressions, and implementing required reviewers for workflow changes.
domain	cybersecurity
tags	["devsecops","cicd","github-actions","supply-chain","workflow-security","secure-sdlc"]
subdomain	devsecops
version	1.0.0
author	oyi77
license	Apache-2.0
nist_csf	["PR.PS-01","GV.SC-07","ID.IM-04","PR.PS-04"]

Securing Github Actions Workflows

Overview

Cybersecurity skill for securing github actions workflows. Follows industry best practices and security standards.

When to Use

Trigger phrases:

• "securing github actions workflows"

• "This skill covers hardening GitHub Actions workflows against supply chain attack"

• When GitHub Actions is the CI/CD platform and workflows need hardening against supply chain attacks

• When workflows handle secrets, deploy to production, or have elevated permissions

• When preventing script injection via untrusted PR titles, branch names, or commit messages

• When requiring audit trails and approval gates for workflow modifications

• When third-party actions pose supply chain risk through mutable version tags

Do not use for securing other CI/CD platforms (see platform-specific hardening guides), for application vulnerability scanning (use SAST/DAST), or for secret detection in code (use Gitleaks).

When NOT to Use

• When you lack proper authorization for testing
• For production systems without change management
• When the task requires legal or compliance expertise beyond technical scope

Prerequisites

• GitHub repository with GitHub Actions enabled
• GitHub organization admin access for organization-level settings
• Understanding of GitHub Actions workflow syntax and events

Workflow

# Example: IOC detection
import re

IOC_PATTERNS = {
    "ip": r"\b(?:\d{1,3}\.){3}\d{1,3}\b",
    "domain": r"\b[a-z0-9-]+\.[a-z]{2,}\b",
    "hash_md5": r"\b[a-f0-9]{32}\b",
    "hash_sha256": r"\b[a-f0-9]{64}\b",
}

def extract_iocs(text: str) -> dict:
    return {k: re.findall(v, text) for k, v in IOC_PATTERNS.items()}