Continuous Integration and Continuous Deployment (CI/CD) pipelines serve as the backbone of modern delivery software. Because pipelines possess wide write permissions to cloud infrastructure and databases, they have become prime targets for modern threat groups.
Common Attack Vectors in CI/CD
Attackers focus heavily on hijacking pipelines to inject malicious code (supply chain attacks) or to extract credentials stored within environment variables. Key vulnerability vectors include:
- Over-privileged Runner Identities: Runner nodes with unrestricted AWS/Azure admin tokens allow full control bypasses if a runner is exploited.
- Plain-text Secret Management: Hardcoded API tokens, database keys, or SSH certificates in repository files.
- Third-party Action Manipulation: Importing untrusted external dependency actions without pinning exact commit SHAs.
Hardening Checklist: Zero-Trust Configurations
1. Transition to OpenID Connect (OIDC)
Avoid storing persistent access keys on runners. Instead, configure platforms like AWS, GCP, or Azure to authenticate GitHub/GitLab runners dynamically using OIDC tokens, generating short-lived credentials that expire automatically after pipeline completion.
2. Commit Hash Pinning
When incorporating automated tooling from marketplace environments, reference dependencies by their specific commit cryptographic hash rather than mutable tags (e.g. action@v2 can be modified by an attacker, whereas a 40-character SHA hash cannot be altered).
3. Dynamic Secret Rotation
Integrate pipeline secrets with dedicated vaults (HashiCorp Vault, AWS Secrets Manager) rather than storing values inside configuration panels directly, verifying that secrets are systematically masked in runner output logs.
Conclusion
Securing the pipeline is as critical as securing the source code. Oeil Cyber works with organizations to map out DevSecOps pipelines, auditing identity scopes and implementing automatic container scanning checks to guarantee cloud infrastructure stays resilient against zero-day exploits.