Prowler — Install, Use, Optimise (2026)

Multi-cloud security assessment — CIS, NIST, ISO 27001, SOC 2, ENS controls baked in. AWS-first, expanding to Azure/GCP/Kubernetes.

Installation

Pick the install method that matches your stack. The Docker option is the cleanest for one-off scans where you don’t want to pollute your workstation.

pipx (recommended)

pipx install prowler

Docker

docker run -ti --rm -v ~/.aws:/root/.aws/:ro toniblyx/prowler:latest aws

Source

git clone https://github.com/prowler-cloud/prowler && cd prowler && pip install .

Core commands

The handful of invocations you’ll actually run on 90% of engagements:

AWS audit (default CIS)

prowler aws

Specific compliance framework

prowler aws --compliance soc2_aws

Single check

prowler aws --check ec2_securitygroup_allow_ingress_from_internet_to_any_port

Specific region only

prowler aws --region ap-south-1 ap-south-2

Send findings to Slack

prowler aws --slack

Output formats

prowler aws --output-formats json-asff csv html

Performance optimisation

What separates a junior who runs the default invocation from a practitioner who knows the knobs:

• --checks-folder to specify only your custom rules — skips 250+ default checks if only specific ones matter.
• --parallel-jobs 50 default; bump to 100 on large accounts (will hit rate limits eventually).
• --no-banner --quiet for CI-friendly output.
• AWS Security Hub integration: --output-formats json-asff + --security-hub ingests findings automatically.
• CIS-only audit: ~5-10 min for typical account. Full check set: 15-45 min.

Common pitfalls

Real failure modes that bite people on engagements. Most are recoverable; a few are reputation-damaging.

• Default IAM policy is broad. Use the minimum-perm policy from docs — especially in production.
• Some checks fail silently if API permission is missing. Run with --log-level WARNING to spot.
• Output JSON-ASFF format follows AWS Security Hub schema — useful for SH integration but verbose for human reading.
• --ignore-exit-code-3 to prevent CI failing on findings.

Modern alternatives in 2026

The ecosystem moves fast. These are tools you should at least be aware of:

• ScoutSuite — multi-cloud, better HTML report, fewer compliance frameworks.
• CloudCustodian — Python-first cloud posture-as-code.
• AWS Security Hub — native, integrated.

India context and engagement notes

Prowler is the de-facto AWS audit tool for SOC 2 / ISO 27001 prep. For Indian SEBI CSCRF audits, customize the cscrf_aws compliance group (community-contributed). Run weekly via GitHub Actions; PRs that change cloud infra trigger Prowler against staging.

⚖️ Legal: Use only on systems you own or have explicit written authorisation to test. In India, unauthorised access is punishable under Section 66 of the IT Act, 2000 (up to 3 years imprisonment + fine). Pair every engagement with a signed Statement of Work or Rules of Engagement before running anything from this page.