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Introduction:
Cloud certifications from AWS, Microsoft, Google, IBM, and Oracle validate essential skills for modern IT, DevOps, and cybersecurity roles. In 2026, all five major providers offer legitimate, no-cost training and badge-based certifications – a perfect entry point for professionals seeking to harden cloud environments, automate security controls, and audit infrastructure-as-code. This guide extracts each free certification link, provides step‑by‑step CLI tutorials for security testing, and maps common misconfigurations to mitigation commands.
Learning Objectives:
- Register for and complete five free cloud certification programs (AWS Cloud Practitioner, Azure AZ‑900, Google Cloud Skills Boost, IBM Cloud Badges, Oracle Cloud Foundations).
- Execute Linux/Windows commands to audit IAM roles, storage permissions, and API endpoints across multi‑cloud environments.
- Apply remediation scripts to fix critical misconfigurations like public S3 buckets, overly permissive Azure RBAC, and unauthenticated GCP APIs.
You Should Know:
- AWS Cloud Practitioner Essentials – Free Exam Voucher & Security CLI Lab
AWS offers a free digital badge for completing the Cloud Practitioner Essentials course (link: https://lnkd.in/gTQcQhMY). Beyond theory, you must understand how to detect and fix common security gaps.
Step‑by‑step: What this does and how to use it – After completing the AWS course, install the AWS CLI on Linux (or WSL on Windows) to audit real environments. Use the following commands to check for public S3 buckets and overly broad IAM policies:
Linux / macOS (AWS CLI v2):
Install AWS CLI
curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip"
unzip awscliv2.zip && sudo ./aws/install
Configure IAM user (use your training account credentials)
aws configure
List all S3 buckets and check ACL for public access
aws s3api list-buckets --query "Buckets[].Name" --output text | xargs -I {} aws s3api get-bucket-acl --bucket {} --query "Grants[?Grantee.URI=='http://acs.amazonaws.com/groups/global/AllUsers']"
Windows (PowerShell):
Install AWS Tools for PowerShell
Install-Module -1ame AWSPowerShell.NetCore -Force
Set credentials
Set-AWSCredential -AccessKey YOUR_KEY -SecretKey YOUR_SECRET
Find publicly readable buckets
Get-S3Bucket | ForEach-Object { Get-S3ACL -BucketName $<em>.BucketName | Where-Object {$</em>.Grants.Grantee.URI -eq "http://acs.amazonaws.com/groups/global/AllUsers"} }
Mitigation: If public buckets are found, block them with aws s3api put-public-access-block --bucket BUCKET_NAME --public-access-block-configuration BlockPublicAcls=true,IgnorePublicAcls=true.
- Azure AZ‑900 Cloud Fundamentals – Free Microsoft Learn Path & CLI Hardening
Microsoft’s AZ‑900 training (https://lnkd.in/gsb723ck) is completely free, including the virtual training day voucher. After passing, use the Azure CLI to detect risky RBAC assignments and open network security groups.
Step‑by‑step guide:
Linux / macOS / Windows (Azure CLI):
Install Azure CLI (cross‑platform)
curl -sL https://aka.ms/InstallAzureCLIDeb | sudo bash Ubuntu/Debian
Or on Windows: winget install -e --id Microsoft.AzureCLI
Login
az login
List all role assignments with Owner or Contributor privileges
az role assignment list --include-inherited --query "[?roleDefinitionName=='Owner' || roleDefinitionName=='Contributor'].{User:principalName, Role:roleDefinitionName}" --output table
Find network security groups allowing RDP (3389) or SSH (22) from internet (0.0.0.0/0)
az network nsg list --query "[].securityRules[?destinationPortRange=='3389' || destinationPortRange=='22']" --output table
Windows PowerShell alternative:
Use Azure PowerShell module
Connect-AzAccount
Get-AzRoleAssignment | Where-Object {$_.RoleDefinitionName -in 'Owner','Contributor'} | Select-Object DisplayName, RoleDefinitionName
Hardening: Remove overly permissive rules with az network nsg rule delete --1sg-1ame NSG_NAME --resource-group RG_NAME --1ame RULE_NAME.
- Google Cloud Skills Boost + Badges – Free Labs & IAM Policy Scanner
Google’s Skills Boost (https://lnkd.in/g6khN6J3) provides free quests and badges. Use `gcloud` CLI to audit API keys and storage ACLs.
Step‑by‑step guide:
Linux / Windows (gcloud CLI):
Install gcloud (Linux) echo "deb [signed-by=/usr/share/keyrings/cloud.google.gpg] https://packages.cloud.google.com/apt cloud-sdk main" | sudo tee -a /etc/apt/sources.list.d/google-cloud-sdk.list sudo apt update && sudo apt install google-cloud-sdk Authenticate gcloud auth login List all API keys and check for unrestricted access gcloud services api-keys list --format="table(displayName, restrictions)” Find storage buckets with uniform bucket-level access disabled (potential ACL misconfiguration) gsutil ls -p $(gcloud config get-value project) | while read bucket; do gsutil bucketpolicyonly get $bucket; done
Windows (PowerShell with gcloud): Same commands after installing from https://cloud.google.com/sdk/docs/install.
Exploitation awareness: Unrestricted API keys allow data exfiltration. Rotate keys with gcloud services api-keys delete KEY_ID.
- IBM Cloud Free Training & Badges – API Security & Vulnerability Scanning
IBM’s free badges (https://lnkd.in/gy29RuCR) include cloud security fundamentals. Use `ibmcloud` CLI and `curl` to test for exposed IAM endpoints.
Step‑by‑step guide:
Install IBM Cloud CLI (Linux/macOS) curl -fsSL https://clis.cloud.ibm.com/install/linux | sh Login ibmcloud login --sso List all API keys for a user (potential insider threat) ibmcloud iam api-keys --output json | jq '.[].name' Test for unauthenticated access to Cloud Object Storage (COS) using curl curl -I https://s3.us-south.cloud-object-storage.appdomain.cloud/YOUR_BUCKET_NAME/secret.txt If HTTP 200 OK without credentials → public exposure.
Mitigation: Enforce HMAC credentials and bucket policies via ibmcloud cos bucket-policy-put.
- Oracle Cloud Infrastructure (OCI) Foundations – Free Badge & Network ACL Hardening
Oracle’s free training (https://lnkd.in/gfa6dBbV) includes the OCI Foundations badge. Use OCI CLI to audit security lists and route tables.
Step‑by‑step guide:
Install OCI CLI (Linux/Windows) bash -c "$(curl -L https://raw.githubusercontent.com/oracle/oci-cli/master/scripts/install/install.sh)" Configure (use API keys from your free tier) oci setup config List security list rules that allow 0.0.0.0/0 ingress on sensitive ports oci network security-list list --query "data[].ingress_security_rules[?source=='0.0.0.0/0' && contains(tcp_options.destination_port_range,'22')]" --output table Find internet gateways attached to non‑DRG route tables oci network internet-gateway list --query "data[?is_enabled=='true']"
Windows alternative: Same commands after adding OCI CLI to PATH.
- Multi‑Cloud Vulnerability Exploitation & Mitigation – Hands‑on Script
Combine all prior checks into a unified bash script for daily cloud security scanning:
!/bin/bash
multi_cloud_audit.sh - Run from Linux with all CLIs installed
echo "=== AWS Public Buckets ==="
aws s3api list-buckets --query "Buckets[].Name" --output text | xargs -I {} aws s3api get-bucket-acl --bucket {} --query "Grants[?Grantee.URI=='http://acs.amazonaws.com/groups/global/AllUsers']" 2>/dev/null
echo "=== Azure Overly Permissive Roles ==="
az role assignment list --include-inherited --query "[?roleDefinitionName=='Owner' || roleDefinitionName=='Contributor'].[bash]" -o tsv
echo "=== GCP Unrestricted API Keys ==="
gcloud services api-keys list --filter="restrictions.api_targets=[]" --format="value(displayName)"
echo "=== Oracle Public Security Lists ==="
oci network security-list list --query "data[].ingress_security_rules[?source=='0.0.0.0/0']" --output table
What Undercode Say:
- Key Takeaway 1: Free cloud certifications are not just resume padding – they unlock hands‑on sandboxes where you can practice real security scanning using native CLIs. Each provider’s free tier lets you intentionally create and then remediate misconfigurations (public storage, open ports, excessive IAM) without financial risk.
- Key Takeaway 2: The most common cloud breaches (Capital One, Uber) stem from overly permissive API keys and public storage. The commands above directly detect those weaknesses. By combining free certifications with daily CLI audits, security analysts shift from theory to proactive hardening. Expect employer demand for “multi‑cloud CLI auditing” to spike in 2026 as more workloads become serverless.
Prediction:
- +1 Free certification paths will become the primary vetting tool for entry‑level cloud security roles by late 2026, replacing paid bootcamps as providers compete for talent.
- -1 The explosion of free badges will lead to “certification inflation” – HR filters may still require paid, proctored exams (e.g., AWS SAA) to differentiate serious candidates.
- +1 Community‑shared audit scripts (like the one above) will evolve into open‑source cloud security posture management (CSPM) tools, democratizing enterprise‑grade scanning for solo practitioners.
- -1 Attackers will automate scans for the exact misconfigurations listed in free certification curricula, increasing the need for continuous, automated remediation (not just one‑time fixes).
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