Cloud Security: The Most Common Misconfigurations in AWS, Azure, and GCP
Most cloud security incidents do not stem from provider failures but from configuration mistakes made by those who manage the environment. See the most common ones and how to avoid them.
❓What are the most common misconfigurations in cloud environments?
The most common are storage buckets with unintended public access, overly broad IAM permissions, API keys exposed in source code, security groups open to the internet, and a lack of encryption on sensitive data. Most of them do not involve provider failures; they are human configuration errors.
Migrating to the cloud has brought agility, scalability, and lower operating costs to thousands of companies.
But it has also brought a new kind of risk: most security incidents in cloud environments do not stem from provider failures (AWS, Azure, and GCP invest heavily in infrastructure security) but from configuration mistakes made by those who manage the environment.
A storage bucket left public, an IAM permission granted "just for testing" and never revoked, an API key accidentally committed to the repository: these are simple details that, in practice, have already caused some of the most significant data leaks of recent years.
Cloud providers protect the physical infrastructure and underlying services. The secure configuration of everything that runs on top of it (IAM, storage, networking, data) is the customer's responsibility.
1. Buckets and Storage With Unintended Public Access
Historically, this is one of the most common and most exploited mistakes.
S3 buckets (AWS), Blob Storage (Azure), and Cloud Storage (GCP) are frequently configured with public read permissions during testing or development, and that configuration is never reverted before going to production.
The result: customer data, database backups, credentials, and internal documents become accessible to anyone who discovers the resource's address, without any authentication.
2. Overly Broad IAM Permissions
It is common to find users, applications, and services with permissions far beyond what they actually need, often with full administrative access when access to a single specific service would suffice.
The problem is not merely theoretical: if a credential with those broad permissions is compromised (through phishing, a leak in a code repository, or another vector), the attacker inherits that entire level of access.
The principle of least privilege, granting only what is necessary and nothing more, is one of the most effective defenses and, at the same time, one of the most frequently ignored.
3. API Keys and Credentials Exposed in Code
Access keys, API tokens, and database credentials frequently end up committed to code repositories, sometimes public, sometimes private, but still accessible to more people than they should be.
Automated tools constantly scan public repositories on GitHub and other platforms looking for exactly this kind of exposure. The time between a credential being exposed and being exploited can be a matter of minutes.
4. Open Security Groups and Firewall Rules
Administrative ports (SSH, RDP, database management panels) open to 0.0.0.0/0, meaning the entire internet, are still frequently found during security assessments.
This configuration, usually set up "temporarily" during a deploy or test, turns any vulnerability in those services into a direct entry point into the environment.
5. Lack of Encryption on Sensitive Data
Many cloud storage and database services offer encryption at rest with just a few clicks, but that option is frequently left disabled, either out of unawareness or because it was not part of the default configuration used when the resource was created.
In the event of unauthorized access, data without proper encryption is directly exposed, with no additional layer of protection.
6. Insufficient Logging and Monitoring
Without centralized logs and configured alerts, suspicious activity in a cloud environment can go completely unnoticed for weeks or months.
Services such as AWS CloudTrail, Azure Monitor, and GCP Cloud Audit Logs exist precisely for this, but they are frequently not configured with the granularity and alerts needed for effective detection.
How to Reduce the Risks
- Adopt the principle of least privilege in all IAM policies
- Enable encryption at rest and in transit by default
- Never commit credentials to code; use secrets managers (Secrets Manager, Key Vault, Secret Manager)
- Periodically review public permissions on buckets and storage
- Restrict administrative access by IP or VPN, never open to the internet
- Centralize logs and configure alerts for anomalous activity
- Perform security assessments specific to the cloud environment in use
Conclusion
The cloud infrastructure of the major providers is robust. In practice, the weak point is almost always the configuration built on top of it.
Cloud environments grow quickly, with different teams creating resources independently, and it is precisely in that uncontrolled growth that misconfigurations pile up without anyone noticing.
A security assessment specific to the cloud environment, performed periodically, identifies these problems before an attacker finds them first.
Has Your Cloud Environment Been Assessed Yet?
LoPrestiSec performs security assessments of AWS, Azure, and GCP environments, identifying misconfigurations, excessive permissions, and exposures before they become incidents.
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