Cloud Security Misconfigurations

Why Cloud Misconfigurations Are So Common

Cloud environments move fast. Development teams deploy infrastructure on-demand, often prioritizing speed over security. Default configurations in cloud platforms are frequently permissive — public-read storage buckets, unrestricted security groups, and overprivileged IAM roles are often the defaults or the path of least resistance. Unlike on-premises infrastructure where misconfigurations require physical network access to exploit, cloud misconfigurations are often directly accessible from the internet.

Most Dangerous AWS Misconfigurations

• Public S3 buckets — S3 buckets configured for public access expose whatever data they contain to the entire internet. Sensitive data in public buckets is discovered routinely by both security researchers and attackers.
• Overprivileged IAM roles — IAM roles and users with AdministratorAccess or broad wildcard permissions violate least privilege and create catastrophic exposure if the credentials are compromised.
• Exposed access keys — AWS access keys committed to code repositories are discovered within minutes by automated scanners. This is a well-documented attack vector with documented six-figure cost incidents.
• Unrestricted security groups — Security groups that allow all inbound traffic (0.0.0.0/0) on management ports expose EC2 instances to the entire internet.
• CloudTrail disabled — Without CloudTrail logging, attackers can operate in your AWS environment without leaving a trail for incident response.

Most Dangerous Azure and M365 Misconfigurations

• Legacy authentication enabled — Legacy authentication protocols (SMTP AUTH, IMAP, POP3) bypass modern MFA policies and are a primary vector for credential-based attacks against M365.
• Conditional access gaps — Conditional access policies that do not cover all users, all applications, or all locations create bypass paths.
• Excessive global administrator accounts — Multiple global administrator accounts increase the attack surface. Microsoft recommends a maximum of five, with just-in-time elevation for day-to-day tasks.
• Mailbox audit logging disabled — Without mailbox audit logging, detecting email compromise or data theft is significantly more difficult.
• External sharing unrestricted — SharePoint and OneDrive external sharing configured without restrictions can expose sensitive documents to anyone with a link.

How Penetration Testing Addresses Cloud Misconfigurations

External and web application penetration tests increasingly scope cloud infrastructure alongside traditional on-premises systems. Grid32 engineers assess cloud configurations for common misconfigurations as part of engagements where cloud infrastructure is in scope.