> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/appsec-rules/iac-security/storage/appsec-aws-93.md).

# S3 bucket policy allows lockout all but root user misconfiguration detected in code

## Rule Details

|                        |                           |
| ---------------------- | ------------------------- |
| Cortex AppSec Rule ID  | APPSEC\_AWS\_93           |
| Category - Subcategory | Storage - Permissions     |
| Provider               | AWS                       |
| Severity               | MEDIUM                    |
| Framework              | Terraform, Terraform Plan |

## Impact

This rule is designed to prevent configuration policies that could potentially lock out non-root users from accessing S3 buckets. This check is vital for maintaining access control in AWS environments and ensuring that bucket policies do not inadvertently create security risks by overly restrictive configurations.

## How to Fix

*Resource:* aws\_s3\_bucket, aws\_s3\_bucket\_policy

* *Argument:* policy

## Do not deny overly broad actions with a broad set of resources for all principals in an S3 policy. \[source,go]

resource "aws\_s3\_bucket" "example" { bucket = "example" }

resource "aws\_s3\_bucket\_policy" "example" { bucket = aws\_s3\_bucket.example.id

policy = <\<POLICY { "Version": "2012-10-17", "Statement": \[ { "Effect": "Deny",

* "Principal": "\*",
* "Principal": { "AWS":"some\_arn" }, "Action": "s3:\*",
* "Resource": \["arn:aws:s3:::example/\*", "arn:aws:s3:::example"] } ] } POLICY }

***


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