terraform.lang.security.s3-public-read-bucket.s3-public-read-bucket
semgrep
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S3 bucket with public read access detected.
Run Locally
Run in CI
Defintion
rules:
- id: s3-public-read-bucket
patterns:
- pattern-either:
- pattern: acl = "public-read"
- pattern: acl = "authenticated-read"
- pattern-not-inside: |
resource "aws_s3_bucket" "..." {
...
website { ... }
...
}
languages:
- hcl
severity: WARNING
message: S3 bucket with public read access detected.
metadata:
cwe:
- "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor"
references:
- https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/s3_bucket#acl
- https://docs.aws.amazon.com/AmazonS3/latest/dev/acl-overview.html#canned-acl
category: security
technology:
- terraform
- aws
owasp:
- A01:2021 - Broken Access Control
cwe2021-top25: true
subcategory:
- audit
likelihood: LOW
impact: LOW
confidence: LOW
license: Commons Clause License Condition v1.0[LGPL-2.1-only]
vulnerability_class:
- Mishandled Sensitive Information
Examples
s3-public-read-bucket.tf
resource "aws_s3_bucket" "a" {
bucket = "my-tf-test-bucket"
# ruleid: s3-public-read-bucket
acl = "public-read"
tags = {
Name = "My bucket"
Environment = "Dev"
}
}
resource "aws_s3_bucket" "b" {
bucket = "my-tf-test-bucket-b"
# ruleid: s3-public-read-bucket
acl = "authenticated-read"
tags = {
Name = "My bucket"
Environment = "Dev"
}
}
resource "aws_s3_bucket" "c" {
bucket = "s3-website-test.hashicorp.com"
# ok: s3-public-read-bucket
acl = "public-read"
policy = file("policy.json")
website {
index_document = "index.html"
error_document = "error.html"
routing_rules = <<EOF
[{
"Condition": {
"KeyPrefixEquals": "docs/"
},
"Redirect": {
"ReplaceKeyPrefixWith": "documents/"
}
}]
EOF
}
}
Short Link: https://sg.run/WgAy