RDS instance snapshots should not be publicly shared

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Description

Secure your Amazon Relational Database Service (RDS) database snapshots by ensuring they are not publicly accessible.

Rationale

RDS Snapshots can be marked as public, allowing anyone the ability to copy the snapshot to their AWS account and create database instances from it. Unless a snapshot is being shared intentionally, it should be deleted.

Remediation

From the console

Follow the Stop sharing a manual DB snapshot with an AWS account AWS Console docs.

From the command line

Run modify-db-snapshot-attribute with the snapshot identifier, attribute name, and values to remove. This removes permission from a particular AWS account to restore the DB snapshot.

aws rds modify-db-snapshot-attribute \
    --db-snapshot-identifier yourdbsnapshot \
    --attribute-name restore \
    --values-to-remove "all"
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