Direct answer
A snapshot can contain sensitive data even when the original system is private. Review who can copy or restore it, its encryption-key permissions and the operational purpose of each sharing relationship.
Inventory snapshots and owners
List in-scope snapshots, account and region, source asset, classification, owner and retention period. Include manually created and automated backups. Use a synthetic test volume for active checks and avoid restoring production data into a test account.
Reference: AWS: Share an Amazon EBS snapshot.
Review sharing and key permissions
Compare permitted accounts or principals with approved recovery and migration requirements. Inspect the encryption key's policy and grants where applicable; sharing a snapshot and sharing its key are related but distinct decisions.
- Flag public or unknown cross-account sharing for owner review.
- Check expired migration exceptions.
- Separate metadata visibility from actual restore permission.
Test an authorized restore path
In an agreed isolated environment, attempt to restore a disposable encrypted snapshot using a permitted test identity and a separate unpermitted identity. Verify the expected access result without extracting sensitive contents; record the account and policy context.
Narrow and retest
Remove unintended sharing or key access through the approved change process, then repeat the permitted recovery and denied cases. Confirm backup and disaster recovery workflows still work and document any outstanding exception.
Assessment limits
Snapshot behavior and key sharing vary by service and provider. A successful test snapshot does not prove all backups or restoration paths are correctly restricted.
Frequently asked questions
Does encryption alone prevent another authorized account from restoring a snapshot?
No. Access to the snapshot and the decryption key must both be reviewed against the intended sharing policy.
Should a reviewer restore production data to prove a finding?
Prefer a synthetic test snapshot and least-privilege evidence. Real data access requires explicit scope and appropriate handling.
Primary sources and further reading
These guides combine published security guidance with practical assessment planning. Adapt checks to the owner's policy, environment, and authorized scope.
This guide was prepared with AI assistance using the linked sources and illustrative examples. Check current vendor guidance and your environment before making changes.