Amazon Elastic Block Store is a block storage service for cloud virtual machines. It provides attachable, persistent volumes that a server can format with a file system or use as raw block devices, with snapshots used for backup, cloning and recovery.
What Amazon Elastic Block Store is used for
Amazon Elastic Block Store, or EBS, is the persistent storage layer that gives a cloud virtual machine durable block volumes separate from the instance lifecycle. That makes it suitable for operating systems, application data, databases, and any workload that needs low-latency storage that can be detached, reattached, or snapshotted independently of the server.
Because the volume is attachable and persistent, EBS changes the security conversation from “what is on the server” to “who can create, attach, snapshot, copy, and delete storage.” Those actions can expose sensitive data just as quickly as a compromised host can.
How EBS volumes and snapshots work
An EBS volume behaves like a raw block device until the operating system formats and mounts it. That means file-system controls, encryption settings, and access permissions are applied by the workload after attachment, while the cloud platform controls the volume object itself.
Snapshots add an additional layer of durability and operational flexibility. They support backup, cloning, and disaster recovery, but they also create stored copies of data that may outlive the original instance, so snapshot governance is part of storage security rather than a separate backup concern.
In practice, the security boundary is split between the cloud control plane and the guest operating system. The control plane determines whether a volume or snapshot can be attached, copied, shared, or restored, while the instance determines how the mounted data is protected once it is in use.
Security implications of persistent cloud block storage
EBS can store highly sensitive data, including credentials, application state, database files, and cryptographic material if a workload is poorly designed. If those volumes or snapshots are exposed to the wrong account or copied without proper governance, the attacker does not need the original server to recover the data.
Encryption helps, but it is only one part of the picture. A protected volume can still be at risk if an attacker gains permissions to create a snapshot, restore a copy into another environment, or attach the volume to a different compute instance for offline access.
The relevant security model is therefore not just storage confidentiality, but also attachment control, snapshot sharing, retention, and lifecycle management. Those are the points where misuse usually becomes operationally visible.
Operational use cases and recovery trade-offs
EBS is often chosen when teams need predictable storage performance and fast recovery from snapshots. That makes it useful for stateful services, but the same durability that improves resilience can also preserve bad states, stale secrets, or malware-infected files if recovery processes are not disciplined.
For example, restoring a volume from a snapshot may also restore compromised application data or an outdated configuration that reintroduces the original problem. Recovery planning therefore has to include data validation, not just volume restoration.
Elastic block storage is also a shared responsibility topic. The cloud provider supplies the storage service, but the organisation owns the data classification, encryption posture, snapshot access, and the decision about what should be stored on attached volumes in the first place.
Risk and Threat Considerations
EBS creates material risk when storage objects outlive the compute instance, because that persistence can preserve sensitive data, recovery copies, and stale access paths. Snapshot sprawl, over-broad attachment permissions, and accidental sharing are common mechanisms that turn a storage convenience into exposure.
Failure mechanism: An attacker or careless operator uses control-plane access to copy, attach, or restore a volume or snapshot, then reads data outside the intended host boundary. If the workload stores secrets or plaintext data on disk, the compromise can become silent and durable.
Impact: Data exposure can include application records, credentials, configuration files, and backup copies, and remediation may require revoking access, deleting or re-encrypting stored copies, and validating that restored systems are clean.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 addresses the attack and risk surface, while NIST SP 800-53 Rev 5 and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | SC-28 — Protection of Information at Rest | EBS volumes and snapshots store data at rest that needs confidentiality protection. |
| AC-6 — Least Privilege | EBS attachment, snapshot copy, and share actions depend on tightly scoped access. | |
| CP-9 — System Backup | EBS snapshots are a core backup and recovery mechanism for persistent workloads. | |
| Recommendation — Encrypt EBS volumes and snapshots to protect data at rest. Restrict who can create, attach, copy, and share EBS resources. Use snapshots as controlled backups and validate recovery from them. | ||
| NIST CSF 2.0 | PR.AA-05 — Protective Technology and Access Management | EBS governance depends on controlling access to storage objects and recovery paths. |
| Recommendation — Apply access controls to limit who can manipulate EBS volumes and snapshots. | ||
| OWASP Non-Human Identity Top 10 | NHI-05 — Overprivileged NHI | Cloud storage automation and service access can over-privilege volume and snapshot operations. |
| Recommendation — Limit non-human access that can manage EBS volumes and snapshots. | ||
Practitioner Guidance
Why practitioners should care: EBS is not just a storage choice, it is an access-control surface with data-retention consequences. Treat volume creation, attachment, snapshotting, and sharing as governed actions, especially where workloads handle regulated or high-value data.
What to watch for: Focus review on volumes and snapshots that are long-lived, copied across accounts, or detached from the instances that created them. Those are the places where forgotten data and unintended exposure are most likely to accumulate.
Practitioner takeaway: The safest EBS deployments are the ones where storage convenience, recovery design, and snapshot governance are planned together rather than handled as separate tasks.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on November 3, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org