What Security Leaders Need to Know About ISO27040 – Storage & Backup Security
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For years, enterprise security programs have focused heavily on endpoints, networks, and applications – while storage and backup systems quietly became one of the most attractive attack surfaces in the environment. That gap is now impossible to ignore.
The release of ISO/IEC 27040:2024 – Storage Security marks a pivotal moment for enterprises that care about cyber resilience and recoverability. It is the first truly comprehensive, globally recognized standard dedicated specifically to securing storage and backup systems – and its timing couldn’t be more critical.
Storage and Backup: The Last Line of Defense – and a Prime Target
Attackers are exploiting the fact that storage and backup environments are often less monitored, less hardened, and poorly integrated into vulnerability management programs. In many organizations, storage & backup systems still operate with legacy protocols, excessive privileges, weak authentication, and minimal logging – conditions that attackers actively seek out.
The consequences are severe: data theft, data destruction, operational disruption, regulatory exposure, and long-term reputational damage.
What Makes ISO/IEC 27040 Different – and Important
ISO/IEC 27040:2024 is not a minor update. It is a major overhaul of the outdated 2015 edition, designed to reflect modern storage architectures, threat models, and regulatory expectations.
Key characteristics include:
- 220 storage security guidelines, with 188 defined controls that establish a baseline for secure storage operations
- A clear distinction between guidance and mandatory requirements, particularly around encryption, logging, access control, protocol hardening, and secure sanitization
- Deep alignment with the broader ISO/IEC 27000 family, including ISO 27001 and ISO 27002, ensuring storage security is integrated into existing governance frameworks rather than treated as a side project
Most importantly, ISO 27040 acknowledges that storage security drifts over time. Configuration changes, firmware upgrades, evolving vendor guidance, and newly discovered vulnerabilities all erode security posture unless continuously validated.
From Policy to Practice: What ISO 27040 Actually Requires
Unlike high-level security frameworks, ISO 27040 goes deep into the technical realities of storage & backup environments. It covers:
- Strong authentication and access control, including multi-factor authentication and separation of duties
- Encryption requirements for data at rest and in motion, with minimum cryptographic strength
- Protocol hardening, including secure configurations for NFS, SMB, iSCSI, Fibre Channel, NVMe, and object storage
- Comprehensive logging and monitoring, with protected log retention
- Immutability, snapshots, replication, and cyber-recovery backups, recognizing storage as the backbone of resilience
- Vendor access restrictions and secure remote management
These controls map directly to real-world attack techniques observed in recent storage and backup breaches & ransomware incidents.
How StorageGuard helps you comply with ISO/IEC 27040
Required by ISO, Provided by StorageGuard
StorageGuard is the only Security Posture Management solution purpose-built for enterprise storage and backup systems.
- Ensure adequate storage & backup protection expertise
- Ensure adequate storage & backup security expertise
- Perform storage & backup system hardening
- Apply vendor-recommend security configurations for all storage & backup systems
- Include storage & backup in vulnerability management programs
ISO 27040 Is a Baseline – Not the Finish Line
One of the most important messages in ISO 27040 is that documentation alone is not enough. The standard repeatedly emphasizes validation, testing, and continuous assessment.
This is especially critical for storage and backup environments, where traditional vulnerability scanners often lack deep coverage, misconfigurations can persist unnoticed for years, and security posture can change overnight due to upgrades or operational changes.
Organizations that treat ISO 27040 as a one-time compliance exercise will miss its real value. Those that operationalize it by continuously assessing, hardening, and monitoring storage & backup security will significantly improve their cyber resilience.
Final Thoughts
Storage and backup systems are no longer passive infrastructure components. They are strategic security assets – and, if neglected, strategic liabilities.
ISO/IEC 27040:2024 provides a long-overdue, authoritative blueprint for protecting the systems that ultimately determine whether an organization can recover from a cyberattack.
If your storage & backup systems are not secure, your security program is not complete.
Tech controls required by ISO, audited (and potentially enforced) by StorageGuard
| Control | ID |
| TC-BBFC-G01 Using FC LUN masking and mapping | 10.9.1 |
| TC-BBFC-G02 Using FCP for SCSI security measures | 10.9.1 |
| TC-BBFC-G03 Using data at rest encryption for FC storage | 10.9.1 |
| TC-CNFD-G11 Providing end-to-end security protections for data in motion | 10.5.4.1 |
| TC-CNFD-G15 Limiting plaintext exposure of plaintext keys | 10.5.5 |
| TC-CNFD-G16 Using centralized key management infrastructure | 10.5.5 |
| TC-CNFD-R01 Use cryptography with at least 128 bits of security strength | 10.5.3 |
| TC-CNFD-R02 TLS minimum requirements | 10.5.4.2 |
| TC-CNFD-R03 IPsec minimum requirements | 10.5.4.3 |
| TC-DSGN-G01 Adhering to core security design principles | 10.2.1 |
| TC-FBNF-G01 Securing data on NFS servers | 10.10.2 |
| TC-FBNF-R01 Apply NFS access controls | 10.10.2 |
| TC-FBNF-R02 Restrict NFS client behaviours | 10.10.2 |
| TC-FBSM-G01 Securing data on SMB servers | 10.10.3 |
| TC-FBSM-R01 Minimum acceptable SMB protocol | 10.10.3 |
| TC-FBSM-R02 Apply SMB access controls | 10.10.3 |
| TC-FBSM-R03 Restrict SMB client behaviours | 10.10.3 |
| TC-FCSS-G01 Controlling FCP node access | 10.8.2.2 |
| TC-FCSS-G02 Using FC switch-based controls | 10.8.2.2 |
| TC-FCSS-G03 Configuring FC device to meet security requirements | 10.8.2.2 |
| TC-HARD-G03 Ensuring completeness of storage audit logging | 10.3.2 |
| TC-HARD-G04 Implementing appropriate monitoring of storage | 10.3.2 |
| TC-HARD-G05 Using log retention and protection for storage | 10.3.2 |
| TC-HARD-R01 Perform logging on storage | 10.3.2 |
| TC-IPSS-G01 Using iSCSI network access and protocols | 10.8.2.3 |
| TC-IPSS-G02 Using FCIP network access and protocols | 10.8.2.3 |
| TC-IPSS-G03 Using IPsec to secure FCIP | 10.8.2.3 |
| TC-MGMT-G01 Using centralized authentication solutions | 10.4.2.1 |
| TC-MGMT-G02 Using multi-factor authentication | 10.4.2.1 |
| TC-MGMT-G03 Disabling login to the root or admin account | 10.4.2.1 |
| TC-MGMT-G04 Remotely logging all privilege escalation operations | 10.4.2.1 |
| TC-MGMT-G06 Separating security and non-security roles | 10.4.2.2 |
| TC-MGMT-G07 Securing the network interfaces to management software/firmware | 10.4.3 |
| TC-MGMT-R01 Minimum user authentication measures | 10.4.2.1 |
| TC-MGMT-R02 Secure the remote management | 10.4.3 |
| TC-MGMT-R03 Restrict vendor remote management | 10.4.3 |
| TC-MGMT-R04 Restrict dial-up access use | 10.4.3 |
| TC-MGMT-R05 Secure IPMI | 10.4.3 |
| TC-NASP-G01 Using NFS network access and protocols | 10.8.3.2 |
| TC-NASP-G02 Using encryption to secure NFS | 10.8.3.2 |
| TC-NASP-G03 Using SMB network access and protocols | 10.8.3.3 |
| TC-OBSS-G01 Using transport security for object-based storage transactions | 10.12 |
| TC-OBSS-G02 Using data at rest encryption for object-based storage | 10.12 |
| TC-OBSS-G03 Enabling data immutability for object-based storage | 10.12 |
| TC-PROT-G02 Using data backup measures and operations securely | 10.14.2 |
| TC-PROT-G03 Using cyber-attack recovery backups | 10.14.2 |
| TC-PROT-G04 Using data replication measures and operations securely | 10.14.3 |
| TC-PROT-G05 Using snapshots in conjunction with backups | 10.14.4 |
| TC-PROT-G06 Using snapshot security | 10.14.4 |
Frequently Asked Questions (FAQs)
Why is ISO/IEC 27040 important for cybersecurity?
ISO/IEC 27040 is important because storage and backup systems are increasingly targeted by ransomware and data-destructive attacks. The standard addresses long-standing security gaps by defining controls for encryption, access management, logging, protocol hardening, and data immutability—areas often overlooked by traditional security programs.
How does ISO/IEC 27040 relate to ISO 27001 and ISO 27002?
ISO/IEC 27040 complements ISO 27001 and ISO 27002 by providing storage-specific security guidance that those standards do not cover in detail. While ISO 27001 defines information security management requirements and ISO 27002 lists general controls, ISO 27040 explains how to apply security controls specifically to storage, backup, and data protection technologies.
What are the main security controls required by ISO/IEC 27040?
ISO/IEC 27040 defines controls across encryption, authentication, access control, logging, monitoring, protocol security, vendor access management, and secure data sanitization of storage and backup systems. Many requirements focus on eliminating insecure legacy protocols, enforcing minimum cryptographic strength, and continuously validating storage and backup security configurations.
How does ISO/IEC 27040 impact audits and compliance?
ISO/IEC 27040 is increasingly used by auditors to assess whether organizations adequately protect storage and backup systems. While not a certification standard itself, it provides detailed criteria that auditors may use to evaluate compliance with ISO 27001, regulatory requirements, and cyber resilience expectations.
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