A.8.12 Data leakage prevention
Every system, network and other device that handles, holds or sends sensitive information is to be covered by measures that stop data leaking. Purpose (stated in ISO/IEC 27002:2022): spots and stops information being disclosed or taken out without authorization. As an Annex A reference control, it is compared with the controls determined in risk treatment (6.1.3 c) and recorded in the Statement of Applicability as included or excluded, with the justification and implementation status (6.1.3 d); implementation guidance is ISO/IEC 27002:2022 8.12.
Source: ISO/IEC 27001:2022, A.8.12. The statement above is our statement of the clause, read from the published text and cited so you can check it against the official text, not the instrument verbatim. Open ISO/IEC 27001:2022 in the compliance library.
Clauses 4 to 10 are the management-system requirements: none of them can be excluded when an organisation claims conformity. The 93 Annex A controls are a reference set: one may be excluded with a justification in the Statement of Applicability. Certification bodies assess conformity; the evidence lists here are what auditors commonly ask for, not a list the standard prescribes.
These are the artefacts auditors commonly ask for on this requirement, our guidance rather than text from the standard. Your assessor decides what is sufficient in your context, and asks for samples across the period when a report covers one.
system holds itEvidence a system already holds
- DLP policies and rules covering email, web uploads, file transfer, endpoints and removable storage, with the actions taken (alert, quarantine, block) · Endpoint management (MDM / EDR)
- DLP alert and incident records with triage and follow-up · SIEM / log platform
- Controls restricting copy, paste and upload outside the organization, such as virtual desktop or browser isolation settings, where the organization decided they are needed · Cloud console / configuration management
periodic reviewEvidence produced at each review
none for this control
governing documentDocuments that govern the control
- Statement of Applicability entry for control A.8.12, showing inclusion or justified exclusion, implementation status and the risks it treats · Policy repository / GRC workspace
- An inventory of information types and classifications in scope for leakage protection · Policy repository / GRC workspace
First move
Common gaps auditors find
- DLP runs in monitor-only mode indefinitely and nobody reviews alerts
- Rules cover email but not cloud uploads or personal webmail
- Sensitive data is not classified, so DLP rules cannot target it
- Backups holding sensitive data are unencrypted
Do this for your whole sheet
Paste the rows you run your controls from and get this mapping for every control at once, with the periodic-review ones flagged and a first move per row. No account for the first run.
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