5.27 Learning from information security incidents
Requires knowledge gained from information security incidents to be fed back into strengthening and improving the information security controls.
5
artefacts
0
held by a system
2
at each review
hard
to go live
Document repository
where the evidence lives
teal = a system already holds it · olive = produced at each review
system holds itEvidence a system already holds
none for this control
periodic reviewEvidence produced at each review
- Post incident review records for incidents meeting the defined threshold, with attendees and findings · Document repository
- Actions arising, with owner, due date and evidence of completion · Document repository
governing documentDocuments that govern the control
- Root cause analysis distinguishing the technical cause from the process or control failure that allowed it · Document repository
- Evidence that findings changed something concrete, such as a control strengthened, a procedure amended or a detection rule added · Policy repository / GRC workspace
- Trend analysis across incidents, showing recurring causes are identified as recurring · Document repository
First move
This control is evidenced by people and documents, not systems. Put the document under version control with an owner and review date, and log each review as a record with reviewer and date. Do not try to automate it.
Common gaps auditors find
- Reviews held for major incidents only, so the frequent low severity incidents that reveal the systemic weakness are never analysed
- Root cause recorded as human error, which closes the analysis before it reaches the control that should have prevented it
- Actions raised and left open indefinitely with no escalation
- No trend analysis, so the same cause is rediscovered independently several times
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.
Build my evidence sheet5.26 Response to information security incidents · 5.28 Collection of evidence