AWS EBS Snapshot Made Public
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Goal
Detect when an EBS snapshot is made public.
Strategy
This rule lets you monitor these CloudTrail API calls to detect when an EBS snapshot is made public:
This rule inspects the @requestParameters.createVolumePermission.add.items.group array to determine if the string all is contained. This is the indicator which means the EBS snapshot is made public.
Triage and response
- Determine if the EBS snapshot should be made public.
- Determine which user,
{{@@userIdentity.arn}}, in your organization made the EBS snapshot public. - Contact the user to see if they intended to make the EBS snapshot public.
- If the user did not make the API call:
- Rotate the credentials.
- Investigate if the same credentials made other unauthorized API calls.
- Revert AMI permissions to the original state.
- Begin your company’s IR process and investigate.
Changelog
11 November 2022 - Added additional triage and response steps.
