GCP Audit Logs - Storage Bucket Made Public
Detects when a Google Cloud Storage bucket is made publicly accessible by granting permissions to allUsers or allAuthenticatedUsers. Making buckets public can expose sensitive data to unauthorized access and may…
Description
Detects when a Google Cloud Storage bucket is made publicly accessible by granting permissions to allUsers or allAuthenticatedUsers. Making buckets public can expose sensitive data to unauthorized access and may indicate a misconfiguration or malicious activity. Adversaries may make buckets public to exfiltrate data or as part of a data exposure attack. This rule monitors setIamPermissions operations that add public access roles to storage buckets.
Detection logic
Detection requirements
- Platform
- ESXiIaaSIdentity ProviderLinuxmacOSOffice SuiteSaaSWindows
The rule states no platform. This is derived from the 3 ATT&CK techniques it maps to.
- Log source product
- gcpauditlogsdefinition
- Log source service
- gcpauditlogs
MITRE ATT&CK mappings
0 exclusive techniques.This is coverage no other published rule has; it is not this rule's total technique count.
No references are available for this detection.
From the source
- At source
- Open at source
- Upstream identifier
- 3a8d7f9e-4b2c-4e5d-8c6b-9f1a3d5e8c7b
- Tagged by the source as
- CollectionExfiltrationInitialAccess
Licence
- Published under
- MIT LicenseRead the licence
- Attribution
- Required
- Obtained under
- MITRead the origin licence
Authorship
- Published
- Sep 1, 2026
- Version
- 1