Google Cloud Platform (GCP) SSRF on GCP Action Hub Extension to IP Restriction Bypass in Looker
LowSynopsis
Tenable Research has identified and responsibly disclosed a Server-Side Request Forgery (SSRF) vulnerability in the Google Cloud Platform (GCP) Action Hub used by Looker. This flaw allowed an attacker to bypass IP-based access restrictions on a Looker instance.
The vulnerability was found within the GCP Action Hub's DataRobot action. This action failed to adequately validate or sanitize user-supplied URLs. An authenticated user could exploit this weakness to craft a malicious payload that would cause the Action Hub's server to send requests to arbitrary internal endpoints.
This SSRF vulnerability allowed an attacker to bypass an IP allowlist on a Looker instance, effectively enabling them to probe internal APIs and services that are not meant to be internet-facing.
Proof of Concept:
- Go to Looker Admin → Actions
- Insert an SSRF URL in the DataRobot URL parameter, for example, http://localhost:8081
- Test the action
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Risk Information
Liv Matan
Moshe Bernstein
GCP Looker
GCP Action Hub
Low
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