Security News > 2023 > July > Google Cloud Build bug lets hackers launch supply chain attacks

A critical design flaw in the Google Cloud Build service discovered by cloud security firm Orca Security can let attackers escalate privileges, providing them with almost nearly-full and unauthorized access to Google Artifact Registry code repositories.

Dubbed Bad.Build, this flaw could enable the threat actors to impersonate the service account for the Google Cloud Build managed continuous integration and delivery service to run API calls against the artifact registry and take control over application images.

Still, their method to exploit this privilege escalation flaw was more complex, involving the use of the GCP API and exfiltrated Cloud Build Service Account access tokens.

"It's therefore important that organizations pay close attention to the behavior of the default Google Cloud Build service account. Applying the Principle of Least Privilege and implementing cloud detection and response capabilities to identify anomalies are some of the recommendations for reducing risk."

Google Cloud Build customers are advised to modify the default Cloud Build Service Account permissions to match their needs and remove entitlement credentials that go against the Principle of Least Privilege to mitigate the privilege escalation risks.

In April, Google also addressed a Google Cloud Platform security vulnerability dubbed GhostToken that let attackers backdoor any Google account using malicious OAuth applications.

News URL

https://www.bleepingcomputer.com/news/security/google-cloud-build-bug-lets-hackers-launch-supply-chain-attacks/