What is Bucket Squatting?
Bucket squatting is a type of attack where an attacker predicts the name of a cloud storage bucket and creates it in their own project before the intended owner does. This can lead to security issues if the attacker can manipulate the bucket's contents or intercept requests meant for the legitimate owner.
The Vulnerability in Vertex AI SDK
The Vertex AI SDK for Python, used for building, training, and deploying AI agents on Google Cloud, has a design flaw that could allow attackers to hijack and poison AI models. According to Unit 42 researchers, this flaw is caused by a combination of bad bucket naming logic and missing authentication.
How the Attack Works
An attacker can hijack a victim's project by knowing their project ID and region. Since no two buckets across all of Google Cloud can share the same name, an attacker who can predict a bucket name can preemptively create it in their own project. Any subsequent attempt to use a bucket with that name, even from a different project, silently falls back to the attacker's bucket.
Implications and Prevention
This vulnerability highlights the importance of secure bucket naming and authentication in cloud-based AI development. Developers should be aware of the risks of bucket squatting and take steps to prevent it, such as using unique and unpredictable bucket names, and implementing proper authentication and authorization mechanisms.