# GCP - Artifact Registry Persistence
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## Artifact Registry
For more information about Artifact Registry check:
{% content-ref url="../gcp-services/gcp-artifact-registry-enum.md" %}
[gcp-artifact-registry-enum.md](../gcp-services/gcp-artifact-registry-enum.md)
{% endcontent-ref %}
### Dependency Confusion
* What happens if a **remote and a standard** repositories **are mixed in a virtual** one and a package exists in both?
* The one with the **highest priority set in the virtual repository** is used
* If the **priority is the same**:
* If the **version** is the **same**, the **policy name alphabetically** first in the virtual repository is used
* If not, the **highest version** is used
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Therefore, it's possible to **abuse a highest version (dependency confusion)** in a public package registry if the remote repository has a higher or same priority
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This technique can be useful for **persistence** and **unauthenticated access** as to abuse it it just require to **know a library name** stored in Artifact Registry and **create that same library in the public repository (PyPi for python for example)** with a higher version.
For persistence these are the steps you need to follow:
* **Requirements**: A **virtual repository** must **exist** and be used, an **internal package** with a **name** that doesn't exist in the **public repository** must be used.
* Create a remote repository if it doesn't exist
* Add the remote repository to the virtual repository
* Edit the policies of the virtual registry to give a higher priority (or same) to the remote repository.\
Run something like:
* [gcloud artifacts repositories update --upstream-policy-file ...](https://cloud.google.com/sdk/gcloud/reference/artifacts/repositories/update#--upstream-policy-file)
* Download the legit package, add your malicious code and register it in the public repository with the same version. Every time a developer installs it, he will install yours!
For more information about dependency confusion check:
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