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Introduction to GCP Privilege Escalation

GCP, as any other cloud, have some principals: users, groups and service accounts, and some resources like compute engine, cloud functions…
Then, via roles, permissions are granted to those principals over the resources. This is the way to specify the permissions a principal has over a resource in GCP.
There are certain permissions that will allow a user to get even more permissions on the resource or third party resources, and that’s what is called privilege escalation (also, the exploitation the vulnerabilities to get more permissions).

Therefore, I would like to separate GCP privilege escalation techniques in 2 groups:

  • Privesc to a principal: This will allow you to impersonate another principal, and therefore act like it with all his permissions. e.g.: Abuse getAccessToken to impersonate a service account.
  • Privesc on the resource: This will allow you to get more permissions over the specific resource. e.g.: you can abuse setIamPolicy permission over cloudfunctions to allow you to trigger the function.
    • Note that some resources permissions will also allow you to attach an arbitrary service account to the resource. This means that you will be able to launch a resource with a SA, get into the resource, and steal the SA token. Therefore, this will allow to escalate to a principal via a resource escalation. This has happened in several resources previously, but now it’s less frequent (but can still happen).

Obviously, the most interesting privilege escalation techniques are the ones of the second group because it will allow you to get more privileges outside of the resources you already have some privileges over. However, note that escalating in resources may give you also access to sensitive information or even to other principals (maybe via reading a secret that contains a token of a SA).

{% hint style="warning" %} It's important to note also that in GCP Service Accounts are both principals and permissions, so escalating privileges in a SA will allow you to impersonate it also. {% endhint %}

{% hint style="info" %} The permissions between parenthesis indicate the permissions needed to exploit the vulnerability with gcloud. Those might not be needed if exploiting it through the API. {% endhint %}

Privilege Escalation to Principals

Check all the known permissions that will allow you to escalate privileges over other principals in:

{% content-ref url="gcp-privesc-to-other-principals.md" %} gcp-privesc-to-other-principals.md {% endcontent-ref %}

Privilege Escalation to Resources

Check all the known permissions that will allow you to escalate privileges over other resources in:

{% content-ref url="gcp-privesc-to-resources.md" %} gcp-privesc-to-resources.md {% endcontent-ref %}

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