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Carlos Polop
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# GCP - Cloudbuild Privesc
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="../../../.gitbook/assets/image (1) (1) (1) (1).png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="../../../.gitbook/assets/image (1) (1) (1) (1).png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="../../../.gitbook/assets/image (2) (1).png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="../../../.gitbook/assets/image (2) (1).png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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## cloudbuild
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For more information about Cloud Build check:
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{% content-ref url="../gcp-services/gcp-cloud-build-enum.md" %}
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[gcp-cloud-build-enum.md](../gcp-services/gcp-cloud-build-enum.md)
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{% endcontent-ref %}
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### `cloudbuild.builds.create`
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With this permission you can **submit a cloud build**. The cloudbuild machine will have in it’s filesystem by **default a token of the cloudbuild Service Account**: `<PROJECT_NUMBER>@cloudbuild.gserviceaccount.com`. However, you can **indicate any service account inside the project** in the cloudbuild configuration.\
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Therefore, you can just make the machine exfiltrate to your server the token or **get a reverse shell inside of it and get yourself the token** (the file containing the token might change).
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You can find the original exploit script [**here on GitHub**](https://github.com/RhinoSecurityLabs/GCP-IAM-Privilege-Escalation/blob/master/ExploitScripts/cloudbuild.builds.create.py) (but the location it's taking the token from didn't work for me). Therefore, check a script to automate the [**creation, exploit and cleaning of a vuln environment here**](https://github.com/carlospolop/gcp_privesc_scripts/blob/main/tests/f-cloudbuild.builds.create.sh) and a python script to get a reverse shell inside the cloudbuild machine and [**steal it here**](https://github.com/carlospolop/gcp_privesc_scripts/blob/main/tests/f-cloudbuild.builds.create.py) (in the code you can find how to specify other service accounts)**.**
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For a more in-depth explanation, visit [https://rhinosecuritylabs.com/gcp/iam-privilege-escalation-gcp-cloudbuild/](https://rhinosecuritylabs.com/gcp/iam-privilege-escalation-gcp-cloudbuild/)
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### `cloudbuild.builds.update`
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**Potentially** with this permission you will be able to **update a cloud build and just steal the service account token** like it was performed with the previous permission (but unfortunately at the time of this writing I couldn't find any way to call that API).
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TODO
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### `cloudbuild.repositories.accessReadToken`
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With this permission the user can get the **read access token** used to access the repository:
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{% code overflow="wrap" %}
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```bash
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curl -X POST \
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-H "Authorization: Bearer $(gcloud auth print-access-token)" \
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-H "Content-Type: application/json" \
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-d '{}' \
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"https://cloudbuild.googleapis.com/v2/projects/<PROJECT_ID>/locations/<LOCATION>/connections/<CONN_ID>/repositories/<repo-id>:accessReadToken"
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```
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{% endcode %}
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### `cloudbuild.repositories.accessReadWriteToken`
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With this permission the user can get the **read and write access token** used to access the repository:
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{% code overflow="wrap" %}
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```bash
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curl -X POST \
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-H "Authorization: Bearer $(gcloud auth print-access-token)" \
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-H "Content-Type: application/json" \
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-d '{}' \
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"https://cloudbuild.googleapis.com/v2/projects/<PROJECT_ID>/locations/<LOCATION>/connections/<CONN_ID>/repositories/<repo-id>:accessReadWriteToken"
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```
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{% endcode %}
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### `cloudbuild.connections.fetchLinkableRepositories`
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With this permission you can **get the repos the connection has access to:**
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{% code overflow="wrap" %}
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```bash
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curl -X GET \
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-H "Authorization: Bearer $(gcloud auth print-access-token)" \
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"https://cloudbuild.googleapis.com/v2/projects/<PROJECT_ID>/locations/<LOCATION>/connections/<CONN_ID>:fetchLinkableRepositories"
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```
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{% endcode %}
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="../../../.gitbook/assets/image (1) (1) (1) (1).png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="../../../.gitbook/assets/image (1) (1) (1) (1).png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="../../../.gitbook/assets/image (2) (1).png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="../../../.gitbook/assets/image (2) (1).png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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