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74 lines
4.6 KiB
Markdown
74 lines
4.6 KiB
Markdown
# GCP - Cloud Scheduler Enum
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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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## Basic Information
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Google Cloud Scheduler is a fully managed **cron job service** that allows you to run arbitrary jobs—such as batch, big data jobs, cloud infrastructure operations—at fixed times, dates, or intervals. It is integrated with Google Cloud services, providing a way to **automate various tasks like updates or batch processing on a regular schedule**.
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Although from an offensive point of view this sounds amazing, it actually isn't that interesting because the service just allow to schedule certain simple actions at a certain time and not to execute arbitrary code.
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At the moment of this writing these are the actions this service allows to schedule:
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<figure><img src="../../../.gitbook/assets/image (347).png" alt="" width="563"><figcaption></figcaption></figure>
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* **HTTP**: Send an HTTP request defining the headers and body of the request.
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* **Pub/Sub**: Send a message into an specific topic
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* **App Engine HTTP**: Send an HTTP request to an app built in App Engine
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* **Workflows**: Call a GCP Workflow.
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## Service Accounts
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A service account is not always required by each scheduler. The **Pub/Sub** and **App Engine HTTP** types don't require any service account. The **Workflow** does require a service account, but it'll just invoke the workflow.\
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Finally, the regular HTTP type doesn't require a service account, but it's possible to indicate that some kind of auth is required by the workflow and add either an **OAuth token or an OIDC token to the sent** HTTP request.
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{% hint style="danger" %}
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Therefore, it's possible to steal the **OIDC** token and abuse the **OAuth** token from service accounts **abusing the HTTP type**. More on this in the privilege escalation page.
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{% endhint %}
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Note that it's possible to limit the scope of the OAuth token sent, however, by default, it'll be `cloud-platform`.
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## Enumeration
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```bash
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# Get schedulers in a location
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gcloud scheduler jobs list --location us-central1
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# Get information of an specific scheduler
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gcloud scheduler jobs describe --location us-central1 <scheduler-name>
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```
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## Privilege Escalation
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{% content-ref url="../gcp-privilege-escalation/gcp-cloudscheduler-privesc.md" %}
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[gcp-cloudscheduler-privesc.md](../gcp-privilege-escalation/gcp-cloudscheduler-privesc.md)
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{% endcontent-ref %}
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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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|
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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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