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72 lines
4.9 KiB
Markdown
72 lines
4.9 KiB
Markdown
# GCP - Cloud Build Unauthenticated 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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## Cloud Build
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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.yml
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If you compromise write access over a repository containing a file named **`cloudbuild.yml`**, you could **backdoor** this file, which specifies the **commands that are going to be executed** inside a Cloud Build and exfiltrate the secrets, compromise what is done and also compromise the **Cloud Build service account.**
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{% hint style="info" %}
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Note that GCP has the option to allow administrators to control the execution of build systems from external PRs via "Comment Control". Comment Control is a feature where collaborators/project owners **need to comment “/gcbrun” to trigger the build** against the PR and using this feature inherently prevents anyone on the internet from triggering your build systems.
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{% endhint %}
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For some related information you could check the page about how to attack Github Actions (similar to this):
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{% content-ref url="../../../pentesting-ci-cd/github-security/abusing-github-actions/" %}
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[abusing-github-actions](../../../pentesting-ci-cd/github-security/abusing-github-actions/)
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{% endcontent-ref %}
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### PR Approvals
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When the trigger is PR because **anyone can perform PRs to public repositories** it would be very dangerous to just **allow the execution of the trigger with any PR**. Therefore, by default, the execution will only be **automatic for owners and collaborators**, and in order to execute the trigger with other users PRs an owner or collaborator must comment `/gcbrun`.
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<figure><img src="../../../.gitbook/assets/image (339).png" alt="" width="563"><figcaption></figcaption></figure>
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{% hint style="danger" %}
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Therefore, is this is set to **`Not required`**, an attacker could perform a **PR to the branch** that will trigger the execution adding the malicious code execution to the **`cloudbuild.yml`** file and compromise the cloudbuild execution (note that cloudbuild will download the code FROM the PR, so it will execute the malicious **`cloudbuild.yml`**).
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{% endhint %}
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Moreover, it's easy to see if some cloudbuild execution needs to be performed when you send a PR because it appears in Github:
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<figure><img src="../../../.gitbook/assets/image (340).png" alt=""><figcaption></figcaption></figure>
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{% hint style="warning" %}
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Then, even if the cloudbuild is not executed the attacker will be able to see the **project name of a GCP project** that belongs to the company.
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{% endhint %}
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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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|
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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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