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Carlos Polop
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# AWS - CodeBuild Post Exploitation
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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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## CodeBuild
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For more information, check:
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{% content-ref url="../../aws-services/aws-codebuild-enum.md" %}
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[aws-codebuild-enum.md](../../aws-services/aws-codebuild-enum.md)
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{% endcontent-ref %}
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### Check Secrets
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If credentials have been set in Codebuild to connect to Github, Gitlab or Bitbucket in the form of personal tokens, passwords or OAuth token access, these **credentials are going to be stored as secrets in the secret manager**.\
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Therefore, if you have access to read the secret manager you will be able to get these secrets and pivot to the connected platform.
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{% content-ref url="../../aws-privilege-escalation/aws-secrets-manager-privesc.md" %}
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[aws-secrets-manager-privesc.md](../../aws-privilege-escalation/aws-secrets-manager-privesc.md)
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{% endcontent-ref %}
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### Abuse CodeBuild Repo Access
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In order to configure **CodeBuild**, it will need **access to the code repo** that it's going to be using. Several platforms could be hosting this code:
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<figure><img src="../../../../.gitbook/assets/image (96).png" alt=""><figcaption></figcaption></figure>
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The **CodeBuild project must have access** to the configured source provider, either via **IAM role** of with a github/bitbucket **token or OAuth access**.
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An attacker with **elevated permissions in over a CodeBuild** could abuse this configured access to leak the code of the configured repo and others where the set creds have access.\
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In order to do this, an attacker would just need to **change the repository URL to each repo the config credentials have access** (note that the aws web will list all of them for you):
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<figure><img src="../../../../.gitbook/assets/image (107).png" alt=""><figcaption></figcaption></figure>
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And **change the Buildspec commands to exfiltrate each repo**.
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{% hint style="warning" %}
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However, this **task is repetitive and tedious** and if a github token was configured with **write permissions**, an attacker **won't be able to (ab)use those permissions** as he doesn't have access to the token.\
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Or does he? Check the next section
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{% endhint %}
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### Leaking Access Tokens from AWS CodeBuild
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You can leak access given in CodeBuild to platforms like Github. Check if any access to external platforms was given with:
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```bash
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aws codebuild list-source-credentials
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```
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{% content-ref url="aws-codebuild-token-leakage.md" %}
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[aws-codebuild-token-leakage.md](aws-codebuild-token-leakage.md)
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{% endcontent-ref %}
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### `codebuild:DeleteProject`
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An attacker could delete an entire CodeBuild project, causing loss of project configuration and impacting applications relying on the project.
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```bash
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aws codebuild delete-project --name <value>
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```
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**Potential Impact**: Loss of project configuration and service disruption for applications using the deleted project.
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### `codebuild:TagResource` , `codebuild:UntagResource`
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An attacker could add, modify, or remove tags from CodeBuild resources, disrupting your organization's cost allocation, resource tracking, and access control policies based on tags.
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```bash
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aws codebuild tag-resource --resource-arn <value> --tags <value>
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aws codebuild untag-resource --resource-arn <value> --tag-keys <value>
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```
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**Potential Impact**: Disruption of cost allocation, resource tracking, and tag-based access control policies.
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### `codebuild:DeleteSourceCredentials`
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An attacker could delete source credentials for a Git repository, impacting the normal functioning of applications relying on the repository.
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```sql
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aws codebuild delete-source-credentials --arn <value>
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```
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**Potential Impact**: Disruption of normal functioning for applications relying on the affected repository due to the removal of source credentials.
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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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