# AWS - ECS Enum
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## ECS
### Basic Information
Amazon **Elastic Container Services** or ECS provides a platform to **host containerized applications in the cloud**. ECS has two **deployment** methods, **EC2** instance type and a **serverless** option, **Fargate**. The service **makes running containers in the cloud very easy and pain free**.
ECS operates using the following three building blocks: **Clusters**, **Services**, and **Task Definitions**.
* **Clusters** are **groups of containers** that are running in the cloud. As previously mentioned, there are two launch types for containers, EC2 and Fargate. AWS defines the **EC2** launch type as allowing customers “to run \[their] containerized applications on a cluster of Amazon EC2 instances that \[they] **manage**”. **Fargate** is similar and is defined as “\[allowing] you to run your containerized applications **without the need to provision and manage** the backend infrastructure”.
* **Services** are created inside a cluster and responsible for **running the tasks**. Inside a service definition **you define the number of tasks to run, auto scaling, capacity provider (Fargate/EC2/External),** **networking** information such as VPC’s, subnets, and security groups.
* There **2 types of applications**:
* **Service**: A group of tasks handling a long-running computing work that can be stopped and restarted. For example, a web application.
* **Task**: A standalone task that runs and terminates. For example, a batch job.
* Among the service applications, there are **2 types of service schedulers**:
* [**REPLICA**](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/ecs_services.html): The replica scheduling strategy places and **maintains the desired number** of tasks across your cluster. If for some reason a task shut down, a new one is launched in the same or different node.
* [**DAEMON**](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/ecs_services.html): Deploys exactly one task on each active container instance that has the needed requirements. There is no need to specify a desired number of tasks, a task placement strategy, or use Service Auto Scaling policies.
* **Task Definitions** are responsible for **defining what containers will run** and the various parameters that will be configured with the containers such as **port mappings** with the host, **env variables**, Docker **entrypoint**...
* Check **env variables for sensitive info**!
### Sensitive Data In Task Definitions
Task definitions are responsible for **configuring the actual containers that will be running in ECS**. Since task definitions define how containers will run, a plethora of information can be found within.
Pacu can enumerate ECS (list-clusters, list-container-instances, list-services, list-task-definitions), it can also dump task definitions.
### Enumeration
```bash
# Clusters info
aws ecs list-clusters
aws ecs describe-clusters --clusters
# Container instances
## An Amazon ECS container instance is an Amazon EC2 instance that is running the Amazon ECS container agent and has been registered into an Amazon ECS cluster.
aws ecs list-container-instances --cluster
aws ecs describe-container-instances --cluster --container-instances
# Services info
aws ecs list-services --cluster
aws ecs describe-services --cluster --services
aws ecs describe-task-sets --cluster --service
# Task definitions
aws ecs list-task-definition-families
aws ecs list-task-definitions
aws ecs list-tasks --cluster
aws ecs describe-tasks --cluster --tasks
## Look for env vars and secrets used from the task definition
aws ecs describe-task-definition --task-definition :
```
### Unauthenticated Access
{% content-ref url="../aws-unauthenticated-enum-access/aws-ecs-unauthenticated-enum.md" %}
[aws-ecs-unauthenticated-enum.md](../aws-unauthenticated-enum-access/aws-ecs-unauthenticated-enum.md)
{% endcontent-ref %}
### Privesc
In the following page you can check how to **abuse ECS permissions to escalate privileges**:
{% content-ref url="../aws-privilege-escalation/aws-ecs-privesc.md" %}
[aws-ecs-privesc.md](../aws-privilege-escalation/aws-ecs-privesc.md)
{% endcontent-ref %}
### Post Exploitation
{% content-ref url="../aws-post-exploitation/aws-ecs-post-exploitation.md" %}
[aws-ecs-post-exploitation.md](../aws-post-exploitation/aws-ecs-post-exploitation.md)
{% endcontent-ref %}
### Persistence
{% content-ref url="../aws-persistence/aws-ecs-persistence.md" %}
[aws-ecs-persistence.md](../aws-persistence/aws-ecs-persistence.md)
{% endcontent-ref %}
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Support HackTricks
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