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# AWS EC2 instance not configured with Instance Metadata Service v2 (IMDSv2) misconfiguration detected

## Rule Details

|                        |                                                       |
| ---------------------- | ----------------------------------------------------- |
| Cortex AppSec Rule ID  | APPSEC\_AWS\_79                                       |
| Category - Subcategory | Compute - Unsanctioned Resource Or Type               |
| Provider               | AWS                                                   |
| Severity               | HIGH                                                  |
| Framework              | CloudFormation, Serverless, Terraform, Terraform Plan |
| Mapped CSPM/KSPM Rule  | 81c165ce-f66e-441a-8ea0-56a107175ccc                  |

## Impact

The Instance Metadata Service (IMDS) is an on-instance component used by code on the instance to securely access instance metadata.

You can access instance metadata from a running instance using one of the following methods:

* Instance Metadata Service Version 1 (IMDSv1) -- a request/response method
* Instance Metadata Service Version 2 (IMDSv2) -- a session-oriented method

As a request/response method IMDSv1 is prone to local misconfigurations:

* Open proxies, open NATs and routers, server-side reflection vulnerabilities.
* One way or another, local software might access local-only data.

## How to Fix

*Resource:* AWS::EC2::LaunchTemplate

* *Arguments:* Properties.MetadataOptions.HttpEndpoint / Properties.MetadataOptions.HttpTokens \[source,go]

***

Resources: IMDSv1Disabled: Type: AWS::EC2::LaunchTemplate Properties: ... LaunchTemplateData: ...

* MetadataOptions:
* HttpEndpoint: disabled

IMDSv2Enabled: Type: AWS::EC2::LaunchTemplate Properties: ... LaunchTemplateData: ...

* MetadataOptions:
* HttpTokens: required

***


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