56 lines
1.9 KiB
YAML
56 lines
1.9 KiB
YAML
id: ec2-imdsv2
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info:
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name: Enforce IMDSv2 on EC2 Instances
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author: princechaddha
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severity: medium
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description: |
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Ensure all EC2 instances use Instance Metadata Service Version 2 (IMDSv2) for enhanced security when requesting instance metadata, protecting against certain types of attacks that target the older version, IMDSv1.
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impact: |
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Using IMDSv1 can expose EC2 instances to server-side request forgery (SSRF) attacks, potentially allowing attackers to access sensitive instance metadata.
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remediation: |
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Modify the EC2 instance metadata options to set `HttpTokens` to `required`, enforcing the use of IMDSv2. This can be done via the AWS Management Console, CLI, or EC2 API.
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reference:
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- https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/configuring-instance-metadata-service.html
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metadata:
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max-request: 2
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tags: cloud,devops,aws,amazon,ec2,aws-cloud-config
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variables:
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region: "us-east-1"
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flow: |
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code(1)
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for(let InstancesName of iterate(template.instances)){
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set("ec2instance", InstancesName)
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code(2)
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}
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self-contained: true
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code:
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- engine:
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- sh
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- bash
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source: |
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aws ec2 describe-instances --region $region --output table --query 'Reservations[*].Instances[*].InstanceId' --output json
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extractors:
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- type: json
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name: instances
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internal: true
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json:
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- '.[]'
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- engine:
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- sh
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- bash
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source: |
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aws ec2 describe-instances --region $region --instance-ids $ec2instance --query 'Reservations[*].Instances[*].MetadataOptions.HttpTokens[]'
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matchers:
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- type: word
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words:
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- "optional"
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extractors:
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- type: dsl
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dsl:
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- 'ami + " is publically shared"'
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# digest: 4a0a00473045022014b5f386ded068e3ca4990545da3f49124b5e48e86bea8ea94a380c367e3aeb9022100ed0ecb915d4c1b7be7a7906ffa2a55a2988669e3418301b6886a45df6a57b337:922c64590222798bb761d5b6d8e72950 |