63 lines
1.6 KiB
YAML
63 lines
1.6 KiB
YAML
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id: nacl-outbound-restrict
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info:
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name: Unrestricted NACL Outbound Traffic
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author: princechaddha
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severity: medium
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description: |
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Checks for Amazon VPC NACLs allowing outbound traffic to all ports, recommending restriction to necessary ports only.
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impact: |
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Potential for data exfiltration or unauthorized access if outbound traffic is not properly restricted.
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remediation: |
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Modify NACL outbound rules to limit traffic to only the ports required for legitimate business needs.
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reference:
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- https://docs.aws.amazon.com/vpc/latest/userguide/vpc-network-acls.html
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tags: cloud,devops,aws,amazon,vpc,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 NACLIDs of template.nacls){
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set("naclid", NACLIDs)
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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-network-acls --region $region --query 'NetworkAcls[*].NetworkAclId' --output json
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extractors:
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- type: json
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name: nacls
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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-network-acls --region $region --network-acl-ids $naclid --query 'NetworkAcls[*].Entries[?(RuleAction==`allow`) && (Egress==`true`)] | []'
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matchers-condition: and
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matchers:
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- type: word
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words:
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- "allow"
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condition: and
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- type: word
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words:
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- "PortRange"
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negative: true
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extractors:
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- type: dsl
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dsl:
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- '"Access to the VPC subnets associated with your NACL " + naclid + " is not restricted."'
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