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37 lines
1.6 KiB
YAML
37 lines
1.6 KiB
YAML
id: ec2-unrestricted-dns
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info:
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name: Unrestricted DNS Access in EC2
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author: princechaddha
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severity: critical
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description: |
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Checks for inbound rules in Amazon EC2 security groups that allow unrestricted access (0.0.0.0/0 or ::/0) on TCP/UDP port 53, which can expose DNS servers to potential attacks.
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impact: |
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Allowing unrestricted access to DNS services can lead to DNS spoofing, DDoS attacks, and unauthorized access to internal networks.
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remediation: |
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Restrict the inbound rules for TCP/UDP port 53 in EC2 security groups to known, trusted IPs only. Ensure security group rules are tightly controlled and monitored.
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reference:
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- https://docs.aws.amazon.com/vpc/latest/userguide/VPC_SecurityGroups.html#SecurityGroupRules
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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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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-security-groups --region $region --filters Name=ip-permission.from-port,Values=53 Name=ip-permission.to-port,Values=53 Name=ip-permission.cidr,Values='0.0.0.0/0' --output json --query 'SecurityGroups[*].GroupId'
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extractors:
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- type: json
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name: securitygroup
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internal: true
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json:
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- '.[]'
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- type: dsl
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dsl:
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- 'securitygroup + " security group(s) alows unrestricted access (0.0.0.0/0 or ::/0) on TCP port 53"'
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# digest: 4b0a004830460221008233370a72ac39d30f1ee1f45b7463c5c185e4dc358c70084bab7c8666bc7c9f022100bb44c563dde300e18db8520fe30bc8e0b61b66002a09f78c3d8dee78042eaf81:922c64590222798bb761d5b6d8e72950 |