An ingress security group rule allows traffic from /0.

Explanation

Opening up ports to the public internet is generally to be avoided. You should restrict access to IP addresses or ranges that explicitly require it where possible.

Possible Impact

Your port exposed to the internet

Suggested Resolution

Set a more restrictive cidr range

Insecure Example

The following example will fail the AVD-AWS-0107 check.

---
AWSTemplateFormatVersion: 2010-09-09
Description: Bad example of ingress rule
Resources:
  BadSecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupDescription: Limits security group egress traffic
      SecurityGroupIngress:
      - CidrIp: 80.1.2.3/32
        IpProtocol: "6"

Secure Example

The following example will pass the AVD-AWS-0107 check.

---
AWSTemplateFormatVersion: 2010-09-09
Description: Good example of ingress rule
Resources:
  BadSecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupDescription: Limits security group egress traffic
      SecurityGroupIngress:
      - CidrIp: 127.0.0.1/32
        IpProtocol: "6"


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