Ec2 instances exist with default groups and public remediation

Using Console

Using CLI

To remediate the misconfiguration of the default security group being publicly accessible in AWS, you can follow these steps using the AWS CLI:

List all the security groups in your AWS account to identify the default security group:

aws ec2 describe-security-groups --query "SecurityGroups[?GroupName=='default']"

Get the Group ID of the default security group from the output of the above command.
Update the inbound rules of the default security group to restrict access. You can remove the existing rules or update them to allow access only from specific IP ranges or security groups. For example, to remove all inbound rules from the default security group:

aws ec2 revoke-security-group-ingress --group-id <YOUR_DEFAULT_SECURITY_GROUP_ID> --protocol -1 --source-group all

Verify that the inbound rules have been updated successfully by describing the security group:

aws ec2 describe-security-groups --group-ids <YOUR_DEFAULT_SECURITY_GROUP_ID>

By following these steps, you can ensure that the default security group in your AWS account is no longer publicly accessible.

Using Python

To remediate the misconfiguration of the default security group being publicly accessible in AWS using Python, you can follow these steps:

Use the AWS SDK for Python (Boto3) to programmatically update the inbound rules of the default security group to restrict access.
Here’s a sample Python script that demonstrates how to update the default security group to allow only specific IP ranges or ports:

import boto3

# Initialize the EC2 client
ec2 = boto3.client('ec2')

# Get the default security group ID
response = ec2.describe_security_groups(GroupNames=['default'])
default_security_group_id = response['SecurityGroups'][0]['GroupId']

# Revoke existing inbound rules that allow all traffic
ec2.revoke_security_group_ingress(
    GroupId=default_security_group_id,
    IpPermissions=[
        {
            'IpProtocol': '-1',
            'IpRanges': [{'CidrIp': '0.0.0.0/0'}]
        }
    ]
)

# Add new inbound rules to allow specific IP ranges or ports
ec2.authorize_security_group_ingress(
    GroupId=default_security_group_id,
    IpPermissions=[
        {
            'IpProtocol': 'tcp',
            'FromPort': 22,
            'ToPort': 22,
            'IpRanges': [{'CidrIp': 'YOUR_IP_RANGE'}]
        },
        {
            'IpProtocol': 'tcp',
            'FromPort': 80,
            'ToPort': 80,
            'IpRanges': [{'CidrIp': 'YOUR_IP_RANGE'}]
        }
    ]
)

print('Default security group remediated successfully.')

Replace 'YOUR_IP_RANGE' with the specific IP range or port that you want to allow access to. You can add multiple rules as needed.
Run this Python script in your AWS environment with the necessary IAM permissions to update security groups.

By following these steps, you can remediate the misconfiguration of the default security group being publicly accessible in AWS using Python.

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Ec2 instances exist with default groups and public remediation

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