Policy default action full packets remediation

Using Console

Using CLI

To remediate the misconfiguration of the network firewall policy default action in AWS EC2 using AWS CLI, follow these steps:

Identify the Security Group: First, identify the security group associated with the EC2 instance that needs to be remediated. You can do this by either checking the EC2 instance details in the AWS Management Console or by using the following AWS CLI command:
```
aws ec2 describe-instances --instance-ids YOUR_INSTANCE_ID --query "Reservations[].Instances[].SecurityGroups[].GroupId" --output text
```

Update the Security Group: Once you have identified the security group, you can update the network firewall policy default action to “deny” for all inbound and outbound traffic using the following AWS CLI command:

aws ec2 update-security-group-rule-descriptions-ingress --group-id YOUR_SECURITY_GROUP_ID --ip-permissions '[{"IpProtocol": "-1", "PrefixListIds": [], "IpRanges": [], "UserIdGroupPairs": [], "Ipv6Ranges": [], "FromPort": -1, "ToPort": -1, "Description": "Deny all inbound traffic"}]'

aws ec2 update-security-group-rule-descriptions-egress --group-id YOUR_SECURITY_GROUP_ID --ip-permissions '[{"IpProtocol": "-1", "PrefixListIds": [], "IpRanges": [], "UserIdGroupPairs": [], "Ipv6Ranges": [], "FromPort": -1, "ToPort": -1, "Description": "Deny all outbound traffic"}]'

Verify the Changes: You can verify that the default action for full packets is now set to “deny” for both inbound and outbound traffic by checking the security group rules in the AWS Management Console or by using the following AWS CLI command:
```
aws ec2 describe-security-groups --group-ids YOUR_SECURITY_GROUP_ID
```

By following these steps, you can remediate the misconfiguration of the network firewall policy default action in AWS EC2 using AWS CLI.

Using Python

To remediate the network firewall policy default action setting for AWS EC2 using Python, you can use the AWS SDK for Python (Boto3) to update the Network ACL associated with the VPC. Here are the step-by-step instructions to remediate this misconfiguration:Step 1: Install Boto3 Ensure that you have Boto3 installed. You can install it using pip:

pip install boto3

Step 2: Write Python script Create a Python script with the following code to update the Network ACL default action for full packets:

import boto3

# Initialize the EC2 client
ec2_client = boto3.client('ec2')

# Specify the VPC ID
vpc_id = 'YOUR_VPC_ID'

# Specify the Network ACL ID
network_acl_id = 'YOUR_NETWORK_ACL_ID'

# Update the Network ACL entry to set the default action for full packets
response = ec2_client.create_network_acl_entry(
    CidrBlock='0.0.0.0/0',
    Egress=False,
    NetworkAclId=network_acl_id,
    Protocol='-1',
    RuleAction='allow',
    RuleNumber=100
)

print("Network ACL default action updated successfully.")

Replace YOUR_VPC_ID and YOUR_NETWORK_ACL_ID with the actual VPC ID and Network ACL ID where the misconfiguration exists.Step 3: Run the Python script Save the Python script and run it using the Python interpreter. This script will update the Network ACL entry to set the default action for full packets.

python remediate_network_acl.py

After running this script, the default action for full packets in the Network ACL should be set, remediating the misconfiguration.

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Policy default action full packets remediation

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