Deleteegressonlyinternetgateway remediation

​

Event Information

• The DeleteEgressOnlyInternetGateway event in AWS for EC2 refers to the deletion of an egress-only internet gateway.
• An egress-only internet gateway is a horizontally scaled, redundant, and highly available VPC component that allows outbound communication over IPv6 from instances in a VPC to the internet, while preventing inbound communication from the internet.
• This event indicates that the egress-only internet gateway has been successfully deleted, and any associated outbound IPv6 traffic will no longer be routed through it.

​

Examples

• Unauthorized deletion of an egress-only internet gateway can lead to a loss of network connectivity for EC2 instances in a VPC, potentially impacting the availability of applications and services.
• If an attacker gains access to delete an egress-only internet gateway, they may be able to bypass network security controls and exfiltrate sensitive data from EC2 instances.
• Deleting an egress-only internet gateway without proper authorization can disrupt network traffic flow and cause connectivity issues for EC2 instances, affecting the overall performance and user experience.

​

Remediation

​

Using Console

1. Example 1: Unauthorized Access to AWS EC2 Instance
   • Step 1: Identify the compromised EC2 instance by reviewing the event logs or security alerts.
   • Step 2: Terminate the compromised EC2 instance to prevent further unauthorized access.
   • Step 3: Launch a new EC2 instance with updated security configurations, such as using the latest AMI, applying security groups, and enabling necessary security features like AWS Systems Manager Session Manager or AWS CloudTrail.
2. Example 2: Unencrypted Data in AWS S3 Bucket
   • Step 1: Identify the S3 bucket containing unencrypted data by reviewing the event logs or security alerts.
   • Step 2: Enable default encryption for the S3 bucket to ensure that all objects stored in the bucket are automatically encrypted.
   • Step 3: Use AWS Key Management Service (KMS) to manage the encryption keys and ensure proper access controls are in place for the KMS key used for encryption.
3. Example 3: Excessive Permissions for AWS IAM User
   • Step 1: Identify the IAM user with excessive permissions by reviewing the IAM policies and access logs.
   • Step 2: Modify the IAM policy attached to the user to remove unnecessary permissions and restrict access to only the required resources.
   • Step 3: Regularly review and audit IAM policies to ensure that permissions are aligned with the principle of least privilege and follow the least privilege access model.

​

Using CLI

1. Ensure that all EC2 instances are using the latest Amazon Machine Images (AMIs) by regularly checking for updates and patching any vulnerabilities. Use the following AWS CLI commands:
   • List all EC2 instances: aws ec2 describe-instances
   • Identify instances with outdated AMIs: aws ec2 describe-images --owners amazon --filters "Name=name,Values=amzn-ami-hvm-*" --query 'Images[*].[ImageId,CreationDate]' --output text | sort -k2 | tail -n 1
   • Update the AMI for the identified instances: aws ec2 create-image --instance-id <instance-id> --name "Updated AMI" --description "Updated AMI for security patching"
   • Terminate the old instance and launch a new instance using the updated AMI.
2. Implement security groups and network ACLs to restrict inbound and outbound traffic to only necessary ports and protocols. Use the following AWS CLI commands:
   • List all security groups: aws ec2 describe-security-groups
   • Identify security groups with overly permissive rules: aws ec2 describe-security-groups --query 'SecurityGroups[?length(IpPermissions[?IpProtocol==\-1` || (IpProtocol==`tcp` && (ToPort==null || ToPort>65535)) || (IpProtocol==`udp` && (ToPort==null || ToPort>65535)) || (IpProtocol==`icmp` && (ToPort==null || ToPort>255)))])’`
   • Update the security group rules to allow only necessary traffic: aws ec2 revoke-security-group-ingress --group-id <security-group-id> --protocol <protocol> --port <port> --source <source-ip>
   • Repeat the above command for each unnecessary rule.
3. Enable AWS CloudTrail to monitor and log all API activity within your AWS account. Use the following AWS CLI commands:
   • Create a new S3 bucket to store CloudTrail logs: aws s3api create-bucket --bucket <bucket-name> --region <region>
   • Enable CloudTrail for your AWS account: aws cloudtrail create-trail --name <trail-name> --s3-bucket-name <bucket-name> --is-multi-region-trail
   • Start logging API activity: aws cloudtrail start-logging --name <trail-name>
   • Verify that CloudTrail is enabled and logging: aws cloudtrail describe-trails --trail-name-list <trail-name>

​

Using Python

1. Enforce encryption for EBS volumes:
   • Use the AWS SDK for Python (Boto3) to identify unencrypted EBS volumes.
   • Create a Python script that iterates through all EC2 instances and their attached volumes.
   • For each unencrypted volume, use the create_snapshot method to create a snapshot of the volume.
   • Use the copy_snapshot method to copy the snapshot and enable encryption during the copy process.
   • Once the encrypted snapshot is created, use the create_volume method to create a new encrypted volume.
   • Finally, detach the unencrypted volume and attach the newly created encrypted volume to the instance.
2. Enable VPC flow logs:
   • Use Boto3 to check if VPC flow logs are enabled for each VPC.
   • Create a Python script that iterates through all VPCs and checks if flow logs are enabled.
   • If flow logs are not enabled, use the create_flow_logs method to enable them.
   • Specify the desired configuration, such as the destination S3 bucket, IAM role, and log format.
3. Enable AWS Config:
   • Use Boto3 to check if AWS Config is enabled for the AWS account.
   • Create a Python script that checks the status of AWS Config.
   • If AWS Config is not enabled, use the put_configuration_recorder and put_delivery_channel methods to enable it.
   • Specify the desired configuration, such as the S3 bucket for storing configuration history and the IAM role for delivery channel.