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How to Find AWS EC2 security_group with Security group is configured wide open

Problem

If Security groups are not properly configured the attack surface is increased.

info

This security check is part of the CIS Amazon Web Services Benchmarks and is rated severity high.

Prerequisites

This guide assumes that you have already installed and configured Resoto to collect your AWS cloud resources.

Directions

  1. Execute the following search command in Resoto Shell or Resoto UI:

    > search is(aws_ec2_security_group) and group_ip_permissions[*].ip_ranges[*].{cidr_ip!="0.0.0.0/0" and cidr_ip!~"^192" and cidr_ip!~"^10" and cidr_ip~"\/(([1-9])|(1[0-9])|(2[0-3]))$"}
    ​kind=aws_ec2_security_group, ..., region=resoto-poweruser
    ​kind=aws_ec2_security_group, ..., account=poweruser-team
  2. Pipe the search command into the dump command:

    > search is(aws_ec2_security_group) and group_ip_permissions[*].ip_ranges[*].{cidr_ip!="0.0.0.0/0" and cidr_ip!~"^192" and cidr_ip!~"^10" and cidr_ip~"\/(([1-9])|(1[0-9])|(2[0-3]))$"} | dump
    ​reported:
    ​ id: /aws/ec2/123
    ​ name: some-name
    ​ ctime: '2022-12-05T22:53:14Z'
    ​ kind: aws_ec2_security_group
    ​ age: 2mo28d

    The command output will list the details of all non-compliant aws_ec2_security_group resources.

  3. Fix detected issues by following the remediation steps:

    • Apply Zero Trust approach.
    • Implement a process to scan and remediate unrestricted or overly permissive network acls.
    • Recommended best practices is to narrow the definition for the minimum ports required.
    note

    Please refer to the AWS EC2 documentation for details.

Further Reading