Control: 6.2.1 Ensure no VPC access control lists allow ingress from 0.0.0.0/0 to port 22

Description

VPC access control lists filter all incoming and outgoing traffic in IBM Cloud VPC. An ACL is a built-in, virtual firewall where ACL rules control traffic to and from the subnets, rather than to and from the virtual servers. It is recommended that no ACL allows unrestricted ingress access to port 22.

Remediation

From Console

Login to the IBM Cloud Portal.
At the Menu icon, select VPC Infrastructure-->Access Control Lists.
For each security group, perform the following: a. Select the access control list name. b. Identify the Inbound rule to be removed. c. Using the Options icon, select Delete.

Usage

Run the control in your terminal:

powerpipe control run ibm_compliance.control.cis_v100_6_2_1

Snapshot and share results via Turbot Pipes:

powerpipe login
powerpipe control run ibm_compliance.control.cis_v100_6_2_1 --share

SQL

This control uses a named query:

with ingress_ssh_rules as (
  select
    crn,
    count(id) as num_ssh_rules
  from
    ibm_is_network_acl,
    jsonb_array_elements(rules) as rule
  where
    rule ->> 'direction' = 'inbound'
    and rule ->> 'source' = '0.0.0.0/0'
    and rule ->> 'action' = 'allow'
    and (
      rule ->> 'protocol' = 'all'
      or (
        (rule ->> 'source_port_min') :: integer <= 22
        and (rule ->> 'source_port_max') :: integer >= 22
      )
    )
  group by crn
)
select
  acl.crn as resource,
  case
    when r.crn is null then 'ok'
    else 'alarm'
  end as status,
  case
    when r.crn is null then acl.title || ' ingress restricted for SSH from 0.0.0.0/0.'
    else acl.title || ' contains ' || r.num_ssh_rules || ' ingress rule(s) allowing SSH from 0.0.0.0/0.'
  end as reason,
  acl.region,
  acl.account_id
from
  ibm_is_network_acl as acl
  left join ingress_ssh_rules as r on r.crn = acl.crn;

Control: 6.2.1 Ensure no VPC access control lists allow ingress from 0.0.0.0/0 to port 22

Description

Remediation

From Console

Usage

SQL

Tags