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Ensure unencrypted LDAP port (389) is not exposed to the internet

### Overview

Category

Controls

Medium

Applies to

AWS

Coverage

1 queries

Asset types

1 covered

Overview

Overview

Services and databases store data that may be sensitive, protected by law, subject to regulatory requirements or compliance standards. It is highly recommended that access to data will be restricted to encrypted protocols. This rule detects network settings that may expose data via unencrypted protocol over the public internet or to a too wide local scope.

Remediation guidance

Either remove the unencrypted LDAP port (389) from the security group or allow access to it only to certain resources such as certain CIDR ranges or other security groups. For precise steps, consult the AWS documentation

Service-wide remediation

Recommended when many resources are affected: fix the platform baseline first so new resources inherit the secure setting, then remediate the existing flagged resources in batches.

AWS

Use AWS Organizations guardrails, AWS Config rules or conformance packs where they fit, approved account baselines, and IaC modules so new resources inherit the secure setting.

Operational rollout

  1. Fix the baseline first at the account, subscription, project, cluster, or tenant scope that owns this control.
  2. Remediate the currently affected resources in batches, starting with internet-exposed and production assets.
  3. Re-scan and track approved exceptions with an owner and expiry date.

Query logic

These are the stored checks tied to this control.

Unencrypted LDAP port (389) is not exposed to the internet

Connectors

AWS

Covered asset types

SecurityGroup

Expected check: eq []

{securityGroups(where: {rules_SOME: {direction: "Inbound", destFromPort_LTE: 389, destToPort_GTE: 389, OR: [{sources_INCLUDES: "cidr:0.0.0.0/0"}, {sources_INCLUDES: "cidr:::/0"}]}}) {...AssetFragment}}
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