📝 AWS RDS Instance uses default endpoint port 🟢

• Contextual name: 📝 Instance uses default endpoint port 🟢
• ID: /ce/ca/aws/rds/instance-default-port
• Located in: 📁 AWS RDS

Flags

• 🟢 Policy with categories
• 🟢 Policy with type
• 🟢 Production policy

Our Metadata

• Policy Type: COMPLIANCE_POLICY
• Policy Category:
  • SECURITY

Similar Policies

• Internal
  • dec-x-fd0bfd1b

Similar Internal Rules

Rule	Policies	Flags
✉️ dec-x-fd0bfd1b	1

Logic

• 🧠 prod.logic.yaml 🟢
  • 📕 AWS RDS Instance
  • 🔌 AWS RDS Instance - object.extracts.yaml
  • 🧪 test-data.json

Description

Open File

Description

Ensure that your Amazon RDS database instances are not using their default endpoint ports (e.g., MySQL/Aurora port 3306, SQL Server port 1433, PostgreSQL port 5432) to enhance security through port obfuscation. Changing the default endpoint ports can add an extra layer of defense against non-targeted attacks.

Rationale

Using default endpoint ports for Amazon RDS database instances can make them more susceptible to automated attacks and scans that target common database ports.

Port obfuscation adds an extra layer of security by making it more difficult for attackers to identify and target your database instances. Non-standard ports are less likely to be targeted by generic scanning and exploitation tools, reducing the overall attack surface of your database environment.

Audit

This policy evaluates the following endpoint port configurations of Amazon RDS database instances:

Database Engine	Default Port
MySQL/Aurora/MariaDB	3306
PostgreSQL/Aurora	5432
Oracle	1521
Microsoft SQL Server	1433

... see more

Remediation

Open File

Remediation

From Command Line

Modify the Endpoint Port

For each incompliant RDS instance, modify the endpoint port to a non-default value. Ensure the new port is within the allowed range and does not conflict with other services.

Run the following command to modify the port of a specific RDS instance:

aws rds modify-db-instance 
--db-instance-identifier {{db-instance-identifier}}
--port {{new-port}} 
--apply-immediately

Replace {{db-instance-identifier}} with the ID of your RDS instance and {{new-port}} with the new port number.

To apply changes immediately rather than in the next maintenance window, use the --apply-immediately parameter when calling the AWS CLI.

Update Security Groups

Ensure that the security groups associated with your RDS instances allow inbound traffic on the new port.

Run the following command to update the security group:

aws ec2 authorize-security-group-ingress 
--group-id {{security-group-id}} 
--protocol tcp 
--port {{new-port}} 
--cidr {{your-cidr-block}}

Replace {{security-group-id}} with the ID of your security group, {{new-port}} with the new port number, and {{your-cidr-block}} with your IP range.

... see more

policy.yaml

Open File

Linked Framework Sections

Section	Sub Sections	Internal Rules	Policies	Flags
💼 AWS Foundational Security Best Practices v1.0.0 → 💼 [RDS.23] RDS instances should not use a database engine default port		1	1
💼 Cloudaware Framework → 💼 Threat Protection			25
💼 FedRAMP High Security Controls → 💼 AC-4 Information Flow Enforcement (M)(H)	2	31	65
💼 FedRAMP High Security Controls → 💼 AC-4(21) Physical or Logical Separation of Information Flows (M)(H)		11	39
💼 FedRAMP High Security Controls → 💼 SC-7 Boundary Protection (L)(M)(H)	10	6	33
💼 FedRAMP High Security Controls → 💼 SC-7(4) External Telecommunications Services (M)(H)			17
💼 FedRAMP High Security Controls → 💼 SC-7(5) Deny by Default — Allow by Exception (M)(H)			19
💼 FedRAMP High Security Controls → 💼 SC-7(21) Isolation of System Components (H)			16
💼 FedRAMP Low Security Controls → 💼 SC-7 Boundary Protection (L)(M)(H)			23
💼 FedRAMP Moderate Security Controls → 💼 AC-4 Information Flow Enforcement (M)(H)	1		51
💼 FedRAMP Moderate Security Controls → 💼 AC-4(21) Physical or Logical Separation of Information Flows (M)(H)			39
💼 FedRAMP Moderate Security Controls → 💼 SC-7 Boundary Protection (L)(M)(H)	7		29
💼 FedRAMP Moderate Security Controls → 💼 SC-7(4) External Telecommunications Services (M)(H)			17
💼 FedRAMP Moderate Security Controls → 💼 SC-7(5) Deny by Default — Allow by Exception (M)(H)			19
💼 NIST CSF v2.0 → 💼 DE.CM-01: Networks and network services are monitored to find potentially adverse events			83
💼 NIST CSF v2.0 → 💼 DE.CM-09: Computing hardware and software, runtime environments, and their data are monitored to find potentially adverse events			89
💼 NIST CSF v2.0 → 💼 ID.AM-03: Representations of the organization's authorized network communication and internal and external network data flows are maintained			31
💼 NIST CSF v2.0 → 💼 PR.DS-01: The confidentiality, integrity, and availability of data-at-rest are protected			82
💼 NIST CSF v2.0 → 💼 PR.DS-02: The confidentiality, integrity, and availability of data-in-transit are protected			69
💼 NIST CSF v2.0 → 💼 PR.DS-10: The confidentiality, integrity, and availability of data-in-use are protected			67
💼 NIST CSF v2.0 → 💼 PR.IR-01: Networks and environments are protected from unauthorized logical access and usage			40
💼 NIST SP 800-53 Revision 5 → 💼 AC-4 Information Flow Enforcement	32	61	73
💼 NIST SP 800-53 Revision 5 → 💼 AC-4(21) Information Flow Enforcement _ Physical or Logical Separation of Information Flows		35	39
💼 NIST SP 800-53 Revision 5 → 💼 SC-7 Boundary Protection	29	5	33
💼 NIST SP 800-53 Revision 5 → 💼 SC-7(4) Boundary Protection _ External Telecommunications Services			17
💼 NIST SP 800-53 Revision 5 → 💼 SC-7(5) Boundary Protection _ Deny by Default — Allow by Exception		5	19
💼 NIST SP 800-53 Revision 5 → 💼 SC-7(11) Boundary Protection _ Restrict Incoming Communications Traffic			15
💼 NIST SP 800-53 Revision 5 → 💼 SC-7(16) Boundary Protection _ Prevent Discovery of System Components			16
💼 NIST SP 800-53 Revision 5 → 💼 SC-7(21) Boundary Protection _ Isolation of System Components			16