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AWS CloudFormation Misconfiguration: Improper EC2 Network Access Control

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Abstract

La plantilla define un grupo de seguridad con restricciones de acceso insuficientes.

Explanation

Las configuraciones de acceso dinámico exponen innecesariamente los sistemas y amplían la superficie de ataque de una organización. Los servicios abiertos a la interacción con el público están sujetos a análisis y sondeos casi continuos por parte de entidades malintencionadas.

Esto es especialmente problemático cuando se descubre y publica una vulnerabilidad de día cero para un servicio expuesto (por ejemplo, Heartbleed). Los atacantes pueden perseguir y buscar activamente sistemas expuestos y sin revisión que puedan aprovechar.


"PSQLSecurityGroup": {
    "Type": "AWS::EC2::SecurityGroup",
    "Properties": {
        "VpcId": {
            "Ref": "VpcId"
        },
        "GroupDescription": "Enable PSQL access via port 5432 to world",
        "SecurityGroupIngress": [
            {
                "CidrIp": "0.0.0.0/0",
                "FromPort": 5432,
                "IpProtocol": "tcp",
                "ToPort": 5432
            }
        ]
    }

References

[1] Amazon Web Services AWS Documentation: AWS::EC2::SecurityGroupIngress

[2] Jesse Lepich and Michael Ingoldby AWS Security Blog: How to continuously audit and limit security groups with AWS Firewall Manager

[3] Jeffrey Lyon AWS Security Blog: How to Help Prepare for DDoS Attacks by Reducing Your Attack Surface

[4] Josh Fruhlinger CSOOnline: The Heartbleed bug: How a flaw in OpenSSL caused a security crisis

[5] Standards Mapping - CIS Amazon Web Services Foundations Benchmark Recommendation 5.2

[6] Standards Mapping - Common Weakness Enumeration CWE ID 749

[7] Standards Mapping - Common Weakness Enumeration Top 25 2020 [18] CWE ID 522

[8] Standards Mapping - Common Weakness Enumeration Top 25 2021 [18] CWE ID 862

[9] Standards Mapping - Common Weakness Enumeration Top 25 2022 [16] CWE ID 862

[10] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-000213, CCI-001084, CCI-002038, CCI-002165

[11] Standards Mapping - General Data Protection Regulation (GDPR) Access Violation

[12] Standards Mapping - NIST Special Publication 800-53 Revision 4 AC-3 Access Enforcement (P1), AC-6 Least Privilege (P1), CM-5 Access Restrictions for Change (P1), IA-11 Re-Authentication (P0), SC-3 Security Function Isolation (P1)

[13] Standards Mapping - NIST Special Publication 800-53 Revision 5 AC-3 Access Enforcement, AC-6 Least Privilege, CM-5 Access Restrictions for Change, SC-3 Security Function Isolation, SC-11 Trusted Path

[14] Standards Mapping - OWASP API 2023 API8 Security Misconfiguration

[15] Standards Mapping - OWASP Application Security Verification Standard 4.0 4.1.3 General Access Control Design (L1 L2 L3)

[16] Standards Mapping - OWASP Top 10 2004 A2 Broken Access Control

[17] Standards Mapping - OWASP Top 10 2007 A4 Insecure Direct Object Reference

[18] Standards Mapping - OWASP Top 10 2010 A4 Insecure Direct Object References

[19] Standards Mapping - OWASP Top 10 2013 A4 Insecure Direct Object References

[20] Standards Mapping - OWASP Top 10 2017 A5 Broken Access Control

[21] Standards Mapping - OWASP Top 10 2021 A01 Broken Access Control

[22] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.2

[23] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.5.4

[24] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.8

[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.8

[26] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.8

[27] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.8

[28] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.8

[29] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4, Requirement 1.4.2

[30] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4, Requirement 1.4.2

[31] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 5.4 - Authentication and Access Control

[32] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 5.4 - Authentication and Access Control

[33] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 5.4 - Authentication and Access Control, Control Objective C.2.3 - Web Software Access Controls

[34] Standards Mapping - SANS Top 25 2009 Porous Defenses - CWE ID 285

[35] Standards Mapping - SANS Top 25 2010 Porous Defenses - CWE ID 863

[36] Standards Mapping - SANS Top 25 2011 Porous Defenses - CWE ID 863

[37] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3480.1 CAT II

[38] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3480.1 CAT I

[39] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3480.1 CAT I

[40] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3480.1 CAT I

[41] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3480.1 CAT I

[42] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3480.1 CAT I

[43] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3480.1 CAT I

[44] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[45] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[46] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[47] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[48] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[49] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[50] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[51] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[52] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[53] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[54] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[55] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[56] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[57] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-001410 CAT II, APSC-DV-001520 CAT II, APSC-DV-002360 CAT II

[58] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-001410 CAT II, APSC-DV-001520 CAT II, APSC-DV-002360 CAT II

[59] Standards Mapping - Web Application Security Consortium Version 2.00 Insufficient Authorization (WASC-02)

[60] Standards Mapping - Web Application Security Consortium 24 + 2 Insufficient Authorization

desc.structural.json.aws_cloudformation_misconfiguration_improper_ec2_network_access_control.base

Abstract

La plantilla define un grupo de seguridad con restricciones de acceso insuficientes.

Explanation


PSQLSecurityGroup:
  Type: 'AWS::EC2::SecurityGroup'
  Properties:
    VpcId: !Ref VpcId
    GroupDescription: Enable PSQL access via port 5432 to world
    SecurityGroupIngress:
      - CidrIp: 0.0.0.0/0
        FromPort: 5432
        IpProtocol: tcp
        ToPort: 5432