Kingdom: Encapsulation

Encapsulation is about drawing strong boundaries. In a web browser that might mean ensuring that your mobile code cannot be abused by other mobile code. On the server it might mean differentiation between validated data and unvalidated data, between one user's data and another's, or between data users are allowed to see and data that they are not.

AWS CloudFormation Misconfiguration: Improper Lambda Access Control Policy

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Abstract

The template defines a wildcard lambda principal.

Explanation

A wildcard configuration for lambda principals violates the least privilege principle and allows an attacker to invoke the lambda from any account.

Example 1: The following example template defines a wildcard lambda principal.


{
    "Resources": {
        "LambdaPerm": {
            "Type": "AWS::Lambda::Permission",
            "Properties": {
            "SourceAccount": "AWS::AccountId",
            "SourceArn": "bucket.Arn",
            "FunctionName": "function.Arn",
            "Action": "lambda:InvokeFunction",
            "Principal": "*"
            }
        }
    },
    "AWSTemplateFormatVersion": "2010-09-09",
    "Description": "Lambda Permission"
}

References

[1] Amazon Web Services Security in AWS Lambda

[2] Amazon Web Services AWS Documentation: AWS::Lambda::Permission

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

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

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

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

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

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

[9] Standards Mapping - NIST Special Publication 800-53 Revision 4 AC-6 Least Privilege (P1)

[10] Standards Mapping - NIST Special Publication 800-53 Revision 5 AC-6 Least Privilege

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4

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

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

[29] 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

desc.structural.json.aws_cloudformation_misconfiguration_improper_lambda_access_control_policy.base

Abstract

The template defines a wildcard lambda principal.

Explanation


AWSTemplateFormatVersion: "2010-09-09"
Description: Lambda Permission
Resources:
  LambdaPerm:
  Type: AWS::Lambda::Permission
  Properties:
    FunctionName: !GetAtt function.Arn
    Action: lambda:InvokeFunction
    Principal: "*"
    SourceAccount: !Ref "AWS::AccountId"
    SourceArn: !GetAtt bucket.Arn