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.

HTML5: Deprecated Content Security Policy

Universal

Abstract

Using deprecated Content Security Policy headers can cause unexpected behaviour in web browswers.

Explanation

Content Security Policy (CSP) is an HTTP response security header that developers can leverage to specify external domains from which the site is allowed to load resources such as images and JavaScript files. This header provides in-depth security protection from critical vulnerabilities such as cross-site scripting (XSS) and clickjacking. Before Content-Security-Policy was standardized under the current header, two different experimental equivalents of this header existed: X-Content-Security-Policy and X-WebKit-CSP. The X-Content-Security-Policy was implemented and maintained in Firefox until version 23 and in Internet Explorer until version 10, and was implemented as X-Webkit-CSP in Chrome until version 25. Some browsers might still accept the header, but modern browsers no longer maintain, support, or enhance implementation of these two experimental versions.

References

[1] Content Security Policy Level 3

[2] Content Security Policy

[3] MDN web docs

[4] Content Security Policy (CSP) Quick Reference Guide

[5] Standards Mapping - Common Weakness Enumeration CWE ID 477

[6] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001368, CCI-001414

[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data

[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 AC-4 Information Flow Enforcement (P1)

[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 AC-4 Information Flow Enforcement

[10] Standards Mapping - OWASP Application Security Verification Standard 4.0 1.14.6 Configuration Architectural Requirements (L2 L3)

[11] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls

[12] Standards Mapping - OWASP Mobile 2024 M8 Security Misconfiguration

[13] Standards Mapping - OWASP Top 10 2010 A6 Security Misconfiguration

[14] Standards Mapping - OWASP Top 10 2013 A5 Security Misconfiguration

[15] Standards Mapping - OWASP Top 10 2017 A6 Security Misconfiguration

[16] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration

[17] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.10

[18] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.6

[19] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.6

[20] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.6

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

[22] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection

[23] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection

[24] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection

[25] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II

[26] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II

[27] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II

[28] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II

[29] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II

[30] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II

[31] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II

[32] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II

[33] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II

[34] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II

[35] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II

[36] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II

[37] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II

[38] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II

[39] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II

[40] Standards Mapping - Web Application Security Consortium Version 2.00 Application Misconfiguration (WASC-15)

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