Azure Terraform Misconfiguration: Improper Storage CORS Policy

Abstract

配置设置了过于宽松的 CORS 策略。

Explanation

跨域资源共享 (CORS) 是一种允许域为其资源定义策略，以供托管在不同域上的网页访问的技术。在过去，Web 浏览器始终限制从其他域加载的脚本访问其域资源，以遵守同源策略。
CORS 为域提供了一种将其他域列入安全列表并允许它们访问其资源的方法。

定义 CORS 策略时应小心谨慎，因为在服务器级别为域或域上的目录配置的过于宽松的策略可能会在跨域访问时暴露超过预期的更多内容。CORS 可使恶意应用程序与受害者应用程序进行错误通信，从而导致发生信息泄露、欺骗、数据被盗、转发或其他攻击。

实施 CORS 会增加应用程序的攻击面，只应在必要时使用。

References

[1] W3C Cross-Origin Resource Sharing

[2] Michael Schmidt HTML5 Web Security

[3] Philippe De Ryck, Lieven Desmet, Pieter Philippaerts, and Frank Piessens A Security Analysis of Next Generation Web Standards

[4] James Kettle Exploiting CORS misconfigurations for Bitcoins and bounties

[5] Standards Mapping - Common Weakness Enumeration CWE ID 942

[6] Standards Mapping - Common Weakness Enumeration Top 25 2024 [18] CWE ID 863

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

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

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

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

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

[12] Standards Mapping - OWASP Application Security Verification Standard 4.0 14.4.6 HTTP Security Headers Requirements (L1 L2 L3), 14.5.3 Validate HTTP Request Header Requirements (L1 L2 L3)

[13] Standards Mapping - OWASP Mobile 2014 M5 Poor Authorization and Authentication

[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 2.0 Requirement 6.5.8

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

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

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

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

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

[24] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4

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

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

[27] 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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