界: Encapsulation

封装即绘制强边界。在 Web 浏览器中，这可能意味着确保您的移动代码不会被其他移动代码滥用。在服务器上，这可能意味着区分已验证数据和未验证数据、区分一个用户的数据和另一个用户的数据，或者区分允许用户查看的数据和不允许用户查看的数据。

Flash Misconfiguration: Policy Restrictions Bypass

Abstract
程序利用未经验证的用户输入避开预期的跨域策略限制。
Explanation
默认情况下，Flash 应用程序需要遵循 Same Origin Policy（同源策略），该策略可确保来自同一个域的两个 SWF 应用程序能够访问彼此的数据。Adobe Flash 允许开发人员通过编程或 crossdomain.xml 配置文件中的相应设置来更改该策略。不过，在确定可更改此设置的人时应小心谨慎，如果跨域策略过于宽松，恶意应用程序就能趁机采用不当方式与受害者应用程序进行通信，从而导致发生欺骗、数据被盗、转发及其他攻击。在以下情况下会发生策略限制绕过漏洞：

1. 数据从一个不可信赖的数据源进入应用程序。

2. 数据用于加载或修改跨域策略设置。
示例 1：以下代码会将已加载的 SWF 文件中的一个参数值作为用于加载跨域策略文件的 URL。


   ...
   var params:Object = LoaderInfo(this.root.loaderInfo).parameters;
   var url:String = String(params["url"]);
   flash.system.Security.loadPolicyFile(url);
   ...
示例 2：以下代码会使用已加载的 SWF 文件中的一个参数值来定义可信赖的域列表。


   ...
   var params:Object = LoaderInfo(this.root.loaderInfo).parameters;
   var domain:String = String(params["domain"]);
   flash.system.Security.allowDomain(domain);
   ...
References
[1] Peleus Uhley Creating more secure SWF web applications
[2] Matt Wood and Prajakta Jagdale Auditing Adobe Flash through Static Analysis
[3] Standards Mapping - CIS Azure Kubernetes Service Benchmark 2
[4] Standards Mapping - CIS Microsoft Azure Foundations Benchmark partial
[5] Standards Mapping - CIS Amazon Elastic Kubernetes Service Benchmark 5
[6] Standards Mapping - CIS Amazon Web Services Foundations Benchmark 1
[7] Standards Mapping - CIS Google Kubernetes Engine Benchmark integrity
[8] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001368, CCI-001414
[9] Standards Mapping - General Data Protection Regulation (GDPR) Access Violation
[10] Standards Mapping - NIST Special Publication 800-53 Revision 4 AC-4 Information Flow Enforcement (P1)
[11] Standards Mapping - NIST Special Publication 800-53 Revision 5 AC-4 Information Flow Enforcement
[12] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[13] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration
[14] Standards Mapping - OWASP Mobile 2014 M5 Poor Authorization and Authentication
[15] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.10
[16] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.8
[17] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.8
[18] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.8
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.8
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[21] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 5.4 - Authentication and Access Control
[22] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 5.4 - Authentication and Access Control
[23] 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
[24] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II
[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 5.1 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II
[36] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II
[37] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II
[38] Standards Mapping - Web Application Security Consortium Version 2.00 Improper Input Handling (WASC-20)
desc.dataflow.actionscript.flash_misconfiguration_policy_restrictions_bypass