界: Input Validation and Representation
输入验证与表示问题是由元字符、交替编码和数字表示引起的。安全问题源于信任输入。这些问题包括：“Buffer Overflows”、“Cross-Site Scripting”攻击、“SQL Injection”等其他问题。
Cross-Site Scripting: Handlebars Helper
Abstract
向一个 Web 浏览器发送未经验证的数据会导致该浏览器执行恶意代码。
Explanation
Cross-Site Scripting (XSS) 漏洞会在以下情况下发生：
1.数据通过一个不可信赖的数据源进入 Web 应用程序。使用 Handlebars，您可以创建可用于修改模板的自定义帮助程序。
2.数据包含在插入到模板的动态内容中，然后未经验证呈现。对于 Handlebars 帮助程序，恶意内容作为模板的输出呈现。
对于 Handlebars 帮助程序，恶意内容采用 JavaScript 代码片段的形式，或者其他任意一种可以被浏览器执行的代码的形式。由于 Handlebars 模板的输出通常是要传递给浏览器的 HTML 内容，因此任何潜在的恶意内容都应被视为不安全并经过验证。
示例 1：考虑使用以下 Handlebars 帮助程序代码：
1.数据通过一个不可信赖的数据源进入 Web 应用程序。使用 Handlebars，您可以创建可用于修改模板的自定义帮助程序。
2.数据包含在插入到模板的动态内容中，然后未经验证呈现。对于 Handlebars 帮助程序，恶意内容作为模板的输出呈现。
对于 Handlebars 帮助程序，恶意内容采用 JavaScript 代码片段的形式，或者其他任意一种可以被浏览器执行的代码的形式。由于 Handlebars 模板的输出通常是要传递给浏览器的 HTML 内容，因此任何潜在的恶意内容都应被视为不安全并经过验证。
示例 1：考虑使用以下 Handlebars 帮助程序代码：
Handlebars.registerHelper('bolden', function (aString) {
return new Handlebars.SafeString("" + aString + "")
})
// ...
let template = Handlebars.compile('{{bolden someArgument}}')
myElem.innerHTML = template({someArgument: userInput})
bolden 帮助程序传递用户控制的数据 userInput。虽然使用双花括号（{{ 和 }}）通常意味着输出内容是 HTML 编码的，但在此情况下，bolden 帮助程序通过将输入传递给 new Handlebars.SafeString() 来覆盖任何验证，从而导致输入呈现为常规 HTML。当 HTML 从 template() 返回时，将被传递给 innerHTML 属性，从而导致基于 DOM 的 XSS 攻击。References
[1] Understanding Malicious Content Mitigation for Web Developers CERT
[2] HTML 4.01 Specification W3
[3] Standards Mapping - Common Weakness Enumeration CWE ID 79, CWE ID 80
[4] Standards Mapping - Common Weakness Enumeration Top 25 2019 [2] CWE ID 079
[5] Standards Mapping - Common Weakness Enumeration Top 25 2020 [1] CWE ID 079
[6] Standards Mapping - Common Weakness Enumeration Top 25 2021 [2] CWE ID 079
[7] Standards Mapping - Common Weakness Enumeration Top 25 2022 [2] CWE ID 079
[8] Standards Mapping - Common Weakness Enumeration Top 25 2023 [2] CWE ID 079
[9] Standards Mapping - Common Weakness Enumeration Top 25 2024 [1] CWE ID 079
[10] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001310, CCI-002754
[11] Standards Mapping - FIPS200 SI
[12] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[13] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[14] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[15] Standards Mapping - OWASP Application Security Verification Standard 4.0 5.3.3 Output Encoding and Injection Prevention Requirements (L1 L2 L3), 5.3.6 Output Encoding and Injection Prevention Requirements (L1 L2 L3)
[16] Standards Mapping - OWASP Mobile 2014 M7 Client Side Injection
[17] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[18] Standards Mapping - OWASP Top 10 2004 A4 Cross Site Scripting
[19] Standards Mapping - OWASP Top 10 2007 A1 Cross Site Scripting (XSS)
[20] Standards Mapping - OWASP Top 10 2010 A2 Cross-Site Scripting (XSS)
[21] Standards Mapping - OWASP Top 10 2013 A3 Cross-Site Scripting (XSS)
[22] Standards Mapping - OWASP Top 10 2017 A7 Cross-Site Scripting (XSS)
[23] Standards Mapping - OWASP Top 10 2021 A03 Injection
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.4
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.7
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.7
[28] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.7
[29] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.7
[30] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.7
[31] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[32] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[33] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[34] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[35] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[36] Standards Mapping - SANS Top 25 2009 Insecure Interaction - CWE ID 079
[37] Standards Mapping - SANS Top 25 2010 Insecure Interaction - CWE ID 079
[38] Standards Mapping - SANS Top 25 2011 Insecure Interaction - CWE ID 079
[39] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I, APP3580 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I, APP3580 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I, APP3580 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I, APP3580 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I, APP3580 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I, APP3580 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I, APP3580 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002490 CAT I, APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002490 CAT I, APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002490 CAT I, APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002490 CAT I, APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002490 CAT I, APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002490 CAT I, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002490 CAT I, APSC-DV-002560 CAT I
[53] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002490 CAT I, APSC-DV-002560 CAT I
[54] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002490 CAT I, APSC-DV-002560 CAT I
[55] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002490 CAT I, APSC-DV-002560 CAT I
[56] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002490 CAT I, APSC-DV-002560 CAT I
[57] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002490 CAT I, APSC-DV-002560 CAT I
[58] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002490 CAT I, APSC-DV-002560 CAT I
[59] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002490 CAT I, APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[60] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002490 CAT I, APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[61] Standards Mapping - Web Application Security Consortium Version 2.00 Cross-Site Scripting (WASC-08)
[62] Standards Mapping - Web Application Security Consortium 24 + 2 Cross-Site Scripting
desc.dataflow.javascript.cross_site_scripting_handlebars_helper