Reino: Input Validation and Representation

Los problemas de validación y representación de entradas están causados por metacaracteres, codificaciones alternativas y representaciones numéricas. Los problemas de seguridad surgen de entradas en las que se confía. Estos problemas incluyen: «desbordamientos de búfer», ataques de «scripts de sitios», "SQL injection" y muchas otras acciones.

Cross-Site Scripting: External Links

Java/JSP

Abstract

El envío de datos no validados a un explorador web puede dar lugar a que este ejecute código malintencionado. Los ajustes de la configuración pueden minimizar y reducir la exposición a Cross-Site Scripting.

Explanation

Las vulnerabilidades Cross-Site Scripting (XSS) se producen cuando:

1. Los datos entran en una aplicación web a través de un origen que no es de confianza, normalmente una solicitud web o una base de datos.

2. Los datos se incluyen en el contenido dinámico que se envía a un usuario web sin validación.

El contenido malintencionado que se envía al explorador web a menudo adopta la forma de un segmento de código JavaScript, pero también se puede presentar como HTML, Flash o cualquier otro tipo de código que el explorador ejecute. La variedad de los ataques basados en XSS es casi ilimitada, pero suelen incluir la transmisión al atacante de datos privados, como cookies u otra información de sesión, el redireccionamiento de la víctima a contenido web que el atacante controla u otras operaciones malintencionadas en el equipo del usuario bajo el disfraz de un sitio vulnerable.

Dado que los ataques contra las vulnerabilidades XSS suelen implicar la comunicación con un sitio malintencionado controlado por el atacante o la redirección a este, la capacidad de inyectar referencias a contenidos en otros dominios forma parte de muchas vulnerabilidades de seguridad. AntiSamy se puede configurar para evitar vínculos a dominios externos, lo que disminuye el daño que un atacante puede ocasionar mediante un ataque XSS. Sin embargo, esta protección es solo una solución parcial y no aborda la amenaza general que plantean las vulnerabilidades XSS.

Ejemplo 1: La siguiente entrada de configuración de AntiSamy permite vínculos a direcciones URL fuera del dominio en el que se ejecuta la aplicación.


		<attribute name="href" onInvalid="filterTag">
			<regexp-list>
				<regexp name="onsiteURL"/>
				<regexp name="offsiteURL"/>
			</regexp-list>
		</attribute>

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 82, CWE ID 83, CWE ID 87, CWE ID 692

[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-001167, CCI-001310

[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 SC-18 Mobile Code (P2), SI-10 Information Input Validation (P1)

[14] Standards Mapping - NIST Special Publication 800-53 Revision 5 SC-18 Mobile Code, 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 116

[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-003300 CAT II

[47] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002490 CAT I, APSC-DV-003300 CAT II

[48] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002490 CAT I, APSC-DV-003300 CAT II

[49] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002490 CAT I, APSC-DV-003300 CAT II

[50] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002490 CAT I, APSC-DV-003300 CAT II

[51] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002490 CAT I, APSC-DV-003300 CAT II

[52] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002490 CAT I, APSC-DV-003300 CAT II

[53] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002490 CAT I, APSC-DV-003300 CAT II

[54] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002490 CAT I, APSC-DV-003300 CAT II

[55] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002490 CAT I, APSC-DV-003300 CAT II

[56] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002490 CAT I, APSC-DV-003300 CAT II

[57] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002490 CAT I, APSC-DV-003300 CAT II

[58] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002490 CAT I, APSC-DV-003300 CAT II

[59] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002490 CAT I, APSC-DV-002530 CAT II, APSC-DV-003300 CAT II

[60] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002490 CAT I, APSC-DV-002530 CAT II, APSC-DV-003300 CAT II

[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.config.java.xss_external_links