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.

Predicate Injection

Objective-C
Swift

Abstract

Si se elabora un NSPredicate dinámico con una entrada de un origen que no es de confianza, un usuario malintencionado podría modificar el significado de la instrucción.

Explanation

Las instancias de NSPredicate especifican cómo debe obtenerse o filtrarse una colección de orígenes como CoreData del sistema de almacenamiento complejo, una matriz y un diccionario. El lenguaje de consulta proporciona un lenguaje expresivo similar a SQL para definir condiciones lógicas en las que se debe buscar la colección.

Un atacante que puede influir en el predicado también puede ser capaz de modificar su significado para, por ejemplo, filtrar datos, eludir controles de seguridad o suplantar a otros usuarios.

Ejemplo 1: En el ejemplo siguiente se muestra cómo se utiliza un NSPredicate como factor de autenticación para acceder a algunos datos almacenados por la aplicación. Dado que los usuarios pueden proporcionar valores PIN arbitrarios, podrán utilizar un carácter comodín (*) para eludir la protección PIN.


NSString *pin = [self getPinFromUser];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"pin LIKE %@", pin];

References

[1] Swift Core Data Format String Injection nVisium

[2] David Thiel iOS Application Security: The Definitive Guide for Hackers and Developers No Starch Press

[3] Standards Mapping - Common Weakness Enumeration CWE ID 566

[4] Standards Mapping - Common Weakness Enumeration Top 25 2023 [24] CWE ID 863

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

[6] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-000213, CCI-001084, CCI-001310, CCI-002165

[7] Standards Mapping - FIPS200 AC

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

[9] Standards Mapping - NIST Special Publication 800-53 Revision 4 AC-3 Access Enforcement (P1), SC-3 Security Function Isolation (P1), SI-10 Information Input Validation (P1)

[10] Standards Mapping - NIST Special Publication 800-53 Revision 5 AC-3 Access Enforcement, SC-3 Security Function Isolation, SI-10 Information Input Validation

[11] Standards Mapping - OWASP Application Security Verification Standard 4.0 4.1.2 General Access Control Design (L1 L2 L3), 4.1.3 General Access Control Design (L1 L2 L3), 4.1.5 General Access Control Design (L1 L2 L3), 4.2.1 Operation Level Access Control (L1 L2 L3)

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

[13] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation

[14] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-AUTH-1, MASVS-CODE-4

[15] Standards Mapping - OWASP Top 10 2004 A2 Broken Access Control

[16] Standards Mapping - OWASP Top 10 2007 A4 Insecure Direct Object Reference

[17] Standards Mapping - OWASP Top 10 2010 A4 Insecure Direct Object References

[18] Standards Mapping - OWASP Top 10 2013 A4 Insecure Direct Object References

[19] Standards Mapping - OWASP Top 10 2017 A5 Broken Access Control

[20] Standards Mapping - OWASP Top 10 2021 A03 Injection

[21] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.2

[22] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.5.4

[23] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.8

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

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

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

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

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

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

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

[31] 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

[32] 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

[33] Standards Mapping - SANS Top 25 2011 Porous Defenses - CWE ID 863

[34] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3480.1 CAT II

[35] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3480.1 CAT I

[36] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3480.1 CAT I

[37] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3480.1 CAT I

[38] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3480.1 CAT I

[39] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3480.1 CAT I

[40] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3480.1 CAT I

[41] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[42] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[43] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[44] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[45] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[46] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[47] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[48] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[49] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[50] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[51] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[52] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[53] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II

[54] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II, APSC-DV-002530 CAT II

[55] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-002360 CAT II, APSC-DV-002530 CAT II

[56] Standards Mapping - Web Application Security Consortium Version 2.00 Insufficient Authorization (WASC-02)

[57] Standards Mapping - Web Application Security Consortium 24 + 2 Insufficient Authorization

desc.dataflow.objc.predicate_injection

Abstract

Si se elabora un NSPredicate dinámico con una entrada de un origen que no es de confianza, un usuario malintencionado podría modificar el significado de la instrucción.

Explanation


let pin = getPinFromUser();
let predicate = NSPredicate(format: "pin LIKE '\(pin)'", argumentArray: nil)