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.

NoSQL Injection: Realm

Objective-C
Swift

Abstract

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

Explanation

Las deficiencias NoSQL Injection en Realm se producen cuando:

1. Los datos entran en un programa desde un origen que no es de confianza.

2. Los datos se utilizan para crear dinámicamente una consulta Realm.

Ejemplo 1: El código siguiente crea y ejecuta dinámicamente una consulta Realm que busca correos electrónicos con un ID específico.


...
    NSString *emailId = [self getEmailIdFromUser];
    NSString *query = [NSString stringWithFormat:@"id == '%@'", emailId];
    RLMResults<Email *> *emails = [Email objectsInRealm:realm where:query];
...

La consulta intenta ejecutar el código siguiente:


    id == '<emailId value>'

Sin embargo, dado que la consulta se crea dinámicamente mediante la concatenación de una cadena de consulta de base constante y una cadena de entrada del usuario, solo funciona correctamente si emailId no contiene un carácter de comilla simple. Si un usuario malintencionado introduce la cadena 123' or '4' != '5 para emailId, entonces la consulta será de la siguiente forma:


    id == '123' or '4' != '5'

Al añadir la condición or '4' != '5', la cláusula where siempre se evalúa como true, lo que podría hacer que la consulta devuelva todas las entradas almacenadas en la colección emails, sin importar el propietario del correo electrónico.

References

[1] Standards Mapping - Common Weakness Enumeration CWE ID 89, CWE ID 943

[2] Standards Mapping - Common Weakness Enumeration Top 25 2019 [6] CWE ID 089

[3] Standards Mapping - Common Weakness Enumeration Top 25 2020 [6] CWE ID 089

[4] Standards Mapping - Common Weakness Enumeration Top 25 2021 [6] CWE ID 089

[5] Standards Mapping - Common Weakness Enumeration Top 25 2022 [3] CWE ID 089

[6] Standards Mapping - Common Weakness Enumeration Top 25 2023 [3] CWE ID 089

[7] Standards Mapping - Common Weakness Enumeration Top 25 2024 [3] CWE ID 089

[8] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001310, CCI-002754

[9] Standards Mapping - FIPS200 SI

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

[11] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)

[12] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation

[13] Standards Mapping - OWASP Application Security Verification Standard 4.0 5.3.4 Output Encoding and Injection Prevention Requirements (L1 L2 L3), 5.3.5 Output Encoding and Injection Prevention Requirements (L1 L2 L3)

[14] Standards Mapping - OWASP Mobile 2014 M7 Client Side Injection

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

[16] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4

[17] Standards Mapping - OWASP Top 10 2004 A6 Injection Flaws

[18] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws

[19] Standards Mapping - OWASP Top 10 2010 A1 Injection

[20] Standards Mapping - OWASP Top 10 2013 A1 Injection

[21] Standards Mapping - OWASP Top 10 2017 A1 Injection

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

[23] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.6

[24] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2

[25] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1

[26] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1

[27] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1

[28] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1

[29] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1

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

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

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

[33] 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

[34] 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

[35] Standards Mapping - SANS Top 25 2009 Insecure Interaction - CWE ID 089

[36] Standards Mapping - SANS Top 25 2010 Insecure Interaction - CWE ID 089

[37] Standards Mapping - SANS Top 25 2011 Insecure Interaction - CWE ID 089

[38] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I, APP3540.1 CAT I, APP3540.3 CAT II

[39] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I, APP3540.1 CAT I, APP3540.3 CAT II

[40] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I, APP3540.1 CAT I, APP3540.3 CAT II

[41] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I, APP3540.1 CAT I, APP3540.3 CAT II

[42] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I, APP3540.1 CAT I, APP3540.3 CAT II

[43] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I, APP3540.1 CAT I, APP3540.3 CAT II

[44] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I, APP3540.1 CAT I, APP3540.3 CAT II

[45] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002540 CAT I, APSC-DV-002560 CAT I

[46] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002540 CAT I, APSC-DV-002560 CAT I

[47] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002540 CAT I, APSC-DV-002560 CAT I

[48] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002540 CAT I, APSC-DV-002560 CAT I

[49] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002540 CAT I, APSC-DV-002560 CAT I

[50] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002540 CAT I, APSC-DV-002560 CAT I

[51] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002540 CAT I, APSC-DV-002560 CAT I

[52] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002540 CAT I, APSC-DV-002560 CAT I

[53] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002540 CAT I, APSC-DV-002560 CAT I

[54] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002540 CAT I, APSC-DV-002560 CAT I

[55] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002540 CAT I, APSC-DV-002560 CAT I

[56] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002540 CAT I, APSC-DV-002560 CAT I

[57] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002540 CAT I, APSC-DV-002560 CAT I

[58] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002540 CAT I, APSC-DV-002560 CAT I

[59] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002540 CAT I, APSC-DV-002560 CAT I

[60] Standards Mapping - Web Application Security Consortium Version 2.00 SQL Injection (WASC-19)

[61] Standards Mapping - Web Application Security Consortium 24 + 2 SQL Injection

desc.dataflow.objc.nosql_injection_realm

Abstract

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

Explanation


...
    let emailId = getFromUser("emailId")
    let email = realm.objects(Email.self).filter("id == '" + emailId + "'")
...

La consulta intenta ejecutar el código siguiente:


    id == '<emailId value>'


    id == '123' or '4' != '5'

Al añadir la condición or '4' != '5', la cláusula filter siempre se evalúa como true, lo que podría hacer que la consulta devuelva todas las entradas almacenadas en la colección emails, sin importar el propietario del correo electrónico.