Reino: Encapsulation

Encapsulamento consiste em traçar limites fortes. Em um navegador web, isso pode significar que seu código para dispositivos móveis não pode ser abusado por outros códigos para dispositivos móveis. No servidor, pode significar a diferenciação entre dados validados e não validados, entre os dados de dois usuários ou entre os dados que os usuários podem ou não acessar.

Insecure IPC: Missing Content Validation

Objective-C
Swift

Abstract

O controlador de exibição de extensão não consegue validar os dados enviados do aplicativo host.

Explanation

A extensão recebe dados do aplicativo host no controlador de exibição e não pode implementar SLComposeServiceViewController isContentValid para validar os dados não confiáveis recebidos antes de usá-los.

Exemplo 1: O seguinte controlador de exibição da extensão recebe dados do aplicativo host, mas não pode implementar um método de chamada para validá-lo:


    #import <MobileCoreServices/MobileCoreServices.h>

    @interface ShareViewController : SLComposeServiceViewController
        ...
    @end

    @interface ShareViewController ()
        ...
    @end

    @implementation ShareViewController

    - (void)didSelectPost {
        NSExtensionItem *item = self.extensionContext.inputItems.firstObject;
        NSItemProvider *itemProvider = item.attachments.firstObject;
        ...
        // Use the received items
        ...
        [self.extensionContext completeRequestReturningItems:@[] completionHandler:nil];
    }

    ...

    @end

References

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

[2] SLComposeServiceViewController Apple

[3] Standards Mapping - Common Weakness Enumeration CWE ID 501

[4] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001084, CCI-002754

[5] Standards Mapping - FIPS200 SI

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

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

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

[9] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs

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

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

[12] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input

[13] Standards Mapping - OWASP Top 10 2021 A04 Insecure Design

[14] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1

[15] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1

[16] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I

[17] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I

[18] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I

[19] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I

[20] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I

[21] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I

[22] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I

[23] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002360 CAT II, APSC-DV-002560 CAT I

[24] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002360 CAT II, APSC-DV-002560 CAT I

[25] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002360 CAT II, APSC-DV-002560 CAT I

[26] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002360 CAT II, APSC-DV-002560 CAT I

[27] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002360 CAT II, APSC-DV-002560 CAT I

[28] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002360 CAT II, APSC-DV-002560 CAT I

[29] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002360 CAT II, APSC-DV-002560 CAT I

[30] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002360 CAT II, APSC-DV-002560 CAT I

[31] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002360 CAT II, APSC-DV-002560 CAT I

[32] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002360 CAT II, APSC-DV-002560 CAT I

[33] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002360 CAT II, APSC-DV-002560 CAT I

[34] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002360 CAT II, APSC-DV-002560 CAT I

[35] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002360 CAT II, APSC-DV-002560 CAT I

[36] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002360 CAT II, APSC-DV-002560 CAT I

[37] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002360 CAT II, APSC-DV-002560 CAT I

[38] Standards Mapping - Web Application Security Consortium Version 2.00 Improper Input Handling (WASC-20)

desc.structural.objc.insecure_ipc_missing_content_validation

Abstract

O controlador de exibição de extensão não consegue validar os dados enviados do aplicativo host.

Explanation


    import MobileCoreServices

    class ShareViewController: SLComposeServiceViewController {
        
        ... 

        override func didSelectPost() {
            let extensionItem = extensionContext?.inputItems.first as! NSExtensionItem
            let itemProvider = extensionItem.attachments?.first as! NSItemProvider
            ...
            // Use the received items
            ...
            self.extensionContext?.completeRequestReturningItems([], completionHandler:nil)
        }

        ...
    }