界: Security Features

ソフトウェアのセキュリティは、セキュリティソフトウェアではありません。ここでは、認証、アクセス制御、機密性、暗号化、権限管理などのトピックについて説明します。

Privacy Violation: Incomplete Credential Removal

Objective-C
Swift

Abstract

この特定のメソッドは、NSURLCredential インスタンスをローカルに削除しますが、他のデバイスおよび iCloud に格納されているコピーは削除できません。

Explanation

ユーザー名/パスワードのペアまたはクライアント証明書の形式でのユーザーの認証情報を含む NSURLCredential のインスタンスを作成する場合、永続的な属性を定義する必要があります。設定可能な値は、以下のとおりです。

- NSURLCredentialPersistenceNone: 認証情報は格納できません。
- NSURLCredentialPersistenceForSession: 認証情報はこのセッションについてのみ格納する必要があります。
- NSURLCredentialPersistencePermanent: 認証情報はキーチェーンに格納する必要があります。
- NSURLCredentialPersistenceSynchronizable: 認証情報はキーチェーンに永続的に格納し、所有する Apple ID に基づいて他のデバイスに配布する必要があります。

NSURLCredentialPersistenceSynchronizable 認証情報は他のデバイスおよび iCloud に配布されるため、すべての場所から認証情報を完全に削除できない場合、漏えいする可能性のあるインスタンスが残ることになります。

例 1: 次のコードスニペットは、同期可能な認証情報を作成して使用し、ローカルに削除しますが、他のデバイスおよび iCloud からは削除できません。


    ...
    // Create the credential
	NSURLCredential *credential = [NSURLCredential credentialWithUser:user password:password persistence:NSURLCredentialPersistenceSynchronizable]; 
    NSURLCredentialStorage *shared = [NSURLCredentialStorage sharedCredentialStorage];
    [shared setDefaultCredential:credential forProtectionSpace:protectionSpace]; 

    // Use the credential as needed
    ...

    // Removes the credential
    [shared removeCredential:credential forProtectionSpace:protectionSpace];
    ...

References

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

[2] Standards Mapping - Common Weakness Enumeration CWE ID 359

[3] Standards Mapping - Common Weakness Enumeration Top 25 2019 [4] CWE ID 200

[4] Standards Mapping - Common Weakness Enumeration Top 25 2020 [7] CWE ID 200

[5] Standards Mapping - Common Weakness Enumeration Top 25 2021 [20] CWE ID 200

[6] Standards Mapping - Common Weakness Enumeration Top 25 2024 [17] CWE ID 200

[7] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002475

[8] Standards Mapping - General Data Protection Regulation (GDPR) Privacy Violation

[9] Standards Mapping - NIST Special Publication 800-53 Revision 4 AC-4 Information Flow Enforcement (P1), SC-28 Protection of Information at Rest (P1)

[10] Standards Mapping - NIST Special Publication 800-53 Revision 5 AC-4 Information Flow Enforcement, SC-28 Protection of Information at Rest

[11] Standards Mapping - OWASP Application Security Verification Standard 4.0 8.2.2 Client-side Data Protection (L1 L2 L3), 8.3.4 Sensitive Private Data (L1 L2 L3), 10.2.1 Malicious Code Search (L2 L3)

[12] Standards Mapping - OWASP Mobile 2014 M2 Insecure Data Storage

[13] Standards Mapping - OWASP Mobile 2024 M6 Inadequate Privacy Controls

[14] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-STORAGE-1

[15] Standards Mapping - OWASP Top 10 2004 A8 Insecure Storage

[16] Standards Mapping - OWASP Top 10 2007 A6 Information Leakage and Improper Error Handling

[17] Standards Mapping - OWASP Top 10 2013 A6 Sensitive Data Exposure

[18] Standards Mapping - OWASP Top 10 2017 A3 Sensitive Data Exposure

[19] Standards Mapping - OWASP Top 10 2021 A02 Cryptographic Failures

[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 3.2, Requirement 3.4, Requirement 4.2, Requirement 8.4

[21] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 3.2, Requirement 3.4, Requirement 4.2, Requirement 6.5.6, Requirement 8.4

[22] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 3.2, Requirement 3.4, Requirement 4.2, Requirement 6.5.5, Requirement 8.4

[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 3.2, Requirement 3.4, Requirement 4.2, Requirement 6.5.5, Requirement 8.2.1

[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 3.2, Requirement 3.4, Requirement 4.2, Requirement 6.5.5, Requirement 8.2.1

[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 3.2, Requirement 3.4, Requirement 4.2, Requirement 6.5.5, Requirement 8.2.1

[26] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 3.2, Requirement 3.4, Requirement 4.2, Requirement 6.5.5, Requirement 8.2.1

[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 3.3.1, Requirement 3.5.1, Requirement 4.2.2, Requirement 6.2.4, Requirement 8.3.1

[28] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 3.3.1, Requirement 3.3.2, Requirement 3.3.3, Requirement 3.5.1, Requirement 4.2.2, Requirement 6.2.4, Requirement 8.3.1

[29] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 3.3 - Sensitive Data Retention, Control Objective 6.1 - Sensitive Data Protection, Control Objective 7 - Use of Cryptography

[30] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 3.3 - Sensitive Data Retention, Control Objective 6.1 - Sensitive Data Protection, Control Objective 7 - Use of Cryptography

[31] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 3.3 - Sensitive Data Retention, Control Objective 6.1 - Sensitive Data Protection, Control Objective 7 - Use of Cryptography

[32] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3210.1 CAT II, APP3310 CAT I, APP3340 CAT I

[33] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3210.1 CAT II, APP3340 CAT I

[34] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3210.1 CAT II, APP3340 CAT I

[35] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3210.1 CAT II, APP3340 CAT I

[36] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3210.1 CAT II, APP3340 CAT I

[37] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3210.1 CAT II, APP3340 CAT I

[38] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3210.1 CAT II, APP3340 CAT I

[39] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002340 CAT II

[40] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002340 CAT II

[41] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002340 CAT II

[42] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002340 CAT II

[43] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002340 CAT II

[44] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002340 CAT II

[45] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002340 CAT II

[46] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002340 CAT II

[47] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002340 CAT II

[48] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002340 CAT II

[49] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002340 CAT II

[50] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002340 CAT II

[51] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002340 CAT II

[52] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002340 CAT II

[53] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002340 CAT II

[54] Standards Mapping - Web Application Security Consortium Version 2.00 Information Leakage (WASC-13)

[55] Standards Mapping - Web Application Security Consortium 24 + 2 Information Leakage

desc.structural.objc.privacy_violation_incomplete_credential_removal

Abstract

Explanation


    ...
    // Create the credential
    let credential = NSURLCredential(user:foo, password:password, persistence:.Synchronizable) 
    let shared = NSURLCredentialStorage.sharedCredentialStorage()
    shared.setCredential(credential, forProtectionSpace:protectionSpace)

    // Use the credential as needed
    ...

    // Removes the credential
    shared.removeCredential(credential, forProtectionSpace:protectionSpace)
    ...