계: Security Features

소프트웨어 보안은 보안 소프트웨어가 아닙니다. 여기서는 인증, 액세스 제어, 기밀성, 암호화, 권한 관리 등의 항목에 대해 설명합니다.

Biometric Authentication: Insecure Touch ID Implementation

Objective-C
Swift

Abstract

응용 프로그램이 LocalAuthentication 프레임워크를 사용하여 사용자를 인증하지만 강화된 보안 제어를 필요로 하는 응용 프로그램에는 충분하지 않을 수 있습니다.

Explanation

터치 ID 기반 인증은 LocalAuthentication 프레임워크를 사용하거나 키 집합 서비스의 터치 ID 기반 액세스 제어를 사용하는 두 가지 방법으로 구현할 수 있습니다.

두 방법 모두 대부분의 응용 프로그램에 대해 충분히 강력하지만 LocalAuthentication 방법은 뱅킹, 의료 및 보험과 같은 고위험 응용 프로그램에는 적합성이 떨어지는 몇 가지 특성을 갖고 있습니다.

- LocalAuthentication은 장치의 Secure Enclave 외부에서 정의되며 이는 해당 API가 탈옥된 장치에서 후크 또는 수정될 수 있음을 의미합니다.
- LocalAuthentication은 true 또는 false로만 평가될 수 있는 컨텍스트 정책을 평가하여 사용자를 인증합니다. 이 부울 평가는 응용 프로그램이 실제 인증되는 사람이 누군인지 알 수 없고 장치에 등록된 지문이 사용되었는지 여부만 안다는 것을 의미합니다. 또한 향후에 등록될 수 있는 지문도 true로 평가됩니다.

예제 1: 다음 코드에서는 LocalAuthentication 프레임워크를 사용하여 사용자 인증을 수행합니다.


    ...
    LAContext *context = [[LAContext alloc] init];  
    NSError *error = nil;  
    NSString *reason = @"Please authenticate using the Touch ID sensor.";
    
    if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {  
        [context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
            localizedReason:reason
                reply:^(BOOL success, NSError *error) {
                    if (success) {
                        // Fingerprint was authenticated
                    } else {
                        // Fingerprint could not be authenticated
                    }
            }
        ];
    ...

References

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

[2] Integrating Touch ID Into Your iOS Applications Cigital

[3] Don't Touch Me That Way nVisium

[4] SecAccessControlCreateFlags Apple

[5] Standards Mapping - Common Weakness Enumeration CWE ID 287

[6] Standards Mapping - Common Weakness Enumeration Top 25 2019 [13] CWE ID 287

[7] Standards Mapping - Common Weakness Enumeration Top 25 2020 [14] CWE ID 287

[8] Standards Mapping - Common Weakness Enumeration Top 25 2021 [14] CWE ID 287

[9] Standards Mapping - Common Weakness Enumeration Top 25 2022 [14] CWE ID 287

[10] Standards Mapping - Common Weakness Enumeration Top 25 2023 [13] CWE ID 287

[11] Standards Mapping - Common Weakness Enumeration Top 25 2024 [14] CWE ID 287

[12] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001958

[13] Standards Mapping - FIPS200 CM, SC

[14] Standards Mapping - General Data Protection Regulation (GDPR) Access Violation

[15] Standards Mapping - NIST Special Publication 800-53 Revision 4 IA-3 Device Identification and Authentication (P1)

[16] Standards Mapping - NIST Special Publication 800-53 Revision 5 IA-3 Device Identification and Authentication

[17] Standards Mapping - OWASP Application Security Verification Standard 4.0 2.7.1 Out of Band Verifier Requirements (L1 L2 L3), 2.7.2 Out of Band Verifier Requirements (L1 L2 L3), 2.7.3 Out of Band Verifier Requirements (L1 L2 L3), 2.8.4 Single or Multi Factor One Time Verifier Requirements (L2 L3), 2.8.5 Single or Multi Factor One Time Verifier Requirements (L2 L3), 3.7.1 Defenses Against Session Management Exploits (L1 L2 L3), 9.2.3 Server Communications Security Requirements (L2 L3)

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

[19] Standards Mapping - OWASP Mobile 2024 M3 Insecure Authentication/Authorization

[20] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-AUTH-1, MASVS-AUTH-2

[21] Standards Mapping - OWASP Top 10 2004 A10 Insecure Configuration Management

[22] Standards Mapping - OWASP Top 10 2007 A9 Insecure Communications

[23] Standards Mapping - OWASP Top 10 2010 A9 Insufficient Transport Layer Protection

[24] Standards Mapping - OWASP Top 10 2021 A07 Identification and Authentication Failures

[25] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 4.1, Requirement 6.5.10

[26] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 4.1, Requirement 6.3.1.4, Requirement 6.5.9

[27] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 4.1, Requirement 6.5.4

[28] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 4.1, Requirement 6.5.4

[29] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 4.1, Requirement 6.5.4

[30] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 4.1, Requirement 6.5.4

[31] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 4.1, Requirement 6.5.4

[32] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 4.2.1, Requirement 6.2.4

[33] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 4.2.1, Requirement 6.2.4

[34] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 5.3 - Authentication and Access Control

[35] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 5.3 - Authentication and Access Control

[36] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 5.3 - Authentication and Access Control, Control Objective C.2.1.2 - Web Software Access Controls

[37] Standards Mapping - SANS Top 25 2010 Porous Defenses - CWE ID 311

[38] Standards Mapping - SANS Top 25 2011 Porous Defenses - CWE ID 311

[39] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3250.1 CAT I, APP3250.2 CAT I, APP3250.3 CAT II, APP3250.4 CAT II

[40] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3250.1 CAT I, APP3250.2 CAT I, APP3250.3 CAT II, APP3250.4 CAT II

[41] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3250.1 CAT I, APP3250.2 CAT I, APP3250.3 CAT II, APP3250.4 CAT II

[42] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3250.1 CAT I, APP3250.2 CAT I, APP3250.3 CAT II, APP3250.4 CAT II

[43] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3250.1 CAT I, APP3250.2 CAT I, APP3250.3 CAT II, APP3250.4 CAT II

[44] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3250.1 CAT I, APP3250.2 CAT I, APP3250.3 CAT II, APP3250.4 CAT II

[45] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3250.1 CAT I, APP3250.2 CAT I, APP3250.3 CAT II, APP3250.4 CAT II

[46] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-001650 CAT II

[47] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-001650 CAT II

[48] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-001650 CAT II

[49] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-001650 CAT II

[50] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-001650 CAT II

[51] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-001650 CAT II

[52] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-001650 CAT II

[53] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-001650 CAT II

[54] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-001650 CAT II

[55] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-001650 CAT II

[56] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-001650 CAT II

[57] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-001650 CAT II

[58] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-001650 CAT II

[59] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-001650 CAT II

[60] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-001650 CAT II

[61] Standards Mapping - Web Application Security Consortium Version 2.00 Insufficient Authentication (WASC-01)

[62] Standards Mapping - Web Application Security Consortium 24 + 2 Insufficient Authentication

desc.dataflow.objc.biometric_authentication_insecure_touch_id_implementation

Abstract

Explanation


    ...
    let context:LAContext = LAContext();  
    var error:NSError?  
    let reason:String = "Please authenticate using the Touch ID sensor."
    
    if (context.canEvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, error: &error))  {
        context.evaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, localizedReason: reason, reply: { (success, error) -> Void in
            if (success) {
                // Fingerprint was authenticated
            }
            else {
                // Fingerprint could not be authenticated
            }
        })
    }
    ...