界: Input Validation and Representation

入力の検証や表現の問題は、メタキャラクター、代替エンコーディング、数値表現などによって引き起こされます。セキュリティの問題は、入力を信頼することに起因します。この問題に含まれるのは、「Buffer Overflow」、「Cross-Site Scripting」攻撃、「SQL Injection」などです。

Intent Manipulation: Redirection

Java/JSP

Abstract

外部入力からネスト化された Intent を使用してアクティビティを開始し、サービスを開始し、ブロードキャストを配信すると、攻撃者は内部アプリケーションコンポーネントを自由に起動し、内部コンポーネントの振る舞いを制御し、一時的な権限許可を通してコンテンツプロバイダーから保護データに間接的にアクセスできるようになる可能性があります。

Explanation

Redirection intent manipulation の問題が発生するのは、次の条件に一致した場合です。
1.エクスポートされたコンポーネントは、外部提供による Intent の Extras Bundle にネスト化された任意の Intent を受け入れます。

2.エクスポートされたコンポーネントは、startActivity、startService、または sendBroadcast を呼び出すことで、任意の Intent を使用してコンポーネントを起動します。

攻撃者は、これらの条件が存在する場合、本来は許可されなかったはずの権限を取得できる可能性があります。
例 1: 次のコードでは、外部ソースからのネスト化された Intent を受け入れ、その Intent を使用してアクティビティを開始しています。


...
Intent nextIntent = (Intent) getIntent().getParcelableExtra("next-intent");
startActivity(nextIntent);
...

References

[1] Intent

[2] Remediation for Intent Redirection Vulnerability - Google Help

[3] Nicole Borrelli Android Nesting Intents

[4] Standards Mapping - CIS Azure Kubernetes Service Benchmark 3.0

[5] Standards Mapping - CIS Microsoft Azure Foundations Benchmark complete

[6] Standards Mapping - CIS Amazon Elastic Kubernetes Service Benchmark 4.0

[7] Standards Mapping - CIS Amazon Web Services Foundations Benchmark 1

[8] Standards Mapping - CIS Google Kubernetes Engine Benchmark integrity

[9] Standards Mapping - CIS Kubernetes Benchmark partial

[10] Standards Mapping - Common Weakness Enumeration CWE ID 99

[11] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754

[12] Standards Mapping - FIPS200 SI

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

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

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

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

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

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

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

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

[21] Standards Mapping - OWASP Top 10 2021 A01 Broken Access Control

[22] Standards Mapping - OWASP API 2023 API2 Broken Authentication

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

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

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

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

[27] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.4

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

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

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

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

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

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

[34] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection, Control Objective 5.4 - Authentication and Access Control

[35] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective 5.4 - Authentication and Access Control, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation

[36] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective 5.4 - Authentication and Access Control, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.2.3 - Web Software Access Controls, Control Objective C.3.2 - Web Software Attack Mitigation

[37] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I, APP3600 CAT II

[38] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I, APP3600 CAT II

[39] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I, APP3600 CAT II

[40] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I, APP3600 CAT II

[41] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I, APP3600 CAT II

[42] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I, APP3600 CAT II

[43] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I, APP3600 CAT II

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

desc.dataflow.java.intent_manipulation_redirection