계: Code Quality

코드 품질이 낮으면 예측할 수 없는 동작이 발생합니다. 사용자 입장에서는 사용 편의성이 떨어지는 것으로 나타나는 경우가 많습니다. 공격자에게는 예상치 못한 방법으로 시스템에 부담을 줄 수 있는 기회가 됩니다.

Intent Manipulation: Mutable Pending Intent

Java/JSP

Abstract

플래그 값이 FLAG_MUTABLE로 설정된 PendingIntent가 감지되었습니다. FLAG_MUTABLE 플래그 값으로 생성된 PendingIntent는 지정되지 않은 Intent 필드가 다운스트림으로 설정될 수 있으며, 이로 인해 Intent의 용량을 수정하고 시스템을 취약점에 노출시킬 수 있습니다.

Explanation

PendingIntent의 기본 Intent 수정을 허용하면 생성 후 시스템이 공격에 노출될 수 있습니다. 이는 대개 기본 Intent의 전체적인 기능에 따라 달라집니다. 대부분의 경우 PendingIntent 플래그를 FLAG_IMMUTABLE로 설정하여 잠재적인 문제를 방지하는 것이 모범 사례에 해당합니다.

예제 1: 다음은 FLAG_MUTABLE 플래그 값으로 생성된 PendingIntent를 포함합니다.


...
val intent_flag_mut = Intent(Intent.ACTION_GTALK_SERVICE_DISCONNECTED, Uri.EMPTY, this, DownloadService::class.java)
val flag_mut = PendingIntent.FLAG_MUTABLE

val pi_flagmutable = PendingIntent.getService(
    this,
    0,
    intent_flag_mut,
    flag_mut
)
...

References

[1] Remediation for Implicit PendingIntent Vulnerability

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

[3] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001094

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

[5] Standards Mapping - NIST Special Publication 800-53 Revision 4 SC-5 Denial of Service Protection (P1)

[6] Standards Mapping - NIST Special Publication 800-53 Revision 5 SC-5 Denial of Service Protection

[7] Standards Mapping - OWASP Top 10 2004 A9 Application Denial of Service

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

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

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

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

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

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

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

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

[16] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP6080 CAT II

[17] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP6080 CAT II

[18] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP6080 CAT II

[19] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP6080 CAT II

[20] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP6080 CAT II

[21] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP6080 CAT II

[22] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP6080 CAT II

[23] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002400 CAT II

[24] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002400 CAT II

[25] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002400 CAT II

[26] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002400 CAT II

[27] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002400 CAT II

[28] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002400 CAT II

[29] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002400 CAT II

[30] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002400 CAT II

[31] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002400 CAT II

[32] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002400 CAT II

[33] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002400 CAT II

[34] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002400 CAT II

[35] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002400 CAT II

[36] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002400 CAT II

[37] Standards Mapping - Web Application Security Consortium Version 2.00 Denial of Service (WASC-10)

[38] Standards Mapping - Web Application Security Consortium 24 + 2 Denial of Service

desc.controlflow.java.intent_manipulation_mutable_pending_intent