계: Encapsulation

캡슐화는 강력한 경계를 그리는 것입니다. 웹 브라우저에서는 사용자의 모바일 코드가 다른 모바일 코드에 의해 오용되지 않도록 하는 것을 의미합니다. 서버에서는 검증된 데이터와 검증되지 않은 데이터, 한 사용자의 데이터와 다른 사용자의 데이터, 데이터 사용자가 볼 수 있는 데이터와 볼 수 없는 데이터 간의 차별화를 의미할 수 있습니다.

System Information Leak: iOS Property List

Objective-C

Abstract

저장되고 보호되지 않는 시스템 정보(예: 일반 텍스트 파일의 장치 ID)는 시스템 보안을 위협합니다. 시스템 데이터 또는 디버깅 정보가 노출되면 공격자가 시스템을 파악하고 공격 계획을 세우는 것이 수월해집니다.

Explanation

내부 정보는 인쇄나 로깅을 통해 시스템 데이터 또는 디버깅 정보를 로컬 파일이나 콘솔, 화면으로 전송할 때 누출됩니다.

예제 1: 다음의 XML은 plist 파일에 저장된 장치에 대한 시스템 정보를 포함하고 있습니다. 저장되는 다른 값 중에 UDID 키는 UDID(Unique Device Identifier)를 저장합니다.



<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>systemName</key>
  <string>John's iPhone</string>
  <key>systemInfo</key>
  <dict>
          <key>UDID</key>
          <string>2b6f0cc904d137be2e1730235f5664094b831186</string>
          <key>systemVersion</key>
          <string>4.2</string>
          <key>model</key>
          <string>iPhone</string>
          <key>localizedModel</key>
          <string>iPhone</string>
  </dict>
</dict>
</plist>

Example 1의 코드는 모바일 장치의 사용자 개인 정보를 장치에 저장된 보호되지 않는 plist 파일에 저장합니다. 상당수의 개발자들은 plist 파일을 안전한 저장 위치로 신뢰하고 있지만 시스템 정보와 개인 정보에 대한 우려가 있는 상황에서 무조건 믿어서는 안 됩니다. plist 파일은 장치만 확보한다면 누구라도 읽을 수 있기 때문입니다.

References

[1] Standards Mapping - Common Weakness Enumeration CWE ID 497

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

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

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

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

[6] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001312, CCI-001314, CCI-002420

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

[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 AC-4 Information Flow Enforcement (P1), SC-8 Transmission Confidentiality and Integrity (P1), SI-11 Error Handling (P2)

[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 AC-4 Information Flow Enforcement, SC-8 Transmission Confidentiality and Integrity, SI-11 Error Handling

[10] Standards Mapping - OWASP API 2023 API8 Security Misconfiguration

[11] Standards Mapping - OWASP Application Security Verification Standard 4.0 8.3.4 Sensitive Private Data (L1 L2 L3), 14.3.3 Unintended Security Disclosure Requirements (L1 L2 L3)

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

[13] Standards Mapping - OWASP Mobile 2024 M8 Security Misconfiguration

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

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

[16] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.5.6

[17] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.5

[18] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.5

[19] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.5

[20] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.5

[21] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.5

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

[23] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4

[24] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 3.6 - Sensitive Data Retention

[25] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 3.6 - Sensitive Data Retention

[26] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 3.6 - Sensitive Data Retention

[27] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3620 CAT II

[28] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3620 CAT II

[29] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3620 CAT II

[30] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3620 CAT II

[31] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3620 CAT II

[32] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3620 CAT II

[33] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3620 CAT II

[34] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002480 CAT II, APSC-DV-002570 CAT II, APSC-DV-002580 CAT II

[35] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002480 CAT II, APSC-DV-002570 CAT II, APSC-DV-002580 CAT II

[36] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002480 CAT II, APSC-DV-002570 CAT II, APSC-DV-002580 CAT II

[37] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002480 CAT II, APSC-DV-002570 CAT II, APSC-DV-002580 CAT II

[38] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002480 CAT II, APSC-DV-002570 CAT II, APSC-DV-002580 CAT II

[39] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002480 CAT II, APSC-DV-002570 CAT II, APSC-DV-002580 CAT II

[40] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002480 CAT II, APSC-DV-002570 CAT II, APSC-DV-002580 CAT II

[41] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002480 CAT II, APSC-DV-002570 CAT II, APSC-DV-002580 CAT II

[42] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002480 CAT II, APSC-DV-002570 CAT II, APSC-DV-002580 CAT II

[43] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002480 CAT II, APSC-DV-002570 CAT II, APSC-DV-002580 CAT II

[44] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002480 CAT II, APSC-DV-002570 CAT II, APSC-DV-002580 CAT II

[45] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002480 CAT II, APSC-DV-002570 CAT II, APSC-DV-002580 CAT II

[46] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002480 CAT II, APSC-DV-002570 CAT II, APSC-DV-002580 CAT II

[47] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002480 CAT II, APSC-DV-002570 CAT II, APSC-DV-002580 CAT II

[48] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002480 CAT II, APSC-DV-002570 CAT II, APSC-DV-002580 CAT II

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

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

desc.config.objc.system_information_leak_ios_property_list