界: Security Features

軟體安全性並非安全性軟體。我們關注驗證、Access Control、保密性、加密以及權限管理之類的主題。

Weak Encryption: Byte Array to String Conversion

Abstract
將加密金鑰轉換為 String 可導致顯著喪失複雜度。
Explanation
安全性較低的加密：以下情況會發生位元組陣列至字串轉換問題：

1. 建立加密金鑰作為位元組陣列


2. 資料會轉換為 String範例 1：以下程式碼會建立加密金鑰，然後將它轉換成 String。


import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
  ...
  KeyGenerator keygen = KeyGenerator.newInstance("AES");
  ...
  SecretKey cryptoKey = keygen.generateKey();
  byte[] rawCryptoKey = cryptoKey.getEncoded();
  ...
  String key = new String(rawCryptoKey);
  ...


這會使用預設系統字元集，將密碼編譯金鑰轉換成 String，但是當提供給建構函式的位元組超過此字元集的有效範圍時，會發生什麼情況則未指定。實際上，key 很可能比原始的 rawCryptoKey 加密金鑰顯著喪失複雜度。
References
[1] STR03-J. Do not encode noncharacter data as a string CERT
[2] When 'EFBFBD' and Friends Come Knocking: Observations of Byte Array to String Conversions GDS Security
[3] Standards Mapping - Common Weakness Enumeration CWE ID 320
[4] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002450
[5] Standards Mapping - FIPS200 MP
[6] Standards Mapping - General Data Protection Regulation (GDPR) Insufficient Data Protection
[7] Standards Mapping - NIST Special Publication 800-53 Revision 4 AU-10 Non-Repudiation (P2), SC-12 Cryptographic Key Establishment and Management (P1), SC-13 Cryptographic Protection (P1)
[8] Standards Mapping - NIST Special Publication 800-53 Revision 5 AU-10 Non-Repudiation, SC-12 Cryptographic Key Establishment and Management, SC-13 Cryptographic Protection
[9] Standards Mapping - OWASP Application Security Verification Standard 4.0 1.6.2 Cryptographic Architectural Requirements (L2 L3), 2.8.2 Single or Multi Factor One Time Verifier Requirements (L2 L3), 2.9.1 Cryptographic Software and Devices Verifier Requirements (L2 L3), 2.6.3 Look-up Secret Verifier Requirements (L2 L3), 6.4.2 Secret Management (L2 L3), 6.2.1 Algorithms (L1 L2 L3)
[10] Standards Mapping - OWASP Mobile 2014 M6 Broken Cryptography
[11] Standards Mapping - OWASP Mobile 2024 M10 Insufficient Cryptography
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CRYPTO-1
[13] Standards Mapping - OWASP Top 10 2004 A8 Insecure Storage
[14] Standards Mapping - OWASP Top 10 2007 A8 Insecure Cryptographic Storage
[15] Standards Mapping - OWASP Top 10 2010 A7 Insecure Cryptographic Storage
[16] Standards Mapping - OWASP Top 10 2013 A6 Sensitive Data Exposure
[17] Standards Mapping - OWASP Top 10 2017 A3 Sensitive Data Exposure
[18] Standards Mapping - OWASP Top 10 2021 A02 Cryptographic Failures
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 3.6.1, Requirement 6.5.8
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 3.6.1, Requirement 6.3.1.3, Requirement 6.5.8
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 3.6.1, Requirement 6.5.3
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 3.6.1, Requirement 6.5.3
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 3.6.1, Requirement 6.5.3
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 3.6.1, Requirement 6.5.3
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 3.6.1, Requirement 6.5.3
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 3.6.1, Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 3.3.2, Requirement 3.3.3, Requirement 3.5.1, Requirement 3.6.1, Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 7.1 - Use of Cryptography, Control Objective 7.4 - Use of Cryptography
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 7.1 - Use of Cryptography, Control Objective 7.4 - Use of Cryptography, Control Objective B.2.3 - Terminal Software Design
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 7.1 - Use of Cryptography, Control Objective 7.4 - Use of Cryptography, Control Objective B.2.3 - Terminal Software Design
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3150.1 CAT II
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3150.1 CAT II
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3150.1 CAT II
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3150.1 CAT II
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3150.1 CAT II
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3150.1 CAT II
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3150.1 CAT II
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-000590 CAT II, APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-000590 CAT II, APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
desc.dataflow.java.weak_encryption_byte_array_to_string_conversion