界: Security Features

软件安全不是安全软件。此处我们关注的主题包括身份验证、Access Control、机密性、加密和权限管理。

Weak Encryption: Byte Array to String Conversion

Abstract
将加密密钥转换为 String 会导致熵大量丢失。
Explanation
弱加密：字节数组至字符串转换问题将在以下情况下出现：

1. 加密密钥创建为字节数组


2. 将数据转换为 String示例 1：以下代码创建了加密密钥，然后将其转换为 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);
  ...


这使用默认系统字符集将加密密钥转换为 String，但是对于为构造函数分配了字符集有效范围外的字节时将发生何种变化，却没有相关说明。事实上，与原始的 rawCryptoKey 加密密钥相比，key 很可能会造成熵的大量丢失。
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