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。

Insecure Randomness: Weak Entropy Source

C/C++
Python

Abstract

随机或伪随机数值生成器依赖于一个弱熵源。

Explanation

缺少供随机或伪随机数值生成器使用的正确熵源可能会导致拒绝服务或生成可预测的数字序列。如果随机或伪随机数值生成器使用耗尽的熵源，程序可能会暂停或甚至崩溃，导致拒绝服务。或者，随机或伪随机数值生成器可能会生成可预测的数字。弱的随机或伪随机数字源可能会导致漏洞，比如容易被猜出的临时密码、可预测的加密密钥、会话劫持以及 DNS 欺骗。

例 1： 以下代码使用系统时钟作为熵源：


    ...
    srand (time(NULL));
    r = (rand() % 6) + 1;
    ...

因为系统时钟生成的是可预测的值，因此它不是理想的熵源。这点同样适用于其他非硬件型随机性源，包括系统/输入/输出缓冲区、用户/系统/硬件/网络序列号或地址，以及用户输入。

References

[1] Elaine Barker and John Kelsey NIST DRAFT Special Publication 800-90B: Recommendation for the Entropy Sources Used for Random Bit Generation NIST

[2] Standards Mapping - Common Weakness Enumeration CWE ID 331

[3] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002450

[4] Standards Mapping - FIPS200 MP

[5] Standards Mapping - General Data Protection Regulation (GDPR) Insufficient Data Protection

[6] Standards Mapping - Motor Industry Software Reliability Association (MISRA) C Guidelines 2023 Rule 21.24

[7] Standards Mapping - NIST Special Publication 800-53 Revision 4 SC-13 Cryptographic Protection (P1)

[8] Standards Mapping - NIST Special Publication 800-53 Revision 5 SC-13 Cryptographic Protection

[9] Standards Mapping - OWASP Application Security Verification Standard 4.0 2.3.1 Authenticator Lifecycle Requirements (L1 L2 L3), 2.6.2 Look-up Secret Verifier Requirements (L2 L3), 3.2.2 Session Binding Requirements (L1 L2 L3), 3.2.4 Session Binding Requirements (L2 L3), 6.3.3 Random Values (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 2021 A02 Cryptographic Failures

[17] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.8

[18] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.3, Requirement 6.5.8

[19] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.3

[20] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.3

[21] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.3

[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.3

[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.3

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

[25] 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 6.2.4

[26] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 7.3 - Use of Cryptography

[27] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 7.3 - Use of Cryptography, Control Objective B.2.4 - Terminal Software Design

[28] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 7.3 - Use of Cryptography, Control Objective B.2.4 - Terminal Software Design

[29] Standards Mapping - SANS Top 25 2009 Porous Defenses - CWE ID 330

[30] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3150.2 CAT II

[31] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3150.2 CAT II

[32] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3150.2 CAT II

[33] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3150.2 CAT II

[34] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3150.2 CAT II

[35] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3150.2 CAT II

[36] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3150.2 CAT II

[37] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002010 CAT II, APSC-DV-002050 CAT II

[38] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002010 CAT II, APSC-DV-002050 CAT II

[39] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002010 CAT II, APSC-DV-002050 CAT II

[40] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002010 CAT II, APSC-DV-002050 CAT II

[41] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002010 CAT II, APSC-DV-002050 CAT II

[42] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002010 CAT II, APSC-DV-002050 CAT II

[43] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002010 CAT II, APSC-DV-002050 CAT II

[44] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002010 CAT II, APSC-DV-002050 CAT II

[45] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002010 CAT II, APSC-DV-002050 CAT II

[46] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002010 CAT II, APSC-DV-002050 CAT II

[47] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002010 CAT II, APSC-DV-002050 CAT II

[48] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002010 CAT II, APSC-DV-002050 CAT II

[49] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002010 CAT II, APSC-DV-002050 CAT II

[50] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002010 CAT II, APSC-DV-002050 CAT II

[51] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002010 CAT II, APSC-DV-002050 CAT II

desc.dataflow.cpp.insecure_randomness_weak_entropy_source

Abstract

随机或伪随机数值生成器依赖于一个弱熵源。

Explanation

缺少供随机或伪随机数值生成器使用的正确熵源可能会导致拒绝服务或生成可预测的数字序列。如果随机或伪随机数值生成器使用耗尽的熵源，程序可能会暂停或甚至崩溃，导致拒绝服务。或者，随机或伪随机数值生成器可能会生成可预测的数字。弱随机数源可能会导致出现漏洞，如容易猜对的临时密码、可预测的密钥、会话劫持和 DNS 欺骗。

例 1： 以下代码使用系统时钟作为熵源：


...
import time
import random

random.seed(time.time())
...