CWE-342 从先前值可预测准确值

Predictable Exact Value from Previous Values

结构: Simple

Abstraction: Base

状态: Draft

被利用可能性: unkown

基本描述

An exact value or random number can be precisely predicted by observing previous values.

适用平台

Language: {'cwe_Class': 'Language-Independent', 'cwe_Prevalence': 'Undetermined'}

常见的影响

范围	影响	注释
Other	Varies by Context

可能的缓解方案

策略:

Increase the entropy used to seed a PRNG.

MIT-2 ['Architecture and Design', 'Requirements']

策略: Libraries or Frameworks

Use products or modules that conform to FIPS 140-2 [REF-267] to avoid obvious entropy problems. Consult FIPS 140-2 Annex C ("Approved Random Number Generators").

MIT-50 Implementation

策略:

Use a PRNG that periodically re-seeds itself using input from high-quality sources, such as hardware devices with high entropy. However, do not re-seed too frequently, or else the entropy source might block.

分析过的案例

标识	说明	链接
CVE-2002-1463	Firewall generates easily predictable initial sequence numbers (ISN), which allows remote attackers to spoof connections.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-1463
CVE-1999-0074	Listening TCP ports are sequentially allocated, allowing spoofing attacks.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-1999-0074
CVE-1999-0077	Predictable TCP sequence numbers allow spoofing.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-1999-0077
CVE-2000-0335	DNS resolver uses predictable IDs, allowing a local user to spoof DNS query results.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2000-0335

分类映射

映射的分类名	ImNode ID	Fit	Mapped Node Name
PLOVER			Predictable Exact Value from Previous Values

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