CWE-343 从先前值可预测取值范围

Predictable Value Range from Previous Values

结构: Simple

Abstraction: Base

状态: Draft

被利用可能性: unkown

基本描述

The software's random number generator produces a series of values which, when observed, can be used to infer a relatively small range of possibilities for the next value that could be generated.

扩展描述

The output of a random number generator should not be predictable based on observations of previous values. In some cases, an attacker cannot predict the exact value that will be produced next, but can narrow down the possibilities significantly. This reduces the amount of effort to perform a brute force attack. For example, suppose the product generates random numbers between 1 and 100, but it always produces a larger value until it reaches 100. If the generator produces an 80, then the attacker knows that the next value will be somewhere between 81 and 100. Instead of 100 possibilities, the attacker only needs to consider 20.

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.

分类映射

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

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