CWE-334 随机数的空间太小
Small Space of Random Values
结构: Simple
Abstraction: Base
状态: Draft
被利用可能性: unkown
基本描述
The number of possible random values is smaller than needed by the product, making it more susceptible to brute force attacks.
相关缺陷
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cwe_Nature: ChildOf cwe_CWE_ID: 330 cwe_View_ID: 1000 cwe_Ordinal: Primary
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cwe_Nature: ChildOf cwe_CWE_ID: 330 cwe_View_ID: 699 cwe_Ordinal: Primary
适用平台
Language: {'cwe_Class': 'Language-Independent', 'cwe_Prevalence': 'Undetermined'}
常见的影响
| 范围 | 影响 | 注释 |
|---|---|---|
| ['Access Control', 'Other'] | ['Bypass Protection Mechanism', 'Other'] | An attacker could easily guess the values used. This could lead to unauthorized access to a system if the seed is used for authentication and authorization. |
可能的缓解方案
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").
示例代码
例
The following XML example code is a deployment descriptor for a Java web application deployed on a Sun Java Application Server. This deployment descriptor includes a session configuration property for configuring the session ID length.
bad XML
...
This deployment descriptor has set the session ID length for this Java web application to 8 bytes (or 64 bits). The session ID length for Java web applications should be set to 16 bytes (128 bits) to prevent attackers from guessing and/or stealing a session ID and taking over a user's session.
Note for most application servers including the Sun Java Application Server the session ID length is by default set to 128 bits and should not be changed. And for many application servers the session ID length cannot be changed from this default setting. Check your application server documentation for the session ID length default setting and configuration options to ensure that the session ID length is set to 128 bits.
分析过的案例
| 标识 | 说明 | 链接 |
|---|---|---|
| CVE-2002-0583 | Product uses 5 alphanumeric characters for filenames of expense claim reports, stored under web root. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-0583 |
| CVE-2002-0903 | Product uses small number of random numbers for a code to approve an action, and also uses predictable new user IDs, allowing attackers to hijack new accounts. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-0903 |
| CVE-2003-1230 | SYN cookies implementation only uses 32-bit keys, making it easier to brute force ISN. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2003-1230 |
| CVE-2004-0230 | Complex predictability / randomness (reduced space). | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0230 |
分类映射
| 映射的分类名 | ImNode ID | Fit | Mapped Node Name |
|---|---|---|---|
| PLOVER | Small Space of Random Values |
引用
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