CWE-483 不正确的代码块分界

Incorrect Block Delimitation

结构: Simple

Abstraction: Variant

状态: Draft

被利用可能性: Low

基本描述

The code does not explicitly delimit a block that is intended to contain 2 or more statements, creating a logic error.

扩展描述

In some languages, braces (or other delimiters) are optional for blocks. When the delimiter is omitted, it is possible to insert a logic error in which a statement is thought to be in a block but is not. In some cases, the logic error can have security implications.

相关缺陷

• cwe_Nature: ChildOf cwe_CWE_ID: 670 cwe_View_ID: 1000 cwe_Ordinal: Primary

适用平台

Language: [{'cwe_Name': 'C', 'cwe_Prevalence': 'Sometimes'}, {'cwe_Name': 'C++', 'cwe_Prevalence': 'Sometimes'}]

常见的影响

可能的缓解方案

Implementation

策略:

Always use explicit block delimitation and use static-analysis technologies to enforce this practice.

示例代码

例

In this example, the programmer has indented the statements to call Do_X() and Do_Y(), as if the intention is that these functions are only called when the condition is true. However, because there are no braces to signify the block, Do_Y() will always be executed, even if the condition is false.

bad C

This might not be what the programmer intended. When the condition is critical for security, such as in making a security decision or detecting a critical error, this may produce a vulnerability.

例

In this example, the programmer has indented the Do_Y() statement as if the intention is that the function should be associated with the preceding conditional and should only be called when the condition is true. However, because Do_X() was called on the same line as the conditional and there are no braces to signify the block, Do_Y() will always be executed, even if the condition is false.

bad C

This might not be what the programmer intended. When the condition is critical for security, such as in making a security decision or detecting a critical error, this may produce a vulnerability.

分析过的案例

分类映射

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