CWE-597: Use of Wrong Operator in String Comparison
CWE版本: 4.18
更新日期: 2025-09-09
弱点描述
The product uses the wrong operator when comparing a string, such as using "==" when the .equals() method should be used instead.
扩展描述
In Java, using == or != to compare two strings for equality actually compares two objects for equality rather than their string values for equality. Chances are good that the two references will never be equal. While this weakness often only affects program correctness, if the equality is used for a security decision, the unintended comparison result could be leveraged to affect program security.
常见后果
影响范围: Other
技术影响: Other
潜在缓解措施
阶段: Implementation
描述: Within Java, use .equals() to compare string values. Within JavaScript, use == to compare string values. Within PHP, use == to compare a numeric value to a string value. (PHP converts the string to a number.)
有效性: High
检测方法
方法: Automated Static Analysis
Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)
有效性: High
引入模式
| 阶段 | 说明 |
|---|---|
| Implementation | - |
分类映射
| 分类名称 | 条目ID | 条目名称 | 映射适配度 |
|---|---|---|---|
| The CERT Oracle Secure Coding Standard for Java (2011) | EXP03-J | Do not use the equality operators when comparing values of boxed primitives | - |
| The CERT Oracle Secure Coding Standard for Java (2011) | EXP03-J | Do not use the equality operators when comparing values of boxed primitives | - |
| SEI CERT Perl Coding Standard | EXP35-PL | Use the correct operator type for comparing values | CWE More Specific |
| Software Fault Patterns | SFP1 | Glitch in computation | - |