CWE-194 - Unexpected Sign Extension
- 摘要：Variant
- 结构：Simple
- 状态：Incomplete
- 发布日期：2006-07-19
- 更新日期：2025-12-11
名称
Unexpected Sign Extension
描述
The product performs an operation on a number that causes it to be sign extended when it is transformed into a larger data type. When the original number is negative, this can produce unexpected values that lead to resultant weaknesses.
常见后果
范围：Integrity, Confidentiality, Availability, Other
影响：Read Memory, Modify Memory, Other
注释：When an unexpected sign extension occurs in code that operates directly on memory buffers, such as a size value or a memory index, then it could cause the program to write or read outside the boundaries of the intended buffer. If the numeric value is associated with an application-level resource, such as a quantity or price for a product in an e-commerce site, then the sign extension could produce a value that is much higher (or lower) than the application's allowable range.