CWE-680 (整数溢出导致缓冲区溢出) — Vulnerability Class 85

CWE-680 is a critical logic flaw where an arithmetic calculation intended to determine buffer size results in an integer overflow, causing the system to allocate insufficient memory. Attackers typically exploit this vulnerability by manipulating input values to trigger the overflow, resulting in a smaller allocation than required for the actual data size. When the application subsequently copies the full-sized data into this undersized buffer, it overwrites adjacent memory, potentially allowing arbitrary code execution or system compromise. To prevent this, developers must implement robust input validation to ensure values remain within safe bounds before performing arithmetic operations. Additionally, using safe libraries that detect overflow conditions, employing larger data types for intermediate calculations, and utilizing static analysis tools can effectively identify and mitigate these dangerous logic errors during the development lifecycle.