CWE-466 (在预期范围外返回指针值) — Vulnerability Class 7

CWE-466 represents a critical memory safety weakness where a function erroneously returns a pointer referencing memory outside its intended buffer boundaries. This flaw typically arises from off-by-one errors, incorrect boundary checks, or miscalculated array indices during pointer arithmetic. Attackers exploit this vulnerability by crafting inputs that trigger the erroneous return, allowing them to read sensitive data from adjacent memory regions or write malicious payloads to unauthorized locations. Such exploitation can lead to information disclosure, denial of service, or arbitrary code execution if the attacker gains control over the returned pointer’s usage. To mitigate this risk, developers must rigorously validate all pointer arithmetic operations and ensure strict adherence to buffer limits. Implementing comprehensive unit tests that cover edge cases, utilizing static analysis tools to detect out-of-bounds returns, and employing safe programming languages with automatic memory management are essential strategies for preventing this class of memory corruption vulnerabilities.