29 vulnerabilities classified as CWE-124 (缓冲区下溢). AI Chinese analysis included.
CWE-124, known as Buffer Underwrite or Buffer Underflow, is a critical memory safety weakness where software writes data to a memory location preceding the intended buffer’s start. This occurs when an index or pointer is incorrectly calculated, often due to signed integer underflows or improper boundary checks, causing the write operation to overwrite adjacent memory structures. Attackers typically exploit this vulnerability to corrupt critical data, such as function return addresses or security metadata, potentially leading to arbitrary code execution or system crashes. To prevent such issues, developers must implement rigorous bounds checking, utilize static analysis tools to detect pointer arithmetic errors, and adopt safe programming languages or libraries that enforce memory safety. Additionally, employing compiler protections like stack canaries and address space layout randomization can mitigate the impact of underflow attempts, ensuring that memory access remains strictly within allocated boundaries.
char* trimTrailingWhitespace(char *strMessage, int length) { char *retMessage; char *message = malloc(sizeof(char)*(length+1)); // copy input string to a temporary string char message[length+1]; int index; for (index = 0; index < length; index++) { message[index] = strMessage[index]; } message[index] = '\0'; // trim trailing whitespace int len = index-1; while (isspace(message[len])) { message[len] = '\0'; len--; } // return string without trailing whitespace retMessage = message; return retMessage; }int main() { ... char *result = strstr(destBuf, "Replace Me"); int idx = result - destBuf; strcpy(&destBuf[idx], srcBuf); ... }Vulnerabilities classified as CWE-124 (缓冲区下溢) represent 29 CVEs. The CWE taxonomy describes the weakness; review individual CVEs for product-specific impact.