CVE-2026-20446 MediaTek安全启动整数溢出漏洞

#include <stdio.h> #include <stdint.h> // Conceptual PoC demonstrating Integer Overflow leading to Out-of-Bounds Write // This simulates the logic flaw in the sec boot component void trigger_vulnerability(uint32_t data_size) { // Simulate the integer overflow condition // If data_size is large (e.g., 0xFFFFFFFF), adding 1 wraps to 0 uint32_t alloc_size = data_size + 1; if (alloc_size < data_size) { printf("Integer overflow detected in allocation size calculation.\n"); // In the vulnerable scenario, this check might be missing or bypassed return; } // Allocation based on the overflowed size (potentially very small) char buffer[100]; // Fixed buffer for demonstration // The actual write loop uses the original large size, causing OOB write for (uint32_t i = 0; i < data_size; i++) { // This writes past the buffer boundary if data_size > 100 if (i < 100) { buffer[i] = 'A'; } else { // Memory corruption occurs here *((char*)(buffer + i)) = 'A'; } } } int main() { printf("Simulating CVE-2026-20446 PoC...\n"); // Input value intended to trigger the overflow logic trigger_vulnerability(0xFFFFFFFF); return 0; }