MediaTek display组件未初始化数据导致本地权限提升漏洞(CVE-2025-20784)

// CVE-2025-20784 PoC - MediaTek Display Uninitialized Memory // Note: This is a conceptual PoC for demonstration purposes // Actual exploitation requires system-level access #include <stdio.h> #include <stdlib.h> #include <string.h> // Simulate the vulnerable data structure struct display_frame_data { unsigned int width; unsigned int height; unsigned int format; unsigned int buffer_ptr; // Uninitialized in vulnerable version unsigned int metadata; // Uninitialized in vulnerable version }; // Vulnerable function - buffer_ptr not initialized void process_display_frame_uninitialized(struct display_frame_data *frame) { // Simulate frame processing printf("Processing frame: %dx%d, format=%d\n", frame->width, frame->height, frame->format); // Vulnerable: Using uninitialized buffer_ptr unsigned int *frame_buffer = (unsigned int *)frame->buffer_ptr; // This could cause memory corruption if buffer_ptr contains garbage if (frame->buffer_ptr != 0) { printf("[!] Accessing potentially malicious buffer at: 0x%x\n", frame->buffer_ptr); // In real exploitation, this would be used to corrupt memory } } // Fixed function - proper initialization void process_display_frame_fixed(struct display_frame_data *frame) { // Initialize all fields before use frame->buffer_ptr = 0; frame->metadata = 0; printf("Processing frame: %dx%d, format=%d\n", frame->width, frame->height, frame->format); // Safe access with initialized pointer if (frame->buffer_ptr != 0) { printf("[+] Buffer initialized safely at: 0x%x\n", frame->buffer_ptr); } } int main() { printf("CVE-2025-20784 - MediaTek Display Uninitialized Memory PoC\n"); printf("=========================================================\n\n"); // Create frame with uninitialized fields struct display_frame_data vulnerable_frame; memset(&vulnerable_frame, 0, sizeof(vulnerable_frame)); vulnerable_frame.width = 1920; vulnerable_frame.height = 1080; vulnerable_frame.format = 1; // Note: buffer_ptr and metadata intentionally not initialized printf("[VULNERABLE] Processing frame without initialization:\n"); process_display_frame_uninitialized(&vulnerable_frame); printf("\n[FIXED] Processing frame with proper initialization:\n"); process_display_frame_fixed(&vulnerable_frame); return 0; }