MediaTek显示组件Use After Free本地权限提升漏洞(CVE-2025-20772)

// CVE-2025-20772 PoC Concept (Requires System Privilege) // This is a conceptual demonstration - actual exploitation requires specific MediaTek device environment /* #include <stdio.h> #include <stdlib.h> #include <string.h> // Simulated display buffer structure struct display_buffer { void* data; size_t size; int ref_count; }; // Vulnerable function demonstrating UAF condition void process_display_buffer(struct display_buffer* buf) { if (buf == NULL) return; // Free the buffer without clearing reference if (buf->ref_count <= 0) { free(buf->data); free(buf); // UAF: buf is freed but pointer may still be used } // Later access to freed memory - vulnerable code path if (buf->size > 0) { // Accessing freed memory memcpy(buf->data, "malicious_data", 14); } } // Heap spray attempt (simplified) void heap_spray_attempt() { // In real scenario: allocate many objects to control heap layout // Then trigger free followed by reuse printf("[*] Attempting heap layout control...\n"); // Allocate objects to fill heap for (int i = 0; i < 1000; i++) { void* ptr = malloc(256); if (ptr) { memset(ptr, 0x41, 256); // Fill with controllable data } } printf("[*] Heap layout manipulation complete\n"); } int main() { printf("CVE-2025-20772 MediaTek Display UAF PoC\n"); printf("Note: Actual exploitation requires: \n"); printf(" - MediaTek device with vulnerable display driver\n"); printf(" - System-level privileges already obtained\n"); printf(" - Knowledge of kernel heap layout\n"); heap_spray_attempt(); // Create and process vulnerable buffer struct display_buffer* buf = malloc(sizeof(struct display_buffer)); buf->data = malloc(1024); buf->size = 1024; buf->ref_count = 0; // Trigger UAF condition process_display_buffer(buf); printf("[*] UAF condition triggered - vulnerability present\n"); return 0; } */ // Note: This PoC is conceptual. Real exploitation requires: // 1. Physical or local access to MediaTek device // 2. System privileges already obtained // 3. Understanding of specific display driver implementation // 4. Ability to control kernel heap allocation patterns