CVE-2026-43860 Mutt IMAP认证截断漏洞

# PoC for CVE-2026-43860 (Conceptual) # This script demonstrates the hash truncation logic vulnerability. import hmac import hashlib def calculate_vulnerable_digest(challenge, password): """ Simulates the vulnerable implementation in Mutt < 2.3.2 where the resulting hex digest is truncated by one byte. """ # Calculate standard HMAC-MD5 digest = hmac.new(password.encode(), challenge.encode(), hashlib.md5).digest() hex_digest = digest.hex() # VULNERABILITY: Truncate the last byte (2 hex characters) vulnerable_digest = hex_digest[:-2] return vulnerable_digest # Example Scenario imap_challenge = "<[email protected]>" user_password = "secret_password" print(f"Original Challenge: {imap_challenge}") print(f"Vulnerable Digest: {calculate_vulnerable_digest(imap_challenge, user_password)}") # An attacker would send this truncated digest in the IMAP AUTHENTICATE command.