This script is Copyright (C) 2016 Tenable Network Security, Inc.
The remote Samba server is affected by a signature downgrade
The version of Samba running on the remote host is 4.x prior to
4.2.14, 4.3.x prior to 4.3.11, or 4.4.x prior to 4.4.5. It is,
therefore, affected by a flaw in libcli/smb/smbXcli_base.c that is
triggered when handling SMB2 and SMB3 client connections. A
man-in-the-middle attacker can exploit this, by injecting the
SMB2_SESSION_FLAG_IS_GUEST or SMB2_SESSION_FLAG_IS_NULL flags, to
downgrade the required signing for a client connection, allowing the
attacker to spoof SMB2 and SMB3 servers.
See also :
Upgrade to Samba version 4.2.14 / 4.3.11 / 4.4.5 or later.
Risk factor :
Medium / CVSS Base Score : 6.8
CVSS Temporal Score : 5.0
Public Exploit Available : false