Is SMB Port 445 Secure?

Should I disable port 445?

We also recommend blocking port 445 on internal firewalls to segment your network – this will prevent internal spreading of the ransomware.

Note that blocking TCP 445 will prevent file and printer sharing – if this is required for business, you may need to leave the port open on some internal firewalls..

Should you disable SMB?

For a certain kind of secure communication, Server Message Block (SMB) is no longer suited for the task. Windows machines use SMB to pass files around a network. … SMBv1 is so insecure that most security experts now recommend that administrators disable it entirely via a group policy update.

How do I protect port 445?

How To Keep These Ports SecureEnable a firewall or endpoint protection to protect these ports from attackers. … Install a VPN to encrypt and protect network traffic.Implement VLANs to isolate internal network traffic.Use MAC address filtering to keep unknown systems from accessing the network.Sep 24, 2020

What is port 445 commonly used for?

TCP port 445 is used for direct TCP/IP MS Networking access without the need for a NetBIOS layer. This service is only implemented in the more recent verions Windows starting with Windows 2000 and Windows XP. The SMB (Server Message Block) protocol is used among other things for file sharing in Windows NT/2K/XP.

Is SMB v2 secure?

SMB1 is certainly fraught with security issues and should be discouraged. SMB2 is still fine and if disabled may cause some scanners to stop scan to folder and other options (and other devices might stop working as well as most have only just stopped using SMB1).

Should I block port 139?

Inbound connection in port 139 (TCP) is not blocked in Windows firewall. Port 139 is utilized by NetBIOS Session service. … Therefore it is advisable to block port 139 in the Firewall.

How do I know if my port 445 is blocked?

Know if Your Port 445 is Enabled or Not Press Windows + R key combo to start Run box. Input “cmd” to start Command Prompt. Then type: “netstat –na” and press Enter. “netstat –na” command means scan all connected port and showing in numbers.

Which ports should I block?

For example, the SANS Institute recommends blocking outbound traffic that uses the following ports:MS RPC – TCP & UDP port 135.NetBIOS/IP – TCP & UDP ports 137-139.SMB/IP – TCP port 445.Trivial File Transfer Protocol (TFTP) – UDP port 69.Syslog – UDP port 514.More items…•Oct 16, 2015

How do I unblock port 445?

To add a firewall rule to allow TCP/445 (SMB/CIFS) and TCP/135 (RPC): Go to Computer Configuration > Policies > Windows Settings > Security Settings > Windows Firewall with Advanced Security > Windows Firewall with Advanced Security – LDAP > Inbound Rules. Right-click and choose New Rule. Choose Port and click Next.

What is port 139 commonly used for?

The port 139 is used for File and Printer Sharing but happens to be the single most dangerous Port on the Internet. This is so because it leaves the hard disk of a user exposed to hackers.

Is SMB secure?

The support article defined SMB as “a network file sharing and data fabric protocol” that’s used by various operating systems, “including Windows, MacOS, iOS, Linux and Android.” This SMB traffic can be protected at the firewall level, though.

What ports are affected by WannaCry?

The malware, known as ‘WannaCry’ has the capability to scan port TCP 445 (Server Message Block/SMB) spreading like a worm by exploiting CVE-2017-0147 (MS17-010) using the ETERNALBLUE modules and the DOUBLEPULSAR backdoor brought to the public by The Shadow Brokers group last April.