It is in charge of, in the midst of other things, shared printer admittance, Microsoft DS file sharing, and other sorts of network connection including, for example, NetBIOS. On the other hand, older programs, for the most part, require this interface. Port is associated with SMB Service Message Block , an application layer network protocol that is mostly used for file sharing, printer sharing, and serial port sharing.
Port is vulnerable to security assaults, according to security researchers, and should be deactivated. There are several claims on the Internet and at Microsoft that port has severe flaws and is thus vulnerable to hacking assaults. Malicious software can also infiltrate it, hence it is normally advised to deactivate it. However, it will also prevent you from file and printer sharing, thus you may need to allow the port in the internal firewall to use such sharing services.
To check whether port is listening by the system or not, if you get an empty result then you successfully blocked it. Whereas if you require it sometimes, then alternatively , you can use your firewall to safeguard it. To accomplish this, configure them so that no outbound traffic is permitted through the open port. Although all services remain operational, however, accidentally entered malware would be unable to connect to the Internet or other computers.
This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Please rate your experience Yes No. Any additional feedback? Except for helpless waiting for the cure, there are some things we can do to prevent infection and make things better. It is said that the WannaCry virus infect hard drive via TCP port which opened by system during installing, so does to Petya variant virus. Following details how to block port in Windows 7, 10, and XP in easy and simple ways.
But before that, you may want to know what TCP port is used for, so is the port Port and port are Windows ports. They all serve Windows File and Printer Sharing. Keep port and port opened will leave the hard disks exposed on this port, i. You may understand port in this way. If you close port , you will not be able to copy any file system data to or from the path where port is closed.
In terms of domain host, this will definitely break group policy. You will lose browsing capabilities to networks past the intranet network as well. Although the port is opened by system on Windows in most cases, it is necessary to check it on your host. In one or two seconds, the picture will show up. This means the TCP port is opened. Since it is one of the most dangerous ports on the Internet and made way for WannaCry attack, closing it becomes urgent.
There are three methods to disable port in Windows 10, 7 and XP in total. All are simple and easy to follow. User level protection was later added to the SMB protocol. It is applied to individual files and each share is based on specific user access rights. To identify the following information of Windows or Samba system, every pentester go for SMB enumeration during network penetration testing.
Here you can observe, we are using nmap the most famous network scanning tool for SMB enumeration. As a result, we enumerated the following information about the target machine:. During the enumeration phase, generally, we go for banner grabbing to identify a version of running service and the host operating system. Once you enumerate this information then you should go for vulnerability scanning phase to identify whether the install service is a vulnerable version or patched version.
Nmap serves various scripts to identify a state of vulnerability for specific services, similarly, it has the inbuilt script for SMB to identify its vulnerable state for given target IP. As result, it has shown the target machine is highly vulnerable to Ms eternal blue due to SMBv1. As we know it is vulnerable to MS and we can use Metasploit to exploit this machine. Therefore we run the following module which will directly exploit the target machine.
We have successfully access remote machine shell as shown in the bellow image. Here we only need two dictionaries that contain a list of username and password in each and a brute force tool to make brute force attack. Once the commands are executed it will start applying the dictionary attack and so you will have the right username and password in no time. After a few minutes, Hydra cracks the credential, as you can observe that we had successfully grabbed the SMB username as raj and password as Once you have SMB login credential of target machine then with the help of the following module of Metasploit you can obtain meterpreter session to access the remote shell.
There so many script and tools are available to connect remote machine using SMB protocol, we have already written an article for connecting SMB in multiple ways.
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