The latter does not mean precisely that everything that may come from outside the network is suspicious or dangerous. It can be understood that, in most cases, SSH traffic from unknown IP addresses to our internal network can signal that the network has been compromised. Therefore, they are reliable IP addresses.įiltering Wireshark requests and internal SSH traffic, in addition to that coming from external IP addresses, will help identify suspicious situations. Knowing that legitimate SSH requests and traffic should originate from the internal network itself. However, it is possible to have control of these machines that act as insecure SSH servers. That’s right, even SSH can count on its particular security holes. Why is this a risk? Anyone who has knowledge about those passwords or the ability to guess users and passwords can easily access the machines remotely. Normally, their associated systems usually use credentials by default or with some minimal modification. One of the biggest drawbacks and risks generated by the rise of emerging technologies such as the Internet of Things is that enabled devices have SSH enabled in the first instance. In addition, we recommend you check the number of login attempts, if you see an irregular number it is because there is a possibility of having been victims of a Credential-Stuffing attack.
The latter refers to packets with shorter life time due to failed authentications. Package time: Those packages that require user interaction, if authentication was successful, will have more time than those that are automated.It is possible to observe the size of the SSH packets and infer that the larger ones constitute successful sessions. Package size: SSH servers have established responses for successful or failed authentication.Flow length (of the session): if it were a successful SSH session, it will be longer than a failed one.However, there are some features that will help us reveal which records are successful: This makes the credential stuffing attacks happen, in most cases, completely unnoticed.įrom good to first it is not easy to differentiate the attempts of access via SSH successful from the unsuccessful ones in Wireshark.
#Wireshark uses in business password
But what about the passwords of the different credentials? Unfortunately, most people tend to use passwords that are very easy to guess or worse, always opt for the same password for all their accounts. We will emphasize the first two below.Ĭonsidering that SSH requires user authentication, an attacker who has access to a machine running an SSH server can carry out attacks of this type without major problems. You can perform Credential-Stuffing attacks, scanning machines that are running on vulnerable SSH servers and setting up reverse shells. You can have remote access and of course it is encrypted to any device that has the SSH server function enabled. Recall that this is a very powerful protocol especially for the encryption with which it has by default. One of the most interesting and important uses for which you can use Wireshark is for the incident response related to SSH traffic. Export of information to XML, PostScript, CSV and plain text formats.Access to live viewing of information from the protocols of Ethernet, Bluetooth, USB, IEEE 802-11 (Wi-Fi), Frame Relay etc.Possibility of reading and modifying information capture files such as tcpdump, Microsoft Network Monitor, NetScreen snoop and more.Information capture at the time for further analysis.In case you have doubts, you can check your own site which has documentation and support: What can you do with Wireshark? According to its documentation on the official site, we cite some of the activities you can carry out. It is characterized by being very practical when carrying out analyzes about what is happening in our network and what security policies or measures to apply for safer performance.
It is a solution that exists since 1998 and thanks to the contribution of experts around the world, it is still in force and available to anyone who wishes to use it. Even the various educational institutions and the government can take advantage of this tool that has no cost. It can be used in both the private and corporate environment. It allows you to have complete control over what happens on the network to which you are connected at a very detailed level. It is one of the most popular and recommended network protocol analysis applications.
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