- Dota3: Is your Internet of Things device moonlighting?
- Remote Access Overview
- Block SSH Login Attack in Juniper SRX
- Accessing a Junos OS Device the First Time
- CLI Login to the Juniper device and different CLI modes.
Dota3: Is your Internet of Things device moonlighting?By Walter J. Goralski, Cathy Gadecki, Michael Bushong. The prompt shows the username you used to log in and the name of the device:. Because the device is shared on a network, you may want to send a message to all the other users who log in. One way to do so is to display a message on the screen each time someone logs in. This banner containing the message displays before or after the login prompt, depending on which command you use. After entering configuration mode, use the banner command set system login message to place your message before the login prompt. The n puts one blank line a new line after the text and before the login prompt:. If your company has legal requirements in place to limit access to key network devices, such as routers, you can use the login banner to warn that only certain people are allowed to work on the router. Be sure to use the specific language the legal department provides for the banner. Never welcome or otherwise encourage people to use the device in text you include in a banner. To make announcements for such things as network or router down time or for a scheduled network maintenance window, use the set system announcement command:. He has worked in the networking field for more than 40 years. Cathy Gadecki is coauthor of the first edition of Junos For Dummies.
Remote Access Overview
Dissecting the evolution of malware gives researchers insights into the knowledge of, and development processes used by, malware authors. Dota3, active in the wild, offers a unique opportunity to examine a strain of malware during what appears to be an intermediate stage between major versions. It was a simple device to allow the programmers to check if the machine was stocked, prior to them leaving their desks to retrieve a beverage. For how simple this device was, it was only a matter of time before computers became smaller and designers started incorporating these devices into more items as a matter of convenience. Like many innovations, ease of use, lower costs and convenience take precedence over security. In the last couple of decades, criminals have seized on this to make IoT devices work for their schemes. Now, these devices have become so prevalent and accepted that they appear in many homes. IoT devices are so much more capable that attackers have evolved their tactics from simple acts of vandalism to botnet incorporation, cryptocurrency mining and back-door installs. This combination of advanced computational capability and the notoriously lax security of IoT devices makes them a prime target for cybercriminals, especially those that wish to remain undetected. Among the families of malware that target IoT devices is Dota. Juniper Threat Labs monitors a number of devices, in order to keep an eye on the current state of malware, and here Dota quickly makes itself known. The Dota family of malware has used this attack vector in the past and continues to do so. While these attacks are problematic for any target, SSH attacks directed at root accounts are a particular concern for IoT devices. This is because many IoT devices are either left with the default configuration or have been hard coded with a username and password that the user can not even change, if the user knew how or wanted to. Dota, like any actively maintained software, continues to be developed and enhanced by its developers. While we did see Dota variants throughout the year, this was the first time Dota3 has been spotted by Juniper Threat Labs. The use of this variant has been steadily climbing since. Despite the increase in Dota3 adoption, it has not completely replaced the Dota or Dota2 variants that were previously used. Looking through the scripts provided below, it would appear this version is a work in progress. The attacker has not cleaned up certain code and even included incomplete scripts into the download. We do not know if this is a result of the origin of the bot being in Ireland or the majority of infected systems being in Ireland. The attackers appear to be using AWS, in many of the malware caches. These IPs are generally linked to websites that are not fully developed or maintained. Dota3 appears to be based on a botnet, attacking weak SSH servers using default credentials or reused passwords. It does not appear bruteforce, as these attacks are a scan across multiple IPs with the same password, suggesting there is a password list that the bot runs against. If the combination fails, we may not see the attacker again for hours or days. Analysis of the malware IPs used by Dota revealed that both
Block SSH Login Attack in Juniper SRX
By Walter J. Goralski, Cathy Gadecki, Michael Bushong. SSH differs from Telnet in that it enables the exchange of data between you and your device over a secure channel. You must explicitly enable the encrypted SSH service on the device:. After you enable SSH on the device, you can access the device through an encrypted session. Because this session is encrypted, you can now log in to the device remotely using the root login:. When you log into the device as rootyou log in directly to the FreeBSD shell. To start the CLI, issue the cli command at the prompt. A fairly simple way to help strengthen your device against attack is to limit the number of access sessions that can be attempted per minute. Use the rate-limit statement to limit the number of tries to something reasonable:. Although Telnet is the old-school original remote access method and it may hold a fond place in your heart, when it comes to accessing devices, Telnet can be fairly insecure. Unfortunately, this setup makes it fairly simple to sniff the traffic and steal logins and passwords. He has worked in the networking field for more than 40 years. Cathy Gadecki is coauthor of the first edition of Junos For Dummies.
Accessing a Junos OS Device the First Time
I can access with SSH,Telnet and web management from inside only. Go to Solution. Which zone are you coming in from? If you are coming in from the untrust zone, then based on your configuration, you will not be able to manage from untrust. You don't have host-inbound-traffic system services set for http. Add http to your host-inbound-traffic system-services for the untrust zone, or whichever zone you are coming in from, then try it again. When I use the guide below, I receive a syntax error on ssh. How do I get that? I really apologize; i know this should be basic stuff, but i can't find any useful documentation to figure stuff out like this how to get the config or do any type of configuration or explanation of what the options are. The spots to look at for this particular issue would be [edit system services], [edit security zones]. Either way, if you head to  and run save nameforconfig it will create a textfile in the directory of the user you're logged in with. I just tried from work and i can login successfully while i couldn't last night connecting to the same name at home on the same link. Given that this is a security device, it's going to toss out the traffic that it thinks is odd. Native Junos support is supposedly coming back it used to be there Thank you for the dyndns tip SRX Services Gateway. Sign In. Global Communities. Community Resources. Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Showing results for. Search instead for. Did you mean:. Everyone's tags 1 : basics. Message 1 of 19Views. All forum topics Previous Topic Next Topic. Re: how to configure SSH or web management to connected my Srx from outside? Message 2 of 19Views. Accepted by topic author suwandy. Message 3 of 19Views. Message 4 of 19Views.