The Azure Bastion service is a new fully platform-managed PaaS service that you provision inside your virtual network. It provides secure and seamless RDP/SSH connectivity to your virtual machines directly in the Azure portal over TLS. When you connect via Azure Bastion, your virtual machines do not need a public IP address.
Bastion provides secure RDP and SSH connectivity to all of the VMs in the virtual network in which it is provisioned. Using Azure Bastion protects your virtual machines from exposing RDP/SSH ports to the outside world, while still providing secure access using RDP/SSH. With Azure Bastion, you connect to the virtual machine directly from the Azure portal. You don't need an additional client, agent, or piece of software.
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Architecture
Azure Bastion deployment is per virtual network, not per subscription/account or virtual machine. Once you provision an Azure Bastion service in your virtual network, the RDP/SSH experience is available to all your VMs in the same virtual network.
RDP and SSH are some of the fundamental means through which you can connect to your workloads running in Azure. Exposing RDP/SSH ports over the Internet isn't desired and is seen as a significant threat surface. This is often due to protocol vulnerabilities. To contain this threat surface, you can deploy bastion hosts (also known as jump-servers) at the public side of your perimeter network. Bastion host servers are designed and configured to withstand attacks. Bastion servers also provide RDP and SSH connectivity to the workloads sitting behind the bastion, as well as further inside the network.
This figure shows the architecture of an Azure Bastion deployment. In this diagram:
The Bastion host is deployed in the virtual network.
The user connects to the Azure portal using any HTML5 browser.
The user selects the virtual machine to connect to.
With a single click, the RDP/SSH session opens in the browser.
No public IP is required on the Azure VM.
Key features
The following features are available:
RDP and SSH directly in Azure portal: You can directly get to the RDP and SSH session directly in the Azure portal using a single click seamless experience.
Remote Session over TLS and firewall traversal for RDP/SSH: Azure Bastion uses an HTML5 based web client that is automatically streamed to your local device, so that you get your RDP/SSH session over TLS on port 443 enabling you to traverse corporate firewalls securely.
No Public IP required on the Azure VM: Azure Bastion opens the RDP/SSH connection to your Azure virtual machine using private IP on your VM. You don't need a public IP on your virtual machine.
No hassle of managing NSGs: Azure Bastion is a fully managed platform PaaS service from Azure that is hardened internally to provide you secure RDP/SSH connectivity. You don't need to apply any NSGs on Azure Bastion subnet. Because Azure Bastion connects to your virtual machines over private IP, you can configure your NSGs to allow RDP/SSH from Azure Bastion only. This removes the hassle of managing NSGs each time you need to securely connect to your virtual machines.
Protection against port scanning: Because you do not need to expose your virtual machines to public Internet, your VMs are protected against port scanning by rogue and malicious users located outside your virtual network.
Protect against zero-day exploits. Hardening in one place only: Azure Bastion is a fully platform-managed PaaS service. Because it sits at the perimeter of your virtual network, you don’t need to worry about hardening each of the virtual machines in your virtual network. The Azure platform protects against zero-day exploits by keeping the Azure Bastion hardened and always up to date for you.
What's new?
Subscribe to the RSS feed and view the latest Azure Bastion feature updates on the Azure Updates page.
FAQ
Which regions are available?
Note
We are working hard to add additional regions. When a region is added, we will add it to this list.
When you connect to a VM using Azure Bastion, you do NOT need a public IP on the Azure Virtual Machine that you are connecting to. The Bastion service will open the RDP/SSH session/connection to your virtual machine over the private IP of your virtual machine, within your virtual network.
Is IPv6 supported?
At this time, IPv6 is not supported. Azure Bastion supports IPv4 only.
Do I need an RDP or SSH client?
You do not need an RDP or SSH client to access the RDP/SSH to your Azure virtual machine in your Azure portal. Use the Azure portal to let you get RDP/SSH access to your virtual machine directly in the browser.
Do I need an agent running in the Azure virtual machine?
You don't need to install an agent or any software on your browser or your Azure virtual machine. The Bastion service is agentless and does not require any additional software for RDP/SSH.
How many concurrent RDP and SSH sessions does each Azure Bastion support?
Both RDP and SSH are a usage-based protocol. High usage of sessions will cause the bastion host to support a lower total number of sessions. The numbers below assume normal day-to-day workflows.
Resource
Limit
Concurrent RDP connections
25*
Concurrent SSH connections
50**
*May vary due to other on-going RDP sessions or other on-going SSH sessions. **May vary if there are existing RDP connections or usage from other on-going SSH sessions.
What features are supported in an RDP session?
At this time, only text copy/paste is supported. Features such as file copy are not supported. Please feel free to share your feedback about new features on the Azure Bastion Feedback page.
Which browsers are supported?
Use the Microsoft Edge browser or Google Chrome on Windows. For Apple Mac, use Google Chrome browser. Microsoft Edge Chromium is also supported on both Windows and Mac, respectively.
Where does Azure Bastion store customer data?
Azure Bastion doesn't move or store customer data out of the region it is deployed in.
Are any roles required to access a virtual machine?
In order to make a connection, the following roles are required:
Reader role on the virtual machine
Reader role on the NIC with private IP of the virtual machine
Reader role on the Azure Bastion resource
What is the pricing?
For more information, see the pricing page.
Does Azure Bastion require an RDS CAL for administrative purposes on Azure-hosted VMs?
No, access to Windows Server VMs by Azure Bastion does not require an RDS CAL when used solely for administrative purposes.
What keyboard layouts are supported during the Bastion remote session?
Azure Bastion currently supports en-us-qwerty keyboard layout inside the VM. Support for other locales for keyboard layout is work in progress.
Is user-defined routing (UDR) supported on an Azure Bastion subnet?
No. UDR is not supported on an Azure Bastion subnet.For scenarios that include both Azure Bastion and Azure Firewall/Network Virtual Appliance (NVA) in the same virtual network, you don’t need to force traffic from an Azure Bastion subnet to Azure Firewall because the communication between Azure Bastion and your VMs is private. For more information, see Accessing VMs behind Azure Firewall with Bastion.
Why do I get 'Your session has expired' error message before the Bastion session starts?
A session should be initiated only from the Azure portal. Sign in to the Azure portal and begin your session again. If you go to the URL directly from another browser session or tab, this error is expected. It helps ensure that your session is more secure and that the session can be accessed only through the Azure portal.
How do I handle deployment failures?
Review any error messages and raise a support request in the Azure portal as needed. Deployment failures may result from Azure subscription limits, quotas and constraints. Specifically, customers may encounter a limit on the number of public IP addresses allowed per subscription that causes the Azure Bastion deployment to fail.
Next steps
Create an Azure Bastion host resource.
Learn about some of the other key networking capabilities of Azure.
Ransomware attacks don’t discriminate. They are just as happy targeting those with four legs as those with two.
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Anonymous sources told cybersecurity reporter Brian Krebs this week that National Veterinary Associates (NVA) has fallen victim to a ransomware attack that has affected hundreds of hospitals.
NVA describes itself as one of the largest veterinary pet care services organisations in the world. It partners with over 700 general practice veterinary hospitals, spanning general practice clinics, equine hospitals, and pet resorts in a network spanning the US, Canada, Australia, and New Zealand. Founded in 1996 by Dr. Stan Creighton, it began by buying hospitals from retiring veterinarians. It now has 2,600 veterinarians in its network.
Ryuk ransomware
NVA didn’t respond to our requests for comment, but reports said that the company discovered a ransomware attack on Sunday 27 October. The culprit was apparently Ryuk, an especially pernicious form of ransomware first detected by researchers in August 2018.
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According to sources quoted by Krebs, the ransomware hit nearly 400 hospitals in the company’s 700-strong network. The infection wasn’t ubiquitous because hospitals have some autonomy in how they run their IT networks, but some were left struggling to provide care after they lost access to their patient information management systems, reports said.
A source also told Krebs that this wasn’t the first Ryuk infection than the company has endured. The company had discussed the first attack more openly, the source said.
Things were different this time, according to Krebs. The company reportedly sent out instructions explaining how members of its network should discuss the incident. A screenshot read:
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Ryuk kills over 40 processes and stops more than 180 services on infected computers, including some anti-virus tools. It also writes itself to the Run registry key to maintain persistence. It has been involved in ransomware attacks against organizations including the Chicago Tribune and cloud hosting provider DataResolution.net.
In the UK, the National Cyber Security Centre (NCSC) is investigating Ryuk ransomware campaigns linked to Emotet and Trickbot. The Centre says that Ryuk is a targeted strain of ransomware that allows its owner to set the ransom according to the victim’s perceived ability to pay. It often operates under the radar for a period of time ranging up to months, enabling the attacker to move laterally through the network and infect as many assets as possible.
Krebs’ source expressed concern that NVA may not have completely eradicated the first attack.
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How to protect yourself from ransomware
Pick strong passwords. And don’t re-use passwords, ever.
Make regular backups. They could be your last line of defense against a six-figure ransom demand. Be sure to keep them offsite where attackers can’t find them.
Patch early, patch often. Ransomware like WannaCry and NotPetya relied on unpatched vulnerabilities to spread around the globe.
Lock down RDP. Criminal gangs exploit weak RDP credentials to launch targeted ransomware attacks. Turn off RDP if you don’t need it, and use rate limiting, 2FA or a VPN if you do.
Use anti-ransomware protection. Sophos Intercept X and XG Firewall are designed to work hand in hand to combat ransomware and its effects. Individuals can protect themselves with Sophos Home.
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For more advice, please check out our END OF RANSOMWARE page.