![]() The main danger is a rogue image trying to take control of your computer by a process escalation. This means the security level depends on the security of those technologies. GNS3 is a wrapper on proprietary and open source technologies. This means you can inject packet inside and exploit a security hole in a running image. Injection of packets into the virtual networks #ĭue to limitation of some emulators, the virtual network listens on all IPs. With physical equipment, this is the equivalent to having physical access to the console port of a device. It is not possible to prevent this, as GNS3 requires network access for certain use cases.Īlso when an emulator starts, often it will expose its console to the network via the same IP as the GNS3 server. To summarize if the GNS3 server process is compromised, it will have access to the entire filesystem.ĭepending on your computer configuration, or the topologies where you are running any appliances, it is possible to access to your physical network. This allows users to use images located in different locations of the file system. When the GNS3 server is run on a local computer, it has access to the entire filesystem. The server - by default when started by the GUI - is protected by an HTTP basic auth using a random password. The server is responsible for starting the emulators. The server is controlled via HTTP by the GUI. GNS3 is split into two parts: The GUI and a server. The whole development process is transparent, and you can follow it live on our repositories. GNS3 is open source and you can access the source code and audit it. It’s not possible to screen capture UAC prompts in Win7/Win 10 anymore, so an older example has been left in place for illustration purposes) Access to the source code # ![]() Windows versions are signed with a GNS3 certificate. Please do not use any third party download sites as they might inject malicious code into the installer. We also provide nightly build: but we recommend using stable releases. Also SolarWinds provide an official mirror: Download it from the official website or from our github. ![]() The project is partially run by volunteers in their free time, especially the publication of the packages on various distributions. Please give us some time to solve the issue before public publications. If you want to use PGP, you can also mail: If you find a security issue please report it to We try to limit that, but due to the nature of the experimentation running in GNS3 the gns3 server has powerful control on the account. The best is to consider that if someone has access to a running GNS3 server, he has access to the account where the server is running. ![]() The choice of making GNS3 useable without the need of a VM and multi platform offers a powerful solution to users even with low resources computers but increases the attack surface. This document aims to cover the possible attack vectors and security considerations every good administrator should consider before installing/using GNS3. Although our focus is not currently on application security, we do encourage contributions of this nature to the project, and understand this is an extremely important part of our the application’s development. We have prioritised making GNS3 as user friendly as possible, as opposed to hardening the application against every possible security threat. GNS3 is designed for allowing full control via the GUI. The demographic of GNS3 users is very broad, ranging from networking students, through to systems administrators in large corporations. Users of GNS3 need to bear in mind that it is a tool designed to be used for experimentation/learning, not for managing Virtual Machines or appliances in a production environment. Configure GNS3 to use an additional remote server.How to use applications with the GNS3 Web interface.Install an appliance from the GNS3 Marketplace.
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