![]() Please refer to this KB Article to apply the patches using SanerNow. Successful exploitation of this vulnerability could allow an attacker to execute arbitrary commands. Some other examples of attack vectors includes using commands like curl to fetch a malicious website or using tail -f to follow a log file containing some malicious content. Exploitation is not limited to this scenario only, the flaw can also be triggered using command-line utilities by tricking them into printing attacker-controlled content. The vulnerability is identified with CVE-2019-9535 and resides in the tmux integration feature of iTerm2 allowing an attacker to execute arbitrary commands on affected system.Ī proof-of-concept video is available from Mozilla which shows, how connecting to a malicious SSH server can result in running of an arbitrary command. If you are one of those devs who uses the terminal a lot and ends up with way too many tabs open, or practices pair programming, then this post is for you.ITerm2 is one of the most popular macOS terminal emulator and is a default choice for developers and administrators due to its extensive features like windows transparency, full-screen mode, notifications, integration with tmux etc.Ī critical remote code execution vulnerability has been discovered in iTerm2 by Radically Open Security, as part of an independent security audit funded by the Mozilla Open Source Support Program (MOSS). ![]() ![]() During the last months, I’ve started using Tmux a lot. Since I’ve found it to be very useful, I thought I would write a post where I share a few recommendations and pro-tips. I’ll show you what Tmux is and how to use it in combination with Vim to make a more effective and elegant use of the Terminal. And a very neat pair programming featureĪ few extras to enhance the Tmux experience.Īn important thing to bear in mind, this is the tool stack I had installed while writing this post, I tested what I say here with these versions.Tmux is a tool that allows running multiple terminal sessions through a single terminal window. It allows you to have terminal sessions running in the background and attach and detach from them as needed, which is very useful. – Bottom-right: the current date How to install Tmux? In Mac OS: – Bottom-middle: the current Tmux windows (“app log”, “editor” and “shell”) – Bottom-left: the Tmux session name (“pomodoro-app”) Later on, we will see how to make the most out of that feature. $ sudo apt-get install tmux The Tmux prefix ITERM TMUX INTEGRATION HOW TO In order to isolate its own keyboard shortcuts from other shortcuts, Tmux provides a shortcut prefix. When you want to trigger a Tmux shortcut you will press the Tmux prefix and then the Tmux shortcut key. The prefix that Tmux uses by default is Ctrl-b (“Ctrl” key in combination with the “b” key). If you have not already mapped the ctrl key to the caps-lock key and vice-versa I suggest you do it.Ĭalling ctrl from the caps-lock key is very practical.For instance, let’s say you want to trigger the shortcut that lists the current Tmux sessions, which is the s key. This is because when coding you need to call ctrl very frequently. I recommend changing the Tmux prefix to Ctrl-a.Moreover, it is a lot easier/quicker given the caps-lock key aligns with the default position of your fingers in the keyboard. Here is what you need to add in your ~/.nf file to change the prefix to Ctrl-a: Once the Ctrl key has been set to the caps-lock key, it gets a lot easier/quicker to call Ctrl-a instead of Ctrl-b, because the new prefix keys are very close to each other on the keyboard. This way, once you have added a new change to the ~/.nf file, just press ctrl-b R to reload your configuration without having to open a new Tmux session. Quick note: the screenshot shown here may differ slightly from what you see by default when you install Tmux. This is because I modified the status bar. If you want to do the same follow the steps on the “ Pimp your Tmux bar” section of this post.
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