![]() You can then send or check emails from that interface just like you would do from an email client like Ms Outlook or Thunderbird. Then, just enter your username and password associated with your email account and you will be able to login to the SquirrelMail dashboard. You can visit your SquirrelMail application using the address ‘If the setup was completed without a problem, you should see this login page: We can run the command below one more time to ensure the permissions are updated on the directory: $ sudo chown -R www-data:www-data /var/www/html/mail Step 5: Open SquirrelMail on your browser The data directory is created by default once you install SquirrelMail but we need to create the attachments directory using the command below: $ sudo /var/www/html/mail/attach/ Once you are done, press CTRL + X, Y and Enter to save the changes Remember to replace ‘’ with the domain name of your website. $attachment_dir = '/var/www/html/mail/attach/' We need to set the values below: $domain = '' ![]() We need to copy this file to config.php using the command below: $ sudo cp /var/Next we need to edit the file using nano editor to make a few changes: $ sudo nano /var/www/html/mail/config/config.php SquirrelMail has a default configuration file ( ‘config_default.php’). In order for Apache to be able to interact with SquirrelMail without read/write problems, we should set the right directory and file ownership permissions using the command below: $ sudo chown -R www-data:www-data /var/www/html/mail Step 4: Configure SquirrelMail We then move the content of the ‘squirrelmail-webmail-1.4.22’ directory to the root of our website: $ sudo mv squirrelmail-webmail-1.4.22/ /var/www/html/mail Step 3: Set the right directory permissions Then, we need to unzip the SquirrelMail archive file using the command below: $ sudo unzip squirrelmail-webmail-1.4.22.zip Next, enter the command below to download SquirrelMail $ wget Step 2: Unzip the archive file and copy it to the root of your websiteįirst, let us install the unzip tool on our Ubuntu 18.04 server: $ sudo apt-get install unzip We need to download this using the ‘wget’ command.įirst, cd to the ‘/tmp’ folder by typing the command below: $ cd /tmp Step 1: Download the latest version of SquirrelMailīy the time of writing this guide, the latest version of squirrelmail was version 1.4.22. Visit HostAdvice’s Best email hosting services page for reviews, prices and features. Special Note: you may want to inquire on email hosting options as well. In this guide, we focus on the steps for installing SquirrelMail on your Ubuntu 18.04 server and separate emails accounts for your employees, they can check and send emails from a browser through SquirrelMail. It is a complete solution for managing emails in a multi-user environment.įor instance, if you have a domain name (e.g. SquirrelMail is written in PHP and works pretty well in an Apache server running on Ubuntu 18.04 VPS. For exploitation, the attacker must upload a sendmail.cf file as an email attachment, and inject the sendmail.cf filename with the -C option within the "Options > Personal Informations > Email Address" setting.SquirrelMail is a web-based email client that supplements desktop software for sending and retrieving emails from an SMTP (Simple Mail Transfer Protocol) and IMAP (Internet Message Access) Protocol. ![]() Hence, if the target server uses sendmail and SquirrelMail is configured to use it as a command-line program, it's possible to trick sendmail into using an attacker-provided configuration file that triggers the execution of an arbitrary command. The problem is in -f$envelopefrom within the sendmail command line. The use of escapeshellcmd() is not correct in this case since it doesn't escape whitespaces, allowing the injection of arbitrary command parameters. The problem is in the Deliver_ with the initStream function that uses escapeshellcmd() to sanitize the sendmail command before executing it. ![]() It's possible to exploit this vulnerability to execute arbitrary shell commands on the remote server. ![]() SquirrelMail 1.4.22 (and other versions before 20170427_0200-SVN) allows post-authentication remote code execution via a sendmail.cf file that is mishandled in a popen call. ![]()
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