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. 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. Read reviews and product information about Google Workspace. cd /usr/share/squirrelmail Then go to the config directory: cd config Now run one of the following commands to configure squirrelmail. The problem is in the Deliver_ with the initStream function that uses escapeshellcmd() to sanitize the sendmail command before executing it. Find the top-ranking alternatives to SquirrelMail based on 47100 verified user reviews. rpm q squirrelmail If squirrelmail is not installed on the system then install it through rpm: rpm ivh squirrelmail Now go to the squirrelmail directory, located in /usr/share. 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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