The idea is to be able to run plugin code at given places in the SquirrelMailĬore. (SquirrelMail or a plugin) may be upgraded independently without risk of one Settings should be possible to add as plugins. Functionality likeĬhanging user passwords, displaying ads or calendars, and managing spam ![]() New features without having to patch SquirrelMail itself. The plugin architecture of SquirrelMail is designed to make it possible to add Plugin on the SquirrelMail web site that almost does what you want toĭo, please inquire with its author and/or the SquirrelMail team aboutĮnhancing it with your ideas. That contain similar feature sets should be merged and authors should workĬollaboratively instead of duplicating each others' efforts. Plugins is to avoid the "Firefox Syndrome", wherein it can take hours forĪn administrator to find the right plugin to suit a single need. That is simple to install and maintain, the team's philosophy regarding SquirrelMail community can provide feedback and help refine the idea beforeĪdditionally, in keeping with the SquirrelMail theme of providing a product It is alsoĮxtremely helpful to announce your intentions in public so that the Team if anyone has already attempted to implement the idea. Of a new plugin (for public consumption at least) is to ask the SquirrelMail Therefore, the first thing to be done before considering the development Relate to that kind of enthusiasm, but we also don't want to see it go to To "SquirrelMail can do." The SquirrelMail team can appreciate and One of the most enjoyable parts of programming is seeing an idea turn intoĪ working product - the transition from "what if SquirrelMail could do." To SquirrelMail, this is the best place to start. The SquirrelMail team would like to encourageĪuthors to contribute in the best way possible, which is what the following ![]() It is also thanks to the many plugin authors that have contributed largeĪmounts of code and a wide array of functionality ideas that SquirrelMail Technology behind it has also been borrowed for other projects. This is one of the main reasons cited when users andĪdministrators explain SquirrelMail as their webmail of choice, and the SquirrelMail is built with an ingenious and powerful system that allowsĪdd-ons known as plugins to extend its feature set in almost infiniteĭirections. 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 Developer's Manual: Developing plugins Next Previous Contents 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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