A Local File Include (LFI) vulnerability was discovered in pkg_mgr_install.php,
a part of the pfSense WebGUI, via the logfilename parameter.
The logfilename parameter on pkg_mgr_install.php in an AJAX request was used to
specify a file to read, ending in .txt. This file name was not sanitized or
restricted to a specific path.
An authenticated user sending a specially crafted POST request could read any
file on the filesystem with a name ending in '.txt'.