Add Open-FTPD 1.2 Writable Directory Traversal Execution

Add Open-FTPD 1.2 Writable Directory Traversal Execution

    Homepage: http://sourceforge.net/projects/open-ftpd/
    Tested on 1.2 (Windows XP SP3) (EN)

![Open-FTPD 1.2 Writable Directory Traversal Execution](https://f.cloud.github.com/assets/434827/944874/8de48218-02e3-11e3-920f-dbddb0e16a7f.png)