Config files : Undocumented feature: changing the visual display of the code

The application uses special characters that change the display order of bidirectional text. With these control characters some parts of the text can be displayed from left to right and others from right to left. Normally such control characters can be used, for example, to insert lines in Hebrew or Arabic into a file with code. However, if one uses these characters to combine lines with different text direction in one line, the right-to-left text snippets can override the regular left-to-right text.

This method allows to add to the code a malicious construction, which can be invisible during review.