http://nikos.no-ip.org/cgi-bin/index.pl/?select=../../cgi-bin/index.pl
+%00

[download]
Is there a way to avoid the above? Icant understand this becaus i sue the following code: 
my $passage = param('select') || "Αρχική
+ Σελίδα!";
Encode::from_to($passage, "utf8", "ISO-8859-7") if param();


if ( param('select') )
{
    open(FILE, "<../data/text/$passage.txt") or die $!;
         local $/;
         $data = <FILE>;
    close(FILE);

[download]
There is a .txt suffic after the variable $passage so the null byte injection shouldn't work.
Why does it work?

In reply to How to avoid Null Byte Injection? by Nik

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.