I have to maintain an old cgi application that for whatever reason the boss doesn't want to upgrade to a modern frame work. The dilemma is we got hit my a security scan and we are susceptible to xss attacks. How do I protect against that in cgi. What I have done so far to curb the bleeding is I've added a regex to top of script that looks for words in url script, onload,cookie,mouse,document and a few others that I will never use in the url. But that is just a stop gap. Is there anything I can further do to protect against this attack. https://www.mysite.com?store="><script>alert('Gotcha!')</script>&aisle=">AA&prod=456&color=">8 The url is encoded %22%3E%3Cscript%3Ealert but that doesn't work. Any help would be appreciated.

In reply to XSS Protection in cgi application by newperldeveloper

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.