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Re: Javascript injection

From Aleksandro <aleksandro@gmx.com>
Newsgroups comp.lang.javascript
Subject Re: Javascript injection
Date 2016-08-30 16:35 -0300
Organization A noiseless patient Spider
Message-ID <nq4n62$hjg$1@dont-email.me> (permalink)
References <2a5cf91a-151b-4379-9510-5dcd5a5bb196@googlegroups.com> <fof8sbd9g2sg3ll5lf232fkd4oapjdvrth@4ax.com> <XnsA673AEAA339D3eejj99@194.109.6.166>

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On 29/08/16 12:10, Evertjan. wrote:
> Hans-Georg Michna <hans-georgNoEmailPlease@michna.com> wrote on 29 Aug
> 2016 in comp.lang.javascript: 
> 
>> On Sun, 28 Aug 2016 22:58:08 -0700 (PDT),
>> bit-naughty@hotmail.com wrote:
>>
>>> If I have a "forum" type of site, where stuff is being posted, and
>>> stored in the backend (in a MySQL database, using PHP), say,....can
>>> anyone type in Javascript into the post to accomplish naughty things?
>>> What's the most nefarious thing anyone can do? All I can think of is
>>> that someone would deface the page somehow, that *that* post is on,
>>> which, really, I can't see the point of..... Anything else? ...and how
>>> do I protect against it? (the post will probably be displayed inside a
>>> DIV on the page, I think....) 
>>
>> I would not even allow ordinary users to enter HTML tags, i.e.
>> have them filtered out. This, of course, includes <script ...>
>> tags, so users cannot inject any script.
> 
> theText = theText.replace(/</g,'&lt;');

Serversidely OT: http://php.net/str_replace

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Thread

Javascript injection bit-naughty@hotmail.com - 2016-08-28 22:58 -0700
  Re: Javascript injection "Christoph M. Becker" <cmbecker69@arcor.de> - 2016-08-29 11:27 +0200
  Re: Javascript injection Hans-Georg Michna <hans-georgNoEmailPlease@michna.com> - 2016-08-29 15:58 +0200
    Re: Javascript injection "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2016-08-29 17:10 +0200
      Re: Javascript injection Aleksandro <aleksandro@gmx.com> - 2016-08-30 16:35 -0300
        Re: Javascript injection "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2016-08-31 10:25 +0200
          Re: Javascript injection "Christoph M. Becker" <cmbecker69@arcor.de> - 2016-08-31 12:43 +0200

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