Re: Question about a security function

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On 20 May 2010 13:53, Al <news@xxxxxxxxxxxxx> wrote:
>
> I have a password-protected, user, on-line editor that I'm hardening against
> hackers just in case a user's pw is stolen or local PC is infected.
>
> The user can enter html tags; but, I restrict the acceptable tags to benign
> ones. e.g., <p>, <b>, <table>, etc.  e.g., no <embed... <script... etc.
>
> Just to be extra safe, I've added a function that parses for executables in
> the raw, entered text. If found, I post and nasty error message and ignore
> the entry altogether.

That's not really going to work. See:

http://ha.ckers.org/xss.html

Blacklisting is a fundamentally flawed approach. I suggest using
http://htmlpurifier.org/ instead.

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