Re: Extended ASCII characters used for injection

[john s <rwnin.security () gmail com>]

On Tue, Oct 19, 2010 at 8:06 AM, Nibbler <enibbler () gmail com> wrote:
> I have a web app and I want to block special characters in URL on the
> web server. Do you know if there is a risk of injection (XSS...) with
> extended ASCII char (%7f-%ff)?
> Is there any reason to block these characters?

Whether or not there is a known attack vector in the character-set, it
is a good practice to enumerate & allow only what you need
(whitelisting) rather than trying to define and block badness
(blacklisting)...



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