[Catalyst] {OT] protecting against attacks with multilingual input

Daniel McBrearty danielmcbrearty at gmail.com
Tue Dec 5 14:05:15 GMT 2006

thanks people, this is very helpful. Well, everything is postgresql /
linux, so MSSQL will never be an issue.

Also I only ever use utf8 ... so I guess I'm home and dry. It would be
very neat to be able to do this without locale-switching (and

as a matter of interest, does anyone have a reference on why
placeholders protect against injection attacks ? If that is the case,
maybe I can even leave out \w filtering where that is appropriate to
do that.



On 12/5/06, Brandon Black <blblack at gmail.com> wrote:
> On 12/5/06, Daniel McBrearty <danielmcbrearty at gmail.com> wrote:
> > This is what I'm talking about. I don't know this technique - I
> > thought the only approach was to filter input. I'm using DBIx, AFAIK
> > it does use placeholders ... ? If so, I can just take input, do some
> > basic "sanity" filtering, and store?
> >
> Yes, DBIC does use placeholders in most situations.  However, the
> NoBindVars-based Storage classes do not.  This includes the notable
> example of MSSQL via DBD::Sybase, which uses NoBindVars to work around
> issues with FreeTDS and/or DBD::Sybase.  The only really good way to
> fix this is to fix the DBD's or underlying DB libraries to properly
> support bind variables in all cases.
> > Phaylon : sure. A simple example would be, say, a multilingual web
> > forum. A text field would have a size limit, but other than that most
> > any utf8 character could be input.
> If your encoding is utf-8, you'll read in the perl i18n/l10n docs that
> UTF-8 has universal definitions for \w, \W, etc.  Thus you don't
> really even need to know the language to safely validate for word vs
> non-word chars, just the encoding.
> -- Brandon
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Daniel McBrearty
email : danielmcbrearty at gmail.com
www.engoi.com : the multi - language vocab trainer
BTW : 0873928131

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