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Re: Malicious documents? (WAS: Interesting mailing list & a r

Miles Sabin wrote
> >
> > Hi Ron, prepare to be pleasantly surprised.  There is a standard
> > feature in SAX called
> > "http://xml.org/sax/features/external-parameter-entities", which
> > prevents the parser from reading any external entities - including
> > the external DTD subset.
> And the default is?

According to the SAX specification [1] the default is unspecified.  But if
validation is enabled, then is must be set to "true".

> > Not all SAX parsers support this feature, but many do (ours included).
> Which means that even if developers are aware that they ought to disable
> external entity retrieval, and are aware of how to do it, they have no
> guarantee that it'll actually happen.

Sure they do.  If the SAX parser they are using doesn't support the feature,
then they'll get an UnsupportedFeatureException when they try to set it.




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