[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

Re: SAX characters event and external entities

sax characters limit
David Megginson <david@m...> writes:

> K. Ari Krupnikov writes:
>  > Would you report it as a (perhaps recoverable) error? Braking
>  > character data into multiple events would defy the purpose of this
>  > filter (to relieve content handlers from the need to do that
>  > themselves) and do nothing to solve the security issue.
> Here's an easy attack -- send you a start tag, then just keep sending
> random alphanumeric characters until your system chokes.  An arbitrary
> limit -- even a very high one, like a few gigabytes -- would be useful.

I see your point - introducing the potential for memory exhaustion in
an API that otherwise does not deal with memory allocation. But since
some memory will likely be allocated to store information from chunks
of the document (you can't always stream /everything/), you could as
easily choke my system by sending me empty start tags in the right
position in the document.

I did not originally have streaming applications with large character
content sections in mind. Thank you for pointing out a limit to this
filter's application domain -- I shall include it in the documentation.



Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!

Buy Stylus Studio Now

Download The World's Best XML IDE!

Accelerate XML development with our award-winning XML IDE - Download a free trial today!

Don't miss another message! Subscribe to this list today.
First Name
Last Name
Subscribe in XML format
RSS 2.0
Atom 0.3

Stylus Studio has published XML-DEV in RSS and ATOM formats, enabling users to easily subcribe to the list from their preferred news reader application.

Stylus Studio Sponsored Links are added links designed to provide related and additional information to the visitors of this website. they were not included by the author in the initial post. To view the content without the Sponsor Links please click here.

Site Map | Privacy Policy | Terms of Use | Trademarks
Free Stylus Studio XML Training:
W3C Member
Stylus Studio® and DataDirect XQuery ™are products from DataDirect Technologies, is a registered trademark of Progress Software Corporation, in the U.S. and other countries. © 2004-2013 All Rights Reserved.