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Date: Wed, 28 Oct 2009 00:02:40 +0000
From: Tim Brown <>
Subject: Handling cases of CWE-776


How are problems with XML bombs (the so called "billion laughs" attack) being 
handled?  Should I be filing such bugs against the applications that exposes 
the XML parser to user input or is it better to report the issue against the 
parser themselves.  For example, the test case I've prepared for one affected 
parser simply causes the CPU to spin but the system appears to stay 
responsive (so far ;)).  Is it even fair to call such a denial of service? 
(If the code was executed in a real application, no further processing would 
happen within the affected process as the parser is tied up in memmove()s).  
I'm just curious as I don't want to waste peoples time with the disclosure 
process if others are simply filing "standard" bugs against affected parsers 
and moving on to more interesting matters.

Tim Brown

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