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[Python-Dev] XML DoS vulnerabilities and exploits in Python

Eli Bendersky eliben at gmail.com
Thu Feb 21 20:17:57 CET 2013 
On Thu, Feb 21, 2013 at 11:12 AM, Christian Heimes <christian at python.org>wrote:

> Am 21.02.2013 19:39, schrieb Eli Bendersky:
> > Just to clarify for my own curiosity. These attacks (e.g.
> > http://en.wikipedia.org/wiki/Billion_laughs) have been known and public
> > since 2003?
>
> Correct, see https://pypi.python.org/pypi/defusedxml#synopsis third
> paragraph. All XML attacks in my analysis are well known for years,
> billion laughs for about a decade.
>
> As far as I know it's the first time somebody has compiled and published
> a detailed list of vulnerabilities in Python's XML libraries. However
> I'm not the only one. OpenStack and Django were contacted by several
> people in the past few weeks, too.
>

Thanks, Christian. I think this should put the urgency of the fix into
context. While I agree that we should work on making future versions
resilient by default, I have doubts about the urgency of back-patching
existing, in-mainteinance-mode stable versions with something that's not
opt-in.

Eli
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