Jim Fulton wrote:
Recently, a serious security flaw was found in Zope 2 due to it's
improper support for allowing reStructuredText to be edited
through-the-web. reStructuredText has directives that allow inclusion
of any file a Zope process could read and inclusion of data obtained
from fetching arbitrary URLs. In a trusted environment, these
directives have legitimate uses. The feature of including files and URL
results should not be enabled for text entered from untrusted sources,
which applies to most through-the-web interactions.
Hi Jim. In the case of a wiki, it is the nature of a wiki that folks are
able to edit through the web. Wouldn't data validation and any necessary
alterations to the directives some sense as opposed to removing it from
the zope3 mix?
The recent hotfix:
http://www.zope.org/Products/Zope/Hotfix-2006-07-05/Hotfix-2006-07-05
addresses the problem for Zope 2.
It is safe to allow reStructuredText through the web with care. The
inclusion of files or URL results can be disabled, but the programmer
must explicitly disable the feature. It is not disabled by default. It
is also critical that a developer who exposes through-the-web
reStructuredText have tests to verify that the file/url inclusion
feature has been disabled.
Zope 3 itself, as released, doesn't have this problem because it doesn't
allow reST entry through the web. There are third-party applications,
however, including 2 packages in the Zope 3 subversion tree that do have
this problem. I strongly urge you to avoid using any Zope package that
allows through-the-web input of reStructuredText unless you can verify
that file/url has been properly disabled.
The zwiki and bugtracker packages do not currently disable file/url
inclusion and should not be used in situations in which users who are
not highly trusted have access to these applications.
Can you be explicit about the process of disabling file/url inclusion
for zope3 (if this is the critical point you are making ). The use of
restructured text is valuable in zope and obviously it is important to
understand security measures that would allow its continued use.
If this can be done, why remove the products from the repository tree?
Would it not be better to apply the necessary fixes? Many thanks.
Regards,
David
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