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Re: Re: CVE Request - Zope / Plone: Multiple vectors corrected within 20121106 fix
From: Matthew Wilkes <matthew.wilkes () plone org>
Date: Fri, 09 Nov 2012 16:40:14 +0000

Hi all,

It looks like some of these can be CVE merged, e.g. 14 and 15, 1 and
5, can you confirm that these should not be merged?

Thanks for constructing this comprehensive table, but please do not
merge 14 and 15, or 1 and 5.

I agree. It's our opinion that these are distinct flaws, and we would prefer to keep them tracked independently.

CVE assignment by MITRE most often has merges when the available
information suggests one of these two situations:

   A. Flaw types that have been used for many years and are thought to
      be well understood. At present, a large fraction of our merges
      are for XSS, SQL injection, CSRF, buffer overflows, integer
      overflows, use-after-free issues, and directory traversal.
      However, a merge can occur correctly for any flaw type.

Indeed, we do like to keep similar flaws with very different causes separate, though. In the particular case of 1/5 and 14/15 we don't see any similarities, but in general we've tried hard here to request CVEs in a way that accurately reflects discrete vulnerabilities in the stack.

At this point in the history of CWE, a discloser's choice of the same
CWE identifier for two different bugs might not be a strong indication
that a CVE merge should occur.

The CWE dictionary is huge, I would very much appreciate any feedback anyone can give me on the appropriateness of my choices here. I have been working on a Plone specific CWE dictionary but it's slow going.

For example, some CVE consumers don't like situations in
which a vendor publishes multiple disclosure documents that explain
different aspects of the same CVE.

We will bow to your advice here. If you tell us that our merge recommendations are poor we will make sure that we don't issue multiple guidance documents in future. For now, our list reflects our best understanding of the CVE guidance documents.

14 and 15: One might argue that these are different because 14 is
about algorithmic complexity but 15 isn't.

Indeed, I did consider CWE-407 here, but 749 is one of our go-to choices as it's a common error in Zope. I think, if I had to come down one side or another, then 15 is complexity whereas 14 is allowing users to circumvent caching on an expensive function. They are both similar outcomes, in that they're expensive pages, but for very different reasons.

01 and 05: One might argue that these are different because 05 is
about incomplete security declarations but 01 isn't.

Indeed. Also, 05 is a AC:H Au:S whereas 01 is AC:L Au:N. 05 allows an escalation of privileges in the sandbox whereas 01 allows unauthorised authoring of code which happens to only ever be run in a higher privilege set. 01 is a write-once persistent single statement whereas 05 is an editable file with multiple statements available. The privilege set that 01 escalates to is the un-escalated set for 05.


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