Date: Thu, 20 Feb 2014 09:01:33 -0500 (EST) From: cve-assign@...re.org To: ppandit@...hat.com Cc: cve-assign@...re.org, oss-security@...ts.openwall.com Subject: Re: CVE Request New-djbdns: dnscache: potential cache poisoning -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 > What do you mean not sufficient? It means that existence of an opportunity for security improvement is not sufficient for a CVE assignment. > How is it relevant that it was not well understood at the time when > software was written? It is still an issue. CVE is, in the context of this inclusion question, about software mistakes. Sometimes it is easy to identify a software mistake (e.g., off-by-one) and sometimes it is more difficult. If there's a software deficiency at the layer of algorithm choice, one of the relevant criteria is the context in which the software was originally developed. Without that, the entire history of software development could be reconsidered to assign CVE labels to development choices that would not have been made today. Typically, for algorithm choices, the "mistake" versus "not a mistake" question needs to be evaluated in the environment in which the software was written, not the environment in which the software is used. SipHash is a somewhat important advance in computing. There are many, many products that would be better in some way if SipHash were introduced. Typically, at the first level, the product would be better because it would be more resistant to DoS attacks. (We realize that the New-djbdns case is a little different because the DoS attack denies intended caching and indirectly facilitates a spoofing attack. It starts with the DoS against caching, however.) It seems impractical to assign CVE IDs for all opportunities to use SipHash in all products, or even for the relatively more important opportunities. Neither SipHash nor a reasonable equivalent existed when many products were developed. Because SipHash was unavailable, the product used alternative development choices that, in practice, may have opened the product to important threats. However, lack of use of SipHash was not a "mistake." Almost any product can be improved by addressing more classes of threats, but this does not establish that a mistake occurred. > Like the JSON library example earlier in this thread, or > > -> http://www.cvedetails.com/cve/CVE-2012-0770 > -> https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-4885 Those CVEs were based on announcements by vendors who were original authors of pieces of software. Our first reply already mentioned that those are an entirely separate case of CVE inclusion. > Please note that the CVE is requested for 'New-djbdns'. New-djbdns is > a fully fledged, production quality, fast growing fork Creation of a fork doesn't change the status of every development decision from historical to present-day. Otherwise, every "mistake" versus "not a mistake" question would need to be reevaluated every time anyone chooses to publish a fork. A very popular reason for creating a fork is that something is substantially wrong with the original product. It is common to see ways to make security improvements, as well as other improvements. Codebase relationships are, in general, a major complication for CVE. However, at this point, keeping "algorithm-choice improvement after a fork" outside the scope of CVE seems to be, on balance, the better alternative. - -- CVE assignment team, MITRE CVE Numbering Authority M/S M300 202 Burlington Road, Bedford, MA 01730 USA [ PGP key available through http://cve.mitre.org/cve/request_id.html ] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.14 (SunOS) iQEcBAEBAgAGBQJTBgp4AAoJEKllVAevmvmsZJwH/Az3nfxT3gwIKLXneQ8H3aLI eHX+Z9o09nJn/0tix/B1SbfENZi5uZ/PCvNJfrzS8M7jysfqeyVSgSL5Xm51yFZe slTmd9/dyzZw63JJwITeNsEBpVCNmsB/ucHrblTeYeYy4CUoB9/iNTlFSdkoj7x3 uhQrI9wt2hsF+dBeFyXOugdeg6PlGp9v8tS1IOhhiOaZiHyZSsff25NyGo4Z+7Hh 7KPOZJ+eEftkJ+w+xqohgJhvch7ivATfDGorEmPFy9VlpsW9PWnPulHSAm+hjC7y 3Z07N10rpQc/IvrTNribMHNK6SR5JbdVg3FsQStgldK4FoQKLrpjcesdapA0qRQ= =6xI0 -----END PGP SIGNATURE-----
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