Date: Tue, 28 Jul 2015 20:13:13 +0100 From: Kiall Mac Innes <kiall@...innes.ie> To: cve-assign@...re.org CC: oss-security@...ts.openwall.com Subject: Re: CVE Request - OpenStack Designate mDNS DoS through incorrect handling of large RecordSets -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On 28/07/15 19:57, cve-assign@...re.org wrote: >> https://launchpad.net/bugs/1471161 > >> Designate does not enforce the DNS protocol limit concerning >> record set sizes > >> As a result, the rendering loop in desginate-mdns can does not >> make progress > >> Because it keeps receiving data, it does not seem it will ever >> run into a timeout (and if it does, it will try again). > >> https://bugs.launchpad.net/designate/+bug/1471161/comments/5 > >> I think there is 2 parts to this bug: > >> 1: Quotas were being bypassed as part of the v1 API. 2. If there >> was enough RRs in a RRSet MiniDNS went into a loop. 3. MiniDNS >> does not have a timeout. > > Our current feeling is that it is best to have two CVE IDs: one > for the original "does not enforce the DNS protocol limit > concerning record set sizes" issue and one for the "Quotas were > being bypassed" issue. Is that OK? Yes, this is OK. > [SNIP] > > We feel that item 3, adding a timeout, can be considered a > security enhancement opportunity that should not have its own CVE > ID, i.e., there is no report of a vulnerability that can be fixed > only with a timeout. Agreed. > Finally, our understanding is that multiple names are being used to > refer to the general > https://wiki.openstack.org/wiki/Designate/Blueprints/MiniDNS > concept, i.e., we think "MiniDNS does not have a timeout" is an > observation about the Designate codebase, not a third-party DNS > server such as from the https://code.google.com/p/minidns/ site. > Also, we think this part of the Designate codebase is also called > designate-mdns (misspelled as desginate-mdns) and mDNS -- these are > essentially alternative names for Designate MiniDNS. > Interesting, https://code.google.com/p/minidns/ is project I've not seen before. Within OpenStack Designate, we typically refer to the `designate-mdns` service as either MiniDNS or mDNS, we will need to ensure we're clearer in our wording in future to avoid any possible confusion. Thanks, Kiall -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAEBCAAGBQJVt9RIAAoJEHuWgzsGpgIa4igIAL4eiWoGF9ca5Cw4nlmQqZoe ZNnDJCI9JnAj87FOj7wVep8mM1RvD6dSmyfKeixp6ounAMCtaVoOtQa2oF+Gxqk0 A3nAgRCKWMKr6awmlN5FClLoX8oHg88iIOv8hE45RqjUaXat1dHvPog1YBxN6Ud0 Sx/IOaCWKHJIi/wJdwmNLbIP573tFhL0Hfw+m6AIiuRL495F7Umvqdb1nMHR/wfl /bwiTwfX3yD0q/kZAEZux23zBCOZEv24C9ups6LEP5un2G0w8P97VQdGDRhzddls EQstl/2gxR6yOPWV9f4MFxeVlEohHT5MZ5gvNio+7zzCJC5T9kSHGHDoe00LV5c= =BHnN -----END PGP SIGNATURE-----
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