Date: Wed, 6 Jul 2016 12:10:19 +0200 From: Florian Weimer <fweimer@...hat.com> To: oss-security@...ts.openwall.com Subject: Malicious primary DNS servers can crash secondaries It turns out that most DNS server implementations do not implement reasonable restrictions for zone sizes. This allows an explicitly configured primary DNS server for a zone to crash a secondary DNS server, affecting service of other zones hosted on the same secondary server. Some references: https://lists.dns-oarc.net/pipermail/dns-operations/2016-July/015058.html https://lists.dns-oarc.net/pipermail/dns-operations/2016-July/015075.html https://gitlab.labs.nic.cz/labs/knot/merge_requests/541 https://www.nlnetlabs.nl/bugs-script/show_bug.cgi?id=790 PowerDNS is reportedly affected as well, but I did not find a public bug for this issue. Florian
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