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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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