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CVE Request New-djbdns: dnscache: potential cache poisoning
From: P J P <ppandit () redhat com>
Date: Mon, 10 Feb 2014 13:04:48 +0530 (IST)


Please see -> https://00f.net/2012/06/26/dnscache-poisoning-and-siphash/

By exploiting a hash table collision, an attacker has no way to trigger a DoS, but he can actually do something way more interesting: force the resolver to send the same query for the same TLD, over and over again, always to the same set of servers, no matter what the intended TTL is and no matter what the cache size is.

And suddenly, poisoning dnscache with a malicious TLD much, much, much easier and faster.

Not sure if it qualifies for a CVE; the excerpt above deems it a likely candidate.

Upstream fix:
  -> https://github.com/pjps/ndjbdns/commit/16cb625eccbd68045737729792f09b4945a4b508

Thank you.
Prasad J Pandit / Red Hat Security Response Team

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