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Date: Wed, 14 Aug 2013 02:04:46 -0400
From: Roee Hay <>
Subject: Subverting BIND's SRTT Algorithm: Derandomizing
	NS Selection


BIND is exposed to a new vulnerability which can be exploited remotely
in order to derandomize the name server selection algorithm.
Exploitation of this vulnerability can be used in conjunction with
other off-path DNS cache poisoning exploits in order to make them more
efficient. ISC has acknowledged the vulnerability and plans to address
this deficiency by re-implementing the SRTT algorithm in future
maintenance releases of the BIND 9 code.

Important links:

1. Whitepaper:
2. Slides:
3. Blog post:
4. ISC's Operational Notification:


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