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Vigil@nce - BIND: denial of service via DNSSEC Trust Anchor

March 2015 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker can invite BIND to perform a DNSSEC validation, in
order to trigger a denial of service.

Impacted products: Debian, Fedora, FreeBSD, BIND, MBS, Ubuntu

Severity: 2/4

Creation date: 19/02/2015

DESCRIPTION OF THE VULNERABILITY

The BIND product can be configured to perform DNSSEC validation,
with "dnssec-validation auto;" or "dnssec-lookaside auto;".

However, an assertion error occurs when BIND validates a Trust
Anchor, with:
 a key which was previously trusted but now flagged as revoked
 when there are no other trusted keys available
 when there is a standby key, but it is not trusted yet

An attacker can therefore invite BIND to perform a DNSSEC
validation, in order to trigger a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/BIND-denial-of-service-via-DNSSEC-Trust-Anchor-16215


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