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Vigil@nce - BIND: denial of service via DNSSEC Key

November 2015 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An attacker can query BIND for a domain containing a malformed DNSSEC key, to force an assertion error in buffer.c, in order to trigger a denial of service.

Impacted products: Debian, BIG-IP Hardware, TMOS, Fedora, FreeBSD, HP-UX, BIND, openSUSE, Solaris, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Severity: 2/4.

Creation date: 03/09/2015.

DESCRIPTION OF THE VULNERABILITY

The BIND product can be configured with DNSSEC.

In this case, when this client queries BIND for information about a domain, the BIND server validates the DNSSEC key of this domain. However, when this key is malformed, an assertion error occurs in the buffer.c file because developers did not except this case, which stops the process.

This vulnerability impacts recursive DNS servers. This vulnerability impacts authoritative servers, only when an attacker can control a zone served by this server.

An attacker can therefore query BIND for a domain containing a malformed DNSSEC key, to force an assertion error in buffer.c, in order to trigger a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/B...




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