From: Secunia Security Advisories (sec-advsecunia.com)
Date: Tue Jul 24 2007 - 16:17:09 CDT

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TITLE:
BIND Predictable DNS Query IDs Vulnerability

SECUNIA ADVISORY ID:
SA26152

VERIFY ADVISORY:
http://secunia.com/advisories/26152/

CRITICAL:
Moderately critical

IMPACT:
Spoofing

WHERE:
From remote

SOFTWARE:
ISC BIND 9.4.x
http://secunia.com/product/14101/
ISC BIND 9.3.x
http://secunia.com/product/4298/
ISC BIND 9.2.x
http://secunia.com/product/75/

DESCRIPTION:
Amit Klein has reported a vulnerability in BIND, which can be
exploited by malicious people to poison the DNS cache.

The vulnerability is caused due to predictable query IDs in outgoing
queries (e.g. if BIND works as resolver or when sending NOTIFYs to
slaves) and can be exploited to poison the DNS cache when the query
ID is guessed.

Reportedly, the chance to guess the next query ID for 50% of the
queries (if the query ID is even) is 1 to 8.

The vulnerability is reported in the following versions:
* BIND 9.0 (all versions)
* BIND 9.1 (all versions)
* BIND 9.2.0, 9.2.1, 9.2.2, 9.2.3, 9.2.4, 9.2.5, 9.2.6, 9.2.7, 9.2.8
* BIND 9.3.0, 9.3.1, 9.3.2, 9.3.3, 9.3.4
* BIND 9.4.0, 9.4.1
* BIND 9.5.0a1, 9.5.0a2, 9.5.0a3, 9.5.0a4, 9.5.0a5

SOLUTION:
Update to BIND 9.2.8-P1, BIND 9.3.4-P1, BIND 9.4.1-P1.

PROVIDED AND/OR DISCOVERED BY:
Amit Klein

ORIGINAL ADVISORY:
ISC:
http://www.isc.org/index.pl?/sw/bind/bind-security.php

Tusteer:
http://www.trusteer.com/docs/bind9dns_s.html

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