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TITLE:
ISC BIND Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA21752

VERIFY ADVISORY:
http://secunia.com/advisories/21752/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

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

DESCRIPTION:
Some vulnerabilities have been reported in BIND, which can be
exploited by malicious people to cause a DoS (Denial of Service).

1) An assertion error within the processing of SIG queries can be
exploited to crash either a recursive server when more than one
SIG(covered) Resource Record set (RRset) is returned or an
authoritative server serving a RFC 2535 DNSSEC zone where there are
multiple SIG(covered) RRsets.

2) An error within the handling of multiple recursive queries can be
exploited to trigger an INSIST failure by causing the response to the
query to arrive after all clients looking for the response have left
the recursion queue.

NOTE: According to the vendor, the vulnerabilities are likely not
exploitable in the 9.2.x branch. However, a patch has been provided.

SOLUTION:
Update to BIND 9.3.3rc2, BIND 9.3.2-P1, BIND 9.2.7rc1, or BIND
9.2.6-P1.
http://www.isc.org/index.pl?/sw/bind/

The vulnerabilities have also been fixed in BIND 9.4.0b2.

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

ORIGINAL ADVISORY:
http://www.isc.org/sw/bind/bind-security.php

OTHER REFERENCES:
US-CERT VU#697164:
http://www.kb.cert.org/vuls/id/697164

US-CERT VU#915404:
http://www.kb.cert.org/vuls/id/915404

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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