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Internet Security Systems Security Brief
November 12, 2002
 
Multiple Remote Vulnerabilities in BIND4 and BIND8

Synopsis:
 
ISS X-Force has discovered several serious vulnerabilities in the Berkeley
Internet Name Domain Server (BIND). BIND is the most common implementation of
the DNS (Domain Name Service) protocol, which is used on the vast majority of
DNS servers on the Internet. DNS is a vital Internet protocol that maintains
a database of easy-to-remember domain names (host names) and their
corresponding numerical IP addresses.

Impact:
 
The vulnerabilities described in this advisory affect nearly all currently
deployed recursive DNS servers on the Internet. The DNS network is considered
a critical component of Internet infrastructure. There is no information
implying that these exploits are known to the computer underground, and there
are no reports of active attacks. If exploits for these vulnerabilities are
developed and made public, they may lead to compromise and DoS attacks against
vulnerable DNS servers. Since the vulnerability is widespread, an Internet
worm may be developed to propagate by exploiting the flaws in BIND. Widespread
attacks against the DNS system may lead to general instability and inaccuracy
of DNS data.

Affected Versions:

BIND SIG Cached RR Overflow Vulnerability

        BIND 8, versions up to and including 8.3.3-REL
        BIND 4, versions up to and including 4.9.10-REL

BIND OPT DoS

        BIND 8, versions 8.3.0 up to and including 8.3.3-REL

BIND SIG Expiry Time DoS

        BIND 8, versions up to and including 8.3.3-REL

For the complete ISS X-Force Security Advisory, please visit:
http://bvlive01.iss.net/issEn/delivery/xforce/alertdetail.jsp?oid=21469

______

About Internet Security Systems (ISS) Founded in 1994, Internet Security
Systems (ISS) (Nasdaq: ISSX) is a pioneer and world leader in software
and services that protect critical online resources from an ever-
changing spectrum of threats and misuse. Internet Security Systems is
headquartered in Atlanta, GA, with additional operations throughout the
Americas, Asia, Australia, Europe and the Middle East.

Copyright (c) 2002 Internet Security Systems, Inc. All rights reserved
worldwide.

Permission is hereby granted for the electronic redistribution of this
document. It is not to be edited or altered in any way without the
express written consent of the Internet Security Systems X-Force. If you
wish to reprint the whole or any part of this document in any other
medium excluding electronic media, please email xforceiss.net for
permission.

Disclaimer: The information within this paper may change without notice.
Use of this information constitutes acceptance for use in an AS IS
condition. There are NO warranties, implied or otherwise, with regard to
this information or its use. Any use of this information is at the
user's risk. In no event shall the author/distributor (Internet Security
Systems X-Force) be held liable for any damages whatsoever arising out
of or in connection with the use or spread of this information.

X-Force PGP Key available on MIT's PGP key server and PGP.com's key
server, as well as at http://www.iss.net/security_center/sensitive.php

Please send suggestions, updates, and comments to: X-Force
xforceiss.net of Internet Security Systems, Inc.

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