AUSCERT External Security Bulletin Redistribution
                ESB-1999.121 -- ISS X-Force Security Advisory
       Denial of Service Attack against Lotus Notes Domino Server 4.6
                              26 August 1999


ISS X-Force has released the following advisory concerning a vulnerability
in the Notes LDAP Service (NLDAP) where an ldap_search request with a
large amount of data can cause a PANIC in the Domino Server.  This
vulnerability may allow remote users to stop all Domino services running
on the affected server.

- --------------------------BEGIN INCLUDED TEXT--------------------


ISS Security Advisory
August 23, 1999

Denial of Service Attack against Lotus Notes Domino Server 4.6


Lotus Domino Server is an integrated messaging and web application
server. An attacker can crash the Lotus Notes Domino server and stop
e-mail and other services that Domino provides for an organization.


There is an overflow problem in the Notes LDAP Service (NLDAP); the
service that handles the LDAP protocol. This overflow is related to the
way that NLDAP handles the ldap_search request. By sending a large amount of
data to the parameter in the ldap_search request, an attacker can cause a
PANIC in the Domino Server. This will allow an attacker to stop all Domino
services running on the affected machine.

Affected Versions: Lotus Notes Domino server 4.6.

Recommended Action: Upgrade to Maintenance release 4.6.6 or 5.0.

Additional Information:

Information in this advisory was obtained by the research of Caleb Sima
<csima@iss.net> of the ISS X-Force. ISS X-Force would like to thank Lotus
Development Corporation for their response and handling of this


About ISS:

ISS leads the market as the source for e-business risk management
solutions, serving as a trusted security provider to thousands of
organizations including 21 of the 25 largest U.S. commercial banks and
more than 35 government agencies. With its Adaptive Security Management
approach, ISS empowers organizations to measure and manage enterprise
security risks within Intranet, extranet and electronic commerce
environments. Its award-winning SAFEsuite(r) product line of intrusion
detection, vulnerability management and decision support solutions are
vital for protection in today's world of global connectivity, enabling
organizations to proactively monitor, detect and respond to security
risks. Founded in 1994, ISS is headquartered in Atlanta, GA with
additional offices throughout the U.S. and international operations in
Australia/New Zealand, Belgium, France, Germany, Japan, Latin America and
the UK. For more information, visit the ISS Web site at www.iss.net or
call 800-776-2362.

Copyright (c) 1999 by Internet Security Systems, Inc.

Permission is hereby granted for the redistribution of this Alert
electronically.  It is not to be edited in any way without express consent
of the X-Force.  If you wish to reprint the whole or any part of this
Alert in any other medium excluding electronic medium, please e-mail
xforce@iss.net for permission.


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 with regard to this information. In no event shall the
author be liable for any damages whatsoever arising out of or in
connection with the use or spread of this information. Any use of this
information is at the user's own risk.

X-Force PGP Key available at: http://xforce.iss.net/sensitive.php3 as
well as on MIT's PGP key server and PGP.com's key server.

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

Version: 2.6.3a
Charset: noconv


- --------------------------END INCLUDED TEXT--------------------

This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content.  The decision to use any or all of this information is
the responsibility of each user or organisation, and should be done so in
accordance with site policies and procedures.

NOTE: This is only the original release of the security bulletin.  It will
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the original authors to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:


If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security

Internet Email: auscert@auscert.org.au
Facsimile:	(07) 3365 7031
Telephone:	(07) 3365 4417 (International: +61 7 3365 4417)
		AusCERT personnel answer during Queensland business hours
		which are GMT+10:00 (AEST).
		On call after hours for emergencies.

Version: 2.6.3i
Charset: noconv
Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key