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TUCoPS :: Windows Net Apps :: ciacj061.txt

Windows: Lotus Notes Domino Server DoS Attacks



                       The U.S. Department of Energy
                    Computer Incident Advisory Capability
                           ___  __ __    _     ___
                          /       |     /_\   /
                          \___  __|__  /   \  \___

                             INFORMATION BULLETIN
               Lotus Notes Domino Server Denial of Service Attacks

August 25, 1999 17:00 GMT                                         Number J-061
PROBLEM:        An overflow problem in the Notes LDAP Service (NLDAP).
PLATFORM:       Lotus Notes Domino Server 4.6.
DAMAGE:         An attacker could cause a denial of service.
SOLUTION:       Upgrade to Maintenance release 4.6.6 or 5.0.
VULNERABILITY   Risk is low because no data is lost and the system security
ASSESSMENT:     is not breached.

[  Start ISS Advisory  ]

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
<> 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 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 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: as
well as on MIT's PGP key server and's key server.

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

[  End ISS Advisory  ]


CIAC wishes to acknowledge Internet Security Systems, Inc. for the information
contained in this bulletin.

CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.

CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
    Voice:    +1 925-422-8193
    FAX:      +1 925-423-8002
    STU-III:  +1 925-423-2604

For emergencies and off-hour assistance, DOE, DOE contractor sites,
and the NIH may contact CIAC 24-hours a day. During off hours (5PM -
8AM PST), use one of the following methods to contact CIAC:

    1.  Call the CIAC voice number 925-422-8193 and leave a message, or

    2.  Call 888-449-8369 to send a Sky Page to the CIAC duty person or

    3.  Send e-mail to, or

    4.  Call 800-201-9288 for the CIAC Project Leader.

Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.

   World Wide Web:
                        (or -- they're the same machine)
   Anonymous FTP:
                        (or -- they're the same machine)
   Modem access:        +1 (925) 423-4753 (28.8K baud)
                        +1 (925) 423-3331 (28.8K baud)

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This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
legal liability or responsibility for the accuracy, completeness, or
usefulness of any information, apparatus, product, or process
disclosed, or represents that its use would not infringe privately
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otherwise, does not necessarily constitute or imply its endorsement,
recommendation or favoring by the United States Government or the
University of California. The views and opinions of authors expressed
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