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AusCERT Update AU-2006.0024 - [Win][UNIX/Linux]
Lotus Domino SMTP Based Denial of Service
28 June 2006

        AusCERT Update Summary
        ----------------------

Product:              Lotus Domino 6.5.4 and prior without FP1
Publisher:            Symantec
Operating System:     Windows
                      Linux variants
                      AIX
                      Mac OS X
                      OS/390
                      OS/400
Impact:               Denial of Service
Access:               Remote/Unauthenticated
CVE Names:            CAN-2006-0119

Ref:                  AA-2006.0001

Original Bulletin:    
  http://www.symantec.com/enterprise/research/SYMSA-2006-006.txt

Comment: This advisory provides further details on one of the vulnerabilities
         reported previously in AA-2006.0001.
         
         An external attacker can potentially stop Domino email delivery
         within the organisation by sending a malformed message from outside.

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                  Symantec Vulnerability Research
                  http://www.symantec.com/research
                        Security Advisory

Advisory ID    : SYMSA-2006-006
Advisory Title : Lotus Domino SMTP Based Denial of Service
Author         : Ollie Whitehouse (ollie_whitehouse@symantec.com)
Release Date   : June 27, 2006
Application    : Lotus Notes / Domino
Platform       : Multiple supported platforms.
Severity       : Remote Denial-of-Service
Vendor status  : IBM has resolved this issue in Domino 6.5.4 FP1,
                 6.5.5 and 7.0
CVE Candidate  : CAN-2006-0119
Reference      : http://www.securityfocus.com/bid/18020

Overview:

        Lotus Domino is a client/server product designed for
        collaborative working environments. Domino is designed
        for e-mail, scheduling, instant messaging and data
        driven applications.

        There exists a Denial-of-Service condition within
        NROUTER when parsing meeting requests. The result of
        which is that no external or internal mail will be
        delivered during the processing of the malformed
        message.

        This attack can be triggered from the Internet via
        standard mail protocols.

Details:

        When a malformed meeting request (vCal) is sent to a
        Lotus Domino based host via SMTP the routing server
        (nrouter.exe) will consume 100% of the CPU.

        In Symantec's testing on an Intel PIII with 256MB of
        RAM, 24 hours of procesing did not clear the message.
        Shutting down the server and restarting it does not
        resolve the problem due to the message remaining in
        the mail queue. The result of which is that the server
        returns to consuming 100% of the CPU.

        As stated above all e-mail functionality on the server
        will be disabled while the message is being processed.
  
Vendor Response:

        This issue was reported as 'SPR# KSPR699NBP' and has
        been resolved in Domino 6.5.4 FP1, 6.5.5 and 7.0. For
        more information, please see technote #1211952.

        www.ibm.com/support/docview.wss?rs=475&uid=swg21211952

        IBM recommends that instances of Domino are upgraded
        to at least 6.5.4 FP1, 6.5.5 or 7.0 in order to ensure
        this vulnerability is mitigated.

Recommendation:

        Follow your organization's testing procedures before
        applying patches or upgrading software.  See IBM's
        instructions as to which versions of Domino resolve
        this Denial-of-Service vulnerability.


Common Vulnerabilities and Exposures (CVE) Information:

The Common Vulnerabilities and Exposures (CVE) project has
assigned the following names to these issues.  These are
candidates for inclusion in the CVE list (http://cve.mitre.org),
which standardizes names for security problems.

        CAN-2006-0119

- - -----Symantec Vulnerability Research Advisory Information-----

For questions about this advisory, or to report an error:
research@symantec.com

For details on Symantec's Vulnerability Reporting Policy:
http://www.symantec.com/research/Symantec-Responsible-Disclosure.pdf

Symantec Vulnerability Research Advisory Archive:
http://www.symantec.com/research/

Symantec Vulnerability Research GPG Key:
http://www.symantec.com/research/Symantec_Vulnerability_Research_GPG.asc

- - -------------Symantec Product Advisory Information-------------

To Report a Security Vulnerability in a Symantec Product:
secure@symantec.com

For general information on Symantec's Product Vulnerability
reporting and response:
http://www.symantec.com/security/

Symantec Product Advisory Archive:
http://www.symantec.com/avcenter/security/SymantecAdvisories.html

Symantec Product Advisory PGP Key:
http://www.symantec.com/security/Symantec-Vulnerability-Management-Key.asc

- - ---------------------------------------------------------------

Copyright (c) 2006 by Symantec Corp.
Permission to redistribute this alert electronically is granted
as long as it is not edited in any way unless authorized by
Symantec Consulting Services. Reprinting the whole or part of
this alert in any medium other than electronically requires
permission from cs_advisories@symantec.com.

Disclaimer
The information in the advisory is believed to be accurate at the
time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS
condition. There are no warranties with regard to this information.
Neither the author nor the publisher accepts any liability for any
direct, indirect, or consequential loss or damage arising from use
of, or reliance on, this information.

Symantec, Symantec products, and Symantec Consulting Services are
registered trademarks of Symantec Corp. and/or affiliated companies
in the United States and other countries. All other registered and
unregistered trademarks represented in this document are the sole
property of their respective companies/owners.
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