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Category:   Application (Web Server/CGI)  >   IBM iNotes and Domino Vendors:   IBM
IBM Lotus Domino Bug in Processing vCal Meeting Requests Let Remote Users Deny Service
SecurityTracker Alert ID:  1016390
SecurityTracker URL:
CVE Reference:   CVE-2006-0119   (Links to External Site)
Date:  Jun 27 2006
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 6.5.4 FP1 and 6.5.5.
Description:   A vulnerability was reported in Lotus Domino. A remote user can cause denial of service conditions.

A remote user can send a specially crafted vCal meeting request via SMTP to cause the target routing server (nrouter.exe) to consume all available CPU resources. This will prevent delivery of all mail.

The affected mail must be removed from the queue to cause the system to return to normal operations.

Symantec reported this vulnerability.

[Editor's note: This vulnerability was original referenced by IBM in July 2005.]

Impact:   A remote user can cause denial of service conditions.
Solution:   IBM has issued a fix as part of 6.5.4 FP1, 6.5.5, and 7.0.

The vendor's notice is available at:

Vendor URL: (Links to External Site)
Cause:   Exception handling error
Underlying OS:  Linux (Any), OS/400, UNIX (AIX), UNIX (Solaris - SunOS), Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  SYMSA-2006-006: Lotus Domino SMTP Based Denial of Service

Hash: SHA1

                  Symantec Vulnerability Research
                        Security Advisory

Advisory ID    : SYMSA-2006-006
Advisory Title : Lotus Domino SMTP Based Denial of Service
Author         : Ollie Whitehouse (
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      :


        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

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


        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.

        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.


        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 (,
which standardizes names for security problems.


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

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Symantec Vulnerability Research Advisory Archive:

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

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Symantec Product Advisory PGP Key:

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

Copyright (c) 2006 by Symantec Corp.
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