SYMSA-2006-006: Lotus Domino SMTP Based Denial of Service Jun 26 2006 08:42PM
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Symantec Vulnerability Research

Security Advisory

Advisory ID : SYMSA-2006-006

Advisory Title : Lotus Domino SMTP Based Denial of Service

Author : Ollie Whitehouse (ollie_whitehouse (at) symantec (dot) com [email concealed])

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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For details on Symantec's Vulnerability Reporting Policy:

Symantec Vulnerability Research Advisory Archive:

Symantec Vulnerability Research GPG Key:

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

To Report a Security Vulnerability in a Symantec Product:

secure (at) symantec (dot) com [email concealed]

For general information on Symantec's Product Vulnerability

reporting and response:

Symantec Product Advisory Archive:

Symantec Product Advisory PGP Key:

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

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 (at) symantec (dot) com. [email concealed]


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

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