Date: 28 June 2006
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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
Operating System: Windows
Mac OS X
Impact: Denial of Service
CVE Names: CAN-2006-0119
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
Advisory ID : SYMSA-2006-006
Advisory Title : Lotus Domino SMTP Based Denial of Service
Author : Ollie Whitehouse (email@example.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
Lotus Domino is a client/server product designed for
collaborative working environments. Domino is designed
for e-mail, scheduling, instant messaging and data
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.
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 (http://cve.mitre.org),
which standardizes names for security problems.
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For questions about this advisory, or to report an error:
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Symantec Vulnerability Research Advisory Archive:
Symantec Vulnerability Research GPG Key:
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To Report a Security Vulnerability in a Symantec Product:
For general information on Symantec's Product Vulnerability
reporting and response:
Symantec Product Advisory Archive:
Symantec Product Advisory PGP Key:
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