Public Vulnerability Reports

Novell GroupWise Messenger nmma.exe DoS Vulnerability



Novell Messenger is a corporate, cross-platform instant messaging
product that is based on Novell eDirectory. More information is
available at the following site:


Remote exploitation of a DoS vulnerability in Novell Inc.'s GroupWise
Messenger could allow attackers to crash the Messenger server.

The vulnerability specifically exists due to improper handling of a an
HTTP POST request with a modified 'val' paramater. When such a request
is received, a NULL pointer dereference occurs, leading to a crash of
the service.


Successful exploitation of this vulnerability would result in the server
crashing, rendering it unusable until it is restarted. Further
exploitation does not appear possible. In order to exploit this
vulnerability, an attacker must send a specially constructed HTTP
request to the server on TCP port 8300.


iDefense has confirmed this vulnerability in Novell GroupWise Messenger
version 2. All previous versions are suspected vulnerable.


iDefense is currently unaware of any effective workarounds for this


Novell has released updates in the form of Hot Patches. More
information on the security update can be found via the following link.


The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2006-4511 to this issue. This is a candidate for inclusion in
the CVE list (, which standardizes names for
security problems.


08/17/2006 Initial vendor notification
08/18/2006 Initial vendor response
10/02/2006 Coordinated public disclosure


CIRT.DK is credited with the discovery of this vulnerability.

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Copyright © 2006 Verisign, Inc.

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