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Category:   Application (Web Server/CGI)  >   IBM iNotes and Domino Vendors:   IBM
IBM Lotus Domino/Notes 'nldap.exe' Bug Lets Remote Users Deny Service
SecurityTracker Alert ID:  1015611
SecurityTracker URL:
CVE Reference:   CVE-2005-2712   (Links to External Site)
Date:  Feb 11 2006
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to versions 6.5.4 FP2, 6.5.5, 7.0.1
Description:   iDEFENSE reported a vulnerability in IBM Lotus Domino server. A remote user can cause denial of service conditions.

A remote user can send a specially crafted bind request with a long string to the LDAP service on the target system to trigger a NULL pointer dereference and cause 'nldap.exe' to crash.

The vendor was notified on August 23, 2005.

Sebastian Apelt discovered this vulnerability.

The original advisory is available at:

Impact:   A remote user can cause the LDAP service to crash.
Solution:   The vendor has issued a fixed version (6.5.4 FP2, 6.5.5, 7.0.1), available at:

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

Message History:   None.

 Source Message Contents

Subject:  iDEFENSE Security Advisory 02.10.06: IBM Lotus Domino Server LDAP

IBM Lotus Domino Server LDAP DoS Vulnerability

iDEFENSE Security Advisory 02.10.06
February 10, 2006


IBM Lotus Domino Server software provides messaging, calendaring and
scheduling capabilities on a variety of operating systems. More
information about the product is available from:


Remote exploitation of a denial of service vulnerability in IBM Corp.'s
Lotus Domino LDAP server allows attackers to crash the service, thereby
preventing legitimate access. iDEFENSE is currently unaware of exploits
for this vulnerability other than those maintained by iDEFENSE Labs.
Vendor patches for this iDEFENSE exclusive report are currently
unavailable. A workaround has been provided.

The problem specifically exists within the LDAP server "nldap.exe." When
sending a specially crafted bind request with a long string to the LDAP
server port (389), a NULL pointer dereference occurs, resulting in a
crash of the process.


Exploitation of this vulnerability allows unauthenticated remote
attackers to crash the LDAP service, thereby preventing legitimate
usage. This attack takes little resources to launch and can be repeated
to ensure that an unpatched computer is unable to recover even after the
administrator manually restarts the service.


iDEFENSE has confirmed the existence of this vulnerability in Lotus
Domino Server version 6.5.4. It is suspected that earlier versions of
Lotus Domino Server are also affected.


Employ firewalls, access control lists or other TCP/UDP restriction
mechanisms to limit access to systems and services. More specifically,
limit access to TCP port 389 on the LDAP server to only allow trusted
hosts to connect.


The vendor has addressed this issue in the following products:

 - IBM Lotus Notes/Domino 6.5.4 FP2
 - IBM Lotus Notes/Domino 6.5.5
 - IBM Lotus Notes/Domino 7.0.1
The vendor has published the following technote which details patching


The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CAN-2005-2712 to this issue. This is a candidate for inclusion in
the CVE list (, which standardizes names for
security problems.


08/23/2005  Initial vendor notification
08/23/2005  Initial vendor response
02/10/2006  Coordinated public disclosure


Sebastian Apelt is credited with the discovery of this vulnerability.

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Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDEFENSE. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically, please
email for permission.

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.
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