IBM Lotus Domino/Notes 'nldap.exe' Bug Lets Remote Users Deny Service
SecurityTracker Alert ID: 1015611|
SecurityTracker URL: http://securitytracker.com/id/1015611
(Links to External Site)
Date: Feb 11 2006
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|
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:
A remote user can cause the LDAP service to crash.|
The vendor has issued a fixed version (6.5.4 FP2, 6.5.5, 7.0.1), available at:|
Vendor URL: www-1.ibm.com/support/docview.wss?rs=463&uid=swg21229907 (Links to External Site)
Exception handling error|
|Underlying OS: Linux (Any), UNIX (AIX), UNIX (Solaris - SunOS), Windows (Any), z/OS|
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.
VI. VENDOR RESPONSE
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
VII. CVE INFORMATION
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 (http://cve.mitre.org), which standardizes names for
VIII. DISCLOSURE TIMELINE
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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