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Category:   Application (Directory)  >   Novell eDirectory Vendors:   Novell
Novell eDirectory NCP Over IP and evtFilteredMonitorEventsRequest() Overflows Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1017104
SecurityTracker URL:
CVE Reference:   CVE-2006-4177, CVE-2006-4509, CVE-2006-4510   (Links to External Site)
Date:  Oct 23 2006
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 8.8.1
Description:   iDefense reported several vulnerabilities in Novell eDirectory. A remote user can execute arbitrary code on the target system.

The NCP over IP implementation contains a heap overflow [CVE-2006-4177].

The evtFilteredMonitorEventsRequest() function contains an integer overflow [CVE-2006-4509].

The evtFilteredMonitorEventsRequest() function does not properly free allocated memory [CVE-2006-4510].

A remote user can send specially crafted data to trigger execute arbitrary code on the target system.

The vendor was notified on August 16 and 17, 2006.

Joshua J. Drake of iDefense Labs discovered the memory free error.

Impact:   A remote user can execute arbitrary code on the target system.
Solution:   The vendor has issued a fixed version (8.8.1 FTF1).



The Novell advisories are available at:

[Editor's note: The advisories were not yet publicly available at the time of this entry.]

Vendor URL: (Links to External Site)
Cause:   Boundary error, State error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  iDefense Security Advisory 10.21.06: Novell eDirectory NCP over IP

Novell eDirectory NCP over IP length Heap Overflow Vulnerability

iDefense Security Advisory 10.21.06
Oct 21, 2006


Novell eDirectory is a cross-platform lightweight directory access
protocol (LDAP) server. In addition to LDAP, eDirectory also implements
NCP over IP.  More information can be obtained from the Novell's web
site at


Remote exploitation of a heap overflow vulnerability in Novell Inc.'s
eDirectory product could allow an attacker to execute arbitrary code in
the context of the running daemon.

This vulnerability specifically exists within the NCP functionality of
eDirectory.  A specially crafted packet will cause eDirectory to read a
user specified amount of user supplied data into a static sized heap
buffer.  The NCP engine does not verify that the supplied data will fit
inside the allocated heap buffer bounds.  As such, a heap buffer
overflow Curr's.


Successful exploitation of this vulnerability could allow an attacker to
crash the server or execute arbitrary code. No credentials are required.
Typically this daemon runs with administrator privileges.


iDefense has confirmed the existence of this vulnerability in version
8.8.1 of Novell Inc.'s eDirectory server. Version 8.8 was also tested
and found to be vulnerable. Earlier versions are suspected to be


iDefense is unaware of any effective workaround for this issue.


Novell has addressed this vulnerability with eDirectory 8.8.1 FTF1.

You can obtain the Linux/Unix version of this update from their site at:
The windows version of this update is available at:

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2006-4177 to this issue. This is a candidate for inclusion in
the CVE list (, which standardizes names for
security problems.


08/16/2006  Initial vendor notification
08/17/2006  Initial vendor response
10/06/2006  Second vendor notification
10/20/2006  Vendor update released
10/21/2006  Public disclosure


The discoverer of this vulnerability wishes to remain anonymous.

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Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
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There are no warranties with regard to this information. Neither the
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