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Category:   Application (Directory)  >   Novell eDirectory Vendors:   Novell
Novell eDirectory Index Error in NCP Service Lets Remote Users Deny Service
SecurityTracker Alert ID:  1024499
SecurityTracker URL:
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Oct 4 2010
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 8.8.5 ftf4
Description:   A vulnerability was reported in Novell eDirectory. A remote user can cause denial of service conditions.

A remote user can send specially crafted data to the target NCP service on TCP port 524 service to trigger an index error and cause the service to become unresponsive. As a result, users will not be able to authenticate to the server.

The vendor was notified on April 28, 2009.

* 1c239c43f521145fa8385d64a9c32243 reported this vulnerability via TippingPoint's Zero Day Initiative.

Impact:   A remote user can cause the NCP service to become unresponsive, preventing users from authenticating to the system.
Solution:   The vendor has issued a fix (8.8.5 ftf4).

The vendor's advisory is available at:

Vendor URL: (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Red Hat Enterprise), Linux (SuSE), UNIX (AIX), UNIX (HP/UX), UNIX (Solaris - SunOS), Windows (2000), Windows (2003)

Message History:   None.

 Source Message Contents

Subject:  ZDI-10-189: Novell eDirectory Server Malformed Index Denial of Service Vulnerability

ZDI-10-189: Novell eDirectory Server Malformed Index Denial of Service Vulnerability
October 1, 2010

-- CVSS:
7.8, (AV:N/AC:L/Au:N/C:N/I:N/A:C)

-- Affected Vendors:

-- Affected Products:
Novell eDirectory

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 9971. 
For further product information on the TippingPoint IPS, visit:

-- Vulnerability Details:
This vulnerability allows attackers to deny services on vulnerable
installations of Novell eDirectory. Authentication is not required in
order to trigger this vulnerability.

The flaw exists within Novell's eDirectory Server's NCP implementation
which binds, by default, to TCP port 524. While handling a malformed
request, the application explicitly trusts a field when translating it
to an index into a table of counters. If this index is too large, the
application will set a value outside the array and the ndsd process will
become unresponsive resulting in an inability to authenticate to that

-- Vendor Response:
Novell has issued an update to correct this vulnerability. More
details can be found at:

-- Disclosure Timeline:
2009-04-28 - Vulnerability reported to vendor
2010-10-01 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * 1c239c43f521145fa8385d64a9c32243

-- About the Zero Day Initiative (ZDI):
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disclosing discovered vulnerabilities.

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