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             AUSCERT External Security Bulletin Redistribution

 Novell eDirectory Server Malformed Index Denial of Service Vulnerability
                              4 October 2010


        AusCERT Security Bulletin Summary

Product:           Novell eDirectory
Publisher:         Zero Day Initiative
Operating System:  Windows
                   Linux variants
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade

Original Bulletin: 

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Novell eDirectory Server Malformed Index Denial of Service Vulnerability

ZDI-10-189: October 1st, 2010

CVSS Score

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

Affected Vendors


Affected Products


TippingPoint IPS Customer Protection TippingPoint IPS customers are protected
against this vulnerability by Digital Vaccine protection filter ID 9971. For 
further product information on the TippingPoint IPS:


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 server. 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:


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