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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

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