TippingPoint Zero Day Initiative

Novell eDirectory Malformed NCP Request Denial of Service Vulnerability

ZDI-11-060: February 7th, 2011


CVSS Score

Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 8275. 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. Novell's eDirectory Server binds to port 524 for processing NCP requests. When the application processes a malformed FileSetLock request, the service 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

    2009-03-26 - Vulnerability reported to vendor
    2011-02-07 - Coordinated public release of advisory


This vulnerability was discovered by: