ZDI-11-060: Novell eDirectory Malformed NCP Request Denial of Service Vulnerability

[ZDI Disclosures <zdi-disclosures@xxxxxxxxxxxxxxxx>]

ZDI-11-060: Novell eDirectory Malformed NCP Request Denial of Service 
Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-060

February 7, 2011

-- CVE ID:
CVE-2010-4327

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

-- Affected Vendors:
Novell

-- Affected Products:
Novell eDirectory

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 8275. 
For further product information on the TippingPoint IPS, visit:

    http://www.tippingpoint.com

-- 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:

http://www.novell.com/support/viewContent.do?externalId=7007781&sliceId=2

-- Disclosure Timeline:
2009-03-26 - Vulnerability reported to vendor
2011-02-07 - Public release of advisory

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

-- About the Zero Day Initiative (ZDI):
Established by TippingPoint, The Zero Day Initiative (ZDI) represents 
a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:

    http://www.zerodayinitiative.com

The ZDI is unique in how the acquired vulnerability information is
used. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
TippingPoint provides its customers with zero day protection through
its intrusion prevention technology. Explicit details regarding the
specifics of the vulnerability are not exposed to any parties until
an official vendor patch is publicly available. Furthermore, with the
altruistic aim of helping to secure a broader user base, TippingPoint
provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
mitigation product.

Our vulnerability disclosure policy is available online at:

    http://www.zerodayinitiative.com/advisories/disclosure_policy/

Follow the ZDI on Twitter:

    http://twitter.com/thezdi