Advisory Details

October 1st, 2010

Novell eDirectory Server Malformed Index Denial of Service Vulnerability

ZDI-10-189
ZDI-CAN-477

CVE ID
CVSS SCORE 7.8, (AV:N/AC:L/Au:N/C:N/I:N/A:C)
AFFECTED VENDORS Novell
AFFECTED PRODUCTS eDirectory
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 9971. For further product information on the TippingPoint IPS: 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 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:
http://www.novell.com/support/viewContent.do?externalId=7006389&sliceId=2
DISCLOSURE TIMELINE
  • 2009-04-28 - Vulnerability reported to vendor
  • 2010-10-01 - Coordinated public release of advisory
CREDIT 1c239c43f521145fa8385d64a9c32243
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