Novell eDirectory Server Malformed Index Denial of Service Vulnerability

ID ZDI-10-189
Type zdi
Reporter 1c239c43f521145fa8385d64a9c32243
Modified 2010-11-09T00:00:00


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.