Novell eDirectory Server Malformed Index Denial of Service VulnerabilityZDI-10-189: October 1st, 2010
TippingPoint™ IPS Customer ProtectionTippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 9971. For further product information on the TippingPoint IPS:
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 ResponseNovell has issued an update to correct this vulnerability. More details can be found at:
2009-04-28 - Vulnerability reported to vendor
2010-10-01 - Coordinated public release of advisory
CreditThis vulnerability was discovered by: