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IPS Signatures

SMB Authorization Failure

 
Signature ID: 6255/0
Original Release:S2
Release:S612 (download)
Original Release Date:2001 February 02
Latest Release Date:2011 December 13
Default Enabled:False
Default Retired:True
Alarm Severity:Informational
Fidelity:100 

Description
This alarm triggers when a client fails Windows NTs (or Sambas) user authentication three or more consecutive times within a single SMB session. This indicates that the user does not have a valid account name or password, the user has forgotten the password, or a password guessing attack like NAT is being used against the server. This alarm will also trigger on multiple failures to access a Windows 95 share. Share level access disregards the provided username and only uses the provided password.

Recommended Filter
No recommended filters.

Benign Triggers
Users that have forgotten passwords may trigger this signature.

IntelliShield Alerts
IntelliShield ID Headline VersionCVSS ScoreLast Published
53Weak User and System Account Passwords12000 May 01 16:00 GMT

Download
To download this and other IPS update files, please go to Cisco Secure Software Download.
LEGAL DISCLAIMER
THE INFORMATION ON THIS PAGE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION CONTAINED HEREIN, OR MATERIALS LINKED FROM THE DOCUMENT, IS AT YOUR OWN RISK. INFORMATION IN THIS DOCUMENT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
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