bugIPQ BDB filter - Bugs: bug #56447, Verdict repetition

 
 

bug #56447: Verdict repetition

Submitter:  Alessandro Vesely <ale2003>
Submitted:  Thu 06 Jun 2019 07:54:59 AM UTC
   
 
Category:  None Severity:  3 - Normal
Item Group:  None Status:  Fixed
Privacy:  Public Assigned to:  ale2003
Open/Closed:  Closed
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Thu 06 Jun 2019 12:00:14 PM UTC, comment #1: 

v. 1.05

Alessandro Vesely <ale2003>
Group administrator
Thu 06 Jun 2019 07:54:59 AM UTC, original submission:  

For consistency, ibd-judge reiterates an NF_DROP judgment for IPQBDB_RECENT_DROP_TIME seconds, without tossing.  That behavior was provided to defeat automatic retries.  However, it turns out it can have nasty consequences if the remote host never gives up.

What happened: a user flunked login one year ago.  Even with a low probability (0.41%) the connection happened to be dropped.  Connection attempts went on at 17000+ times per second, totaling 90000+ times at the end of day.

The solution consists of a 32-bit counter to enforce a maximum of repetition without toss.

Alessandro Vesely <ale2003>
Group administrator

 

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    Date Changed by Updated Field Previous Value => Replaced by
    2019-06-06 ale2003 StatusIn Progress Fixed
        Open/ClosedOpen Closed

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