Snort mailing list archives
Re: MSSQL False Neg
From: "Bill Scherr IV" <bschnzl () cotse net>
Date: Tue, 01 Dec 2009 21:37:51 -0500
Matt...
From a # snort -c <file> -T 2>&1 | less
gen-id=1 _ sig-id=3543 _ type=Threshold _ tracking=src _ count=5 _ seconds=2 So the thresholding is set. That seems a bit tight. This guy passes one packet every 2.25 seconds. IMHO, that passes for a brute force attempt. Granted this service should not be subjected to one of these attacks, but 2 to 3 attempts per second is kind of heavy. I shifted the threshold to 1800 seconds on my sensors. Thanks for your very well explained effort. B. Circa 19:14, 1 Dec 2009, a note, claiming source Matt Olney <molney () sourcefire com>, was sent to me: Date sent: Tue, 1 Dec 2009 19:14:57 -0500 Subject: Re: [Snort-sigs] MSSQL False Neg From: Matt Olney <molney () sourcefire com> To: Nigel Houghton <nhoughton () sourcefire com> Copies to: bschnzl () cotse net, snort-sigs () lists sourceforge net
The rule seems to be correct, I'm thinking there is a thresholding issue somewhere. Looking at it, it looks like it should alert if you see 5 packets in a 2 second period that match this rule. If you want to check the non-thresholding portion of the rule, try the following local rule:
Bill Scherr IV, GSEC, GCIA Principal Security Engineer EWA Information and Infrastructure Technologies bscherr () iit-tek com bscherr () ewa com 703-478-7608 ------------------------------------------------------------------------------ Join us December 9, 2009 for the Red Hat Virtual Experience, a free event focused on virtualization and cloud computing. Attend in-depth sessions from your desk. Your couch. Anywhere. http://p.sf.net/sfu/redhat-sfdev2dev _______________________________________________ Snort-sigs mailing list Snort-sigs () lists sourceforge net https://lists.sourceforge.net/lists/listinfo/snort-sigs
Current thread:
- MSSQL False Neg Bill Scherr IV (Dec 01)
- Re: MSSQL False Neg Alex Kirk (Dec 01)
- Re: MSSQL False Neg Bill Scherr IV (Dec 01)
- Re: MSSQL False Neg Nigel Houghton (Dec 01)
- Re: MSSQL False Neg Matt Olney (Dec 01)
- Re: MSSQL False Neg Matt Olney (Dec 01)
- Re: MSSQL False Neg Bill Scherr IV (Dec 01)
- Re: MSSQL False Neg Bill Scherr IV (Dec 01)
- Re: MSSQL False Neg Alex Kirk (Dec 01)
- Re: MSSQL False Neg Bill Scherr IV (Dec 01)