Snort mailing list archives
Re: historical rule information?
From: "Miller - CDLE, Michael" <michael.miller () state co us>
Date: Thu, 18 Apr 2013 11:25:52 -0600
Thanks Patrick, I'm beginning to think it's a false positive. The top destinations are all Akamai in nature, and I'm beginning to think there's something specific about the originating site that's causing the alert. We're providing internet access to a couple dozen recipients of similar size, and this is the only one generating that traffic. On Thu, Apr 18, 2013 at 10:57 AM, Patrick Mullen <pmullen () sourcefire com>wrote:
Michael, Thank you for your query. That rule is known to have issues with false positives so it is not enabled in any default policies, which means it is disabled by default. The proper replacement for this alert is from a preprocessor, which has more contextual information surrounding the event that is possible within the rule -- 129:15:1 Reset outside window (That is sid 15 of preprocessor 129, Stream5). Regarding your statement "There are two ISA servers on that network, and they've been patched according to the KB article referenced in the rule detail, but the alerts are still being generated," the rule has no way of knowing that your servers are patched. This is part of tuning your IDS policy -- if you know your servers are not susceptible to this three year old attack, disable the rule to improve performance and reduce unnecessary alerts. Thanks, ~Patrick On Thu, Apr 18, 2013 at 11:55 AM, Miller - CDLE, Michael <michael.miller () state co us> wrote:I'm hunting down a rule that's generating a LOT of traffic on our network and was wondering if there were a wiki or history of rules to see whatthethinking was behind them. Specifically, I'm alerting on [3:15474:5] BAD-TRAFFIC Microsoft ISA Server and Forefront ThreatManagementGateway invalid RST denial of service attempt [Classification: Attempted Denial of Service] There are two ISA servers on that network, and they've been patched according to the KB article referenced in the rule detail (http://technet.microsoft.com/en-us/security/bulletin/MS09-016), but the alerts are still being generated.------------------------------------------------------------------------------Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs forbuildingapps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis & visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter _______________________________________________ Snort-sigs mailing list Snort-sigs () lists sourceforge net https://lists.sourceforge.net/lists/listinfo/snort-sigs http://www.snort.org Please visit http://blog.snort.org for the latest news about Snort!-- Patrick Mullen Response Research Manager Sourcefire VRT
-- *Michael Miller* *Network Security Engineer - SECOPS* * * Governor's Office of Information Technology Office of Information Security<http://www.colorado.gov/cs/Satellite/OIT-Cyber/CBON/1249667675596> 633 17th st, Suite 800 Denver, Co 80202 Office (303)318-8317 Cell (720)308-0795 ** How am I doing? ** ** Please contact my manager, jonathan.trull () state co us for comments or questions. **
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Current thread:
- historical rule information? Miller - CDLE, Michael (Apr 18)
- Re: historical rule information? Patrick Mullen (Apr 18)
- Re: historical rule information? Miller - CDLE, Michael (Apr 18)
- Re: historical rule information? Patrick Mullen (Apr 18)