Snort mailing list archives
Re: Homenet Question
From: Joel Esler <jesler () sourcefire com>
Date: Fri, 4 May 2012 18:12:33 -0400
Do you have a use for that preprocessor? If not, you can disable it. Check out the docs on the preprocessors at http://manual.snort.org or in the doc/ directory of the Snort Tarball. -- Joel Esler Sent from my.. NO ONE CARES On May 4, 2012, at 1:15 PM, "Gibson, Samuel" <gibsons () my uwstout edu> wrote:
I forgot to mention the Sensitive_data threshold exceeded alert (GID: 139 Sig: 1) that I assume gets triggered due to the amount of sensitive_data email alerts. Sorry if I should have made this another thread. ________________________________________ From: Gibson, Samuel [gibsons () my uwstout edu] Sent: Friday, May 04, 2012 12:08 PM To: snort-users () lists sourceforge net Subject: Re: [Snort-users] Homenet Question Thanks for your help. This is sort of a follow-on question. I have updated EXTERNAL_NET to !$HOME_NET and that seems to have helped with some of the rules but, am I correct in thinking it should stop the sensitive_data email alerts between internal resources and VPN clients? # alert tcp $HOME_NET any -> $EXTERNAL_NET [80,20,25,143,110] (msg:"SENSITIVE-DATA Email Addresses"; metadata:service http, service smtp, service ftp-data, service imap, service pop3; sd_pattern:20,email; classtype:sdf; sid:5; gid:138; rev:1;) I get loads of these due to a large volume of emails to VPN clients. ________________________________________ From: Gibson, Samuel [gibsons () my uwstout edu] Sent: Wednesday, May 02, 2012 4:40 PM To: snort-users () lists sourceforge net Subject: Re: [Snort-users] Homenet Question Thanks guys. I will try setting EXTERNAL_NET to !$HOME_NET. ________________________________________ From: Ian Bowers [iggdawg () gmail com] Sent: Wednesday, May 02, 2012 12:11 PM To: Adam Gardner Cc: Gibson, Samuel; snort-users () lists sourceforge net Subject: Re: [Snort-users] Homenet Question Alternately, if you have some reason for using "any" as EXTERNAL_NET, you can change the variable in the rule from EXTERNAL_NET to !$HOME_NET. If you use PulledPork, place this in modifysid.conf : 2009702 "$EXTERNAL_NET" "!$HOME_NET" However I imagine similar issue will come up in other rules. Adam's solution is probably the best way to go. -Ian On Wed, May 2, 2012 at 10:13 AM, Adam Gardner <adamgardner502 () gmail com<mailto:adamgardner502 () gmail com>> wrote: Since your $EXTERNAL_NET is set to "any" 10.0.0.0/8<http://10.0.0.0/8> is included in that. You'll probably want to set $EXTERNAL_NET to !$HOME_NET. On Wed, May 2, 2012 at 9:46 AM, Gibson, Samuel <gibsons () my uwstout edu<mailto:gibsons () my uwstout edu>> wrote: Hello, I am having an interesting issue with the homenet. I have it setup in snort.conf as follows: ipvar HOME_NET [10.0.0.0/8<http://10.0.0.0/8>] ipvar EXTERNAL_NET any ipvar DNS_Servers [10.1.2.3,10.1.2.4] Which we have subnetted into internal networks similar to 10.1.2.x, 10.2.3.x and so on. However our VPN clients use 10.1.20.x/24. Whenever a VPN Client registers itself in DNS after connecting, I get an ET POLICY DNS Update From External net (Gen 1 Sig 2009702) The rule triggers, for example, with a source of 10.10.20.10 and a destination of 10.1.2.3 I can suppress this, but am mostly wondering if anyone has any insight into why the VPN is not being considered part of HOMENET. Thanks, Sam ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net<mailto:Snort-users () lists sourceforge net> Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users Please visit http://blog.snort.org to stay current on all the latest Snort news! ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net<mailto:Snort-users () lists sourceforge net> Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users Please visit http://blog.snort.org to stay current on all the latest Snort news! ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users Please visit http://blog.snort.org to stay current on all the latest Snort news! ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users Please visit http://blog.snort.org to stay current on all the latest Snort news! ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users Please visit http://blog.snort.org to stay current on all the latest Snort news!
------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users Please visit http://blog.snort.org to stay current on all the latest Snort news!
Current thread:
- Homenet Question Gibson, Samuel (May 02)
- Re: Homenet Question Adam Gardner (May 02)
- Re: Homenet Question Ian Bowers (May 02)
- Re: Homenet Question Gibson, Samuel (May 02)
- Re: Homenet Question Gibson, Samuel (May 04)
- Re: Homenet Question Gibson, Samuel (May 04)
- Re: Homenet Question Joel Esler (May 04)
- Re: Homenet Question Ian Bowers (May 02)
- Re: Homenet Question Adam Gardner (May 02)