Snort 2.9.4.1 pkg v.2.5.8
-
thanks Bill for your answer…but its weird, if I disable Snort on the LAN interface, those log entries stop and only return if I enable Snort on the LAN interface again.
-
So to sum up my answer to your question, if had 2GB or more of RAM and not a lot of load (say less than 50 Mbits/sec) with a reasonably modern CPU; then I would just run the default preprocessor setup on both interfaces.
Thank you Bill for your clear and concise reply. Snort has jumped in leaps and bounds since you started contributing and adding to Ermal's package. ;D
-
I have no choice with referring to torrent or p2p blocking 2with snort. With current version, without blocking the client who is downloading using torrent software. Not much can be done as the client kept continue downloading the file without failure. I have try it with my notebook , even though snort manage to block some external IP (using both LAN and WAN setting) , my torrent software keep continue downloading as nothing blocking it at all.
I do understand that with the setting I intended to used , my client or some workstation will be accidentally block(if they forgot to shut off their torrent software. But it sort like reminder to the client not to use torrent software in my network. After all with cron , it will only block for 5 min. So the client must make sure their pc is according to my requirement within 5 minute.
Really appreciate if the whitelist issue can be settle.
Thanks for the new snort interface.
Ok , my problem is…..
Base on my understanding with snort blocking capabilities
LAN setting - I can block both LAN@internal and External IP with selection of new whitelist setting which i have uncheck the "Add firewall Local Networks to the list (excluding WAN)." option. Block setting "both"
WAN setting - I can block external setting , wth default whitelist setting. Block setting "both"Both LAN and WAN setting will have different categories selection base on my need and requirement.
For the above setting , I manage to
WAN Setting - block external IP
LAN Setting - block only external IP (supposely to block both internal@LAN ip and external IP)When I view the whitelist IP with "view list" function , in the new whitelist setting, the local IP still there , sort nothing happened with the uncheck action I have done?
Bug? or I missed something?
4 am here, since yesterday morning, I will need to have some rest first. Really appreciate if any one can advice me the next action.
I went back and looked at the code. Currently it is by design that the interface Snort is running on (except when it's the WAN) is always added to HOME_NET and the WHITELIST. Do you really want to block your local LAN IP addresses? If so, why? You can easily lock yourself out of the firewall this way (at least lock out a workstation). It has always been the behavior of Snort to add the interface running Snort to HOME_NET and the WHITELIST. What changed in this last update was instead of whitelisting the entire WAN subnet, only the WAN IP is whitelisted. The checkbox just adds all the other locally attached firewall networks to HOME_NET and the WHITELIST. Formerly these were not added by default.
Bill
-
I have no choice with referring to torrent or p2p blocking 2with snort. With current version, without blocking the client who is downloading using torrent software. Not much can be done as the client kept continue downloading the file without failure. I have try it with my notebook , even though snort manage to block some external IP (using both LAN and WAN setting) , my torrent software keep continue downloading as nothing blocking it at all.
I do understand that with the setting I intended to used , my client or some workstation will be accidentally block(if they forgot to shut off their torrent software. But it sort like reminder to the client not to use torrent software in my network. After all with cron , it will only block for 5 min. So the client must make sure their pc is according to my requirement within 5 minute.
Really appreciate if the whitelist issue can be settle.
I can make the change, but I have to figure out a way to incorporate it so it does not break existing settings for folks who do not want to use it in the same manner. I will put this on the To-Do list for the next release. I will alter the WHITELIST so the Local Networks (including the interface Snort is running on) are not automatically included when the new Checkbox is cleared.
In the meantime, I can show you how to modify the default behavior on your system if you will PM (Private Message) me.
Bill
-
thanks Bill for your answer…but its weird, if I disable Snort on the LAN interface, those log entries stop and only return if I enable Snort on the LAN interface again.
OK, I will do a little research and see if something pops up. I don't use IPv6 on my systems yet, so I have never seen this traffic.
Bill
-
I have no choice with referring to torrent or p2p blocking 2with snort. With current version, without blocking the client who is downloading using torrent software. Not much can be done as the client kept continue downloading the file without failure. I have try it with my notebook , even though snort manage to block some external IP (using both LAN and WAN setting) , my torrent software keep continue downloading as nothing blocking it at all.
I do understand that with the setting I intended to used , my client or some workstation will be accidentally block(if they forgot to shut off their torrent software. But it sort like reminder to the client not to use torrent software in my network. After all with cron , it will only block for 5 min. So the client must make sure their pc is according to my requirement within 5 minute.
Really appreciate if the whitelist issue can be settle.
I can make the change, but I have to figure out a way to incorporate it so it does not break existing settings for folks who do not want to use it in the same manner. I will put this on the To-Do list for the next release. I will alter the WHITELIST so the Local Networks (including the interface Snort is running on) are not automatically included when the new Checkbox is cleared.
In the meantime, I can show you how to modify the default behavior on your system if you will PM (Private Message) me.
Bill
Thanks will PM you now
-
thanks Bill for your answer…but its weird, if I disable Snort on the LAN interface, those log entries stop and only return if I enable Snort on the LAN interface again.
OK, I will do a little research and see if something pops up. I don't use IPv6 on my systems yet, so I have never seen this traffic.
Bill
No worries Bill, I got the firewall to stop logging IPv6 multicast, no need to look into this, thanks
-
No worries Bill, I got the firewall to stop logging IPv6 multicast, no need to look into this, thanks
OK. I never did find any connection in my Google research between SSDP and Snort. There is one possibility, though, that just occurred to me. Snort puts the interface it is running on in promiscuous mode. Perhaps that is why you suddenly started seeing the traffic when Snort was enabled on the interface.
Just not logging it should be fine.
Bill
-
Just posting to confirm that the blank page problem has been resolved.
Thank you ;D
-
The new gui is very nice. The viewing of the whitelist defaults was very helpful in making sure it was getting the list that I wanted to make sure something important didn't get blocked.
Nice job!
-
I am getting a bunch of unimportant alerts on the LAN from an ipv6 address (it is actually a dhcp solicit request to port 547). This is the first time putting an ipv6 address in the suppression list so I don't know if this is new behavior or not. I have already upgraded all my installations to 2.5.8 package but I have a feeling older packages have the same issue though.
06/14/13 15:15:37 2 Attempted Information Leak fe80::344b:2f8a:dc36:80e5 ff02::c 122:23 (portscan) UDP Filtered Portsweep
I tried adding the ipv6 address to suppress fe80::344b:2f8a:dc36:80e5 ff02::c but it gets written to the interface suppression file incorrectly which causes snort to not start up…
#(portscan) UDP Filtered Portsweep
suppress gen_id 122, sig_id 23, track by_src, ip fe80::344b:2f8a:dc36:80e5I really don't want to ignore the scan completely. I would just modify the suppression file directly but it will get overwritten on the next time the suppression file gets written to disk.
UPDATE: Even if I manually edit the suppresion file for the interface the gui seems to overwrite it with the corrupt line when I try even starting the snort instance on that interface. It was worth a try anyway.
-
I am getting a bunch of unimportant alerts on the LAN from an ipv6 address (it is actually a dhcp solicit request to port 547). This is the first time putting an ipv6 address in the suppression list so I don't know if this is new behavior or not. I have already upgraded all my installations to 2.5.8 package but I have a feeling older packages have the same issue though.
06/14/13 15:15:37 2 Attempted Information Leak fe80::344b:2f8a:dc36:80e5 ff02::c 122:23 (portscan) UDP Filtered Portsweep
I tried adding the ipv6 address to suppress fe80::344b:2f8a:dc36:80e5 ff02::c but it gets written to the interface suppression file incorrectly which causes snort to not start up…
#(portscan) UDP Filtered Portsweep
suppress gen_id 122, sig_id 23, track by_src, ip fe80::344b:2f8a:dc36:80e5I really don't want to ignore the scan completely. I would just modify the suppression file directly but it will get overwritten on the next time the suppression file gets written to disk.
UPDATE: Even if I manually edit the suppresion file for the interface the gui seems to overwrite it with the corrupt line when I try even starting the snort instance on that interface. It was worth a try anyway.
Thanks for reporting. That definitely looks like a bug. I will get it fixed and included in the new 2.5.9 update I am working on. This update will include the 2.9.4.6 binary upgrade of Snort itself, and the 2.5.9 GUI package update will include some new features. I will figure out this Suppress List bug with IPv6 and include that fix as well.
Update – after looking at what is written to the Suppress List, it dawned on me what the problem is. I added a "fix" to allow wrapping of the long IPv6 addresses in the Alerts tab columns. What I had to do is provide a zero-length space in the IPv6 string to give the browser a line break opportunity for word wrapping. I put one of those codes at each colon in the address. That's what the code is. So I inadvertently introduced this problem. I will get it fixed, but would rather just include it in the 2.5.9 update mentioned above. That will be coming out before July.
Until then you should be able to manually edit the list. First, open the list on the Suppress List tab, click the edit icon, then delete any bogus entries. Save the list. Then manually add the information. It should not get overwritten again unless you click the plus ( + ) icon on the Alerts tab to automatically add another entry.
Bill
-
Until then you should be able to manually edit the list. First, open the list on the Suppress List tab, click the edit icon, then delete any bogus entries. Save the list. Then manually add the information. It should not get overwritten again unless you click the plus ( + ) icon on the Alerts tab to automatically add another entry.
If I create the entire supression line manually through the gui it still gets saved incorrectly. Try it yourself…
I will just suppress the entire rule for now until your next major version comes out (2.5.9). Thanks.
-
Until then you should be able to manually edit the list. First, open the list on the Suppress List tab, click the edit icon, then delete any bogus entries. Save the list. Then manually add the information. It should not get overwritten again unless you click the plus ( + ) icon on the Alerts tab to automatically add another entry.
If I create the entire supression line manually through the gui it still gets saved incorrectly. Try it yourself…
I will just suppress the entire rule for now until your next major version comes out (2.5.9). Thanks.
That's strange and unexpected. I will try to reproduce. Tell me the steps you did to get the error:
I assume click on an alert from the Alerts tab to auto-add to the Suppress List ?
Bill
-
I clicked on the add id to supress list in the alert log which works fine but does not have an IP address in it (which is normal).
Stop and restart snort works fine.
I then went to the suppress list page
I then clicked on e to edit the LAN suppress list.
I edited it through the gui to add ', track by_src, ip fe80::344b:2f8a:dc36:80e5' to the end of the autogenerated entry.
I then click save.
It brings me back to the suppress listing page
I click on e button to edit the list and it displays the ipv6 address all messed up again. -
I clicked on the add id to supress list in the alert log which works fine but does not have an IP address in it (which is normal).
Stop and restart snort works fine.
I then went to the suppress list page
I then clicked on e to edit the LAN suppress list.
I edited it through the gui to add ', track by_src, ip fe80::344b:2f8a:dc36:80e5' to the end of the autogenerated entry.
I then click save.
It brings me back to the suppress listing page
I click on e button to edit the list and it displays the ipv6 address all messed up again.Did you "copy and paste" the IP address into the list? If so, that's what happened. It copied in the "invisible" zero-length space codes. They do not display, but are picked up in the copied string text. I can put a "filter" on the Suppress List page to get rid of them prior to saving.
I can also see about adding an option to auto-add the "track by_src" kind of Suppress List entry. I will add a little plus (+) icon beside the existing (x) icon under the IP addresses in the Alerts tab. Clicking the (+) icon will add the IP address to the Suppress List.
Bill
-
I am not sure about pasting. I will try to VPN in and try both methods either late tonight or tomorrow.
by_src option from the GUI would be nice.
-
I am not sure about pasting. I will try to VPN in and try both methods either late tonight or tomorrow.
by_src option from the GUI would be nice.
by_src will be added. It's an easy addition that I just had not thought about. If you type in the IPv6 address and don't paste it, then you should be OK. Although it could be that the Suppress List is now corrupted with the bogus characters. It might have to be "wiped" and reloaded.
I'm very, very close to having the 2.5.9 package ready to submit to the Core Dev Team for review. I might be able to get it posted by the end of the weekend or very early next week for them to review.
Bill
-
I will try to look at it in the next 2 hours or so then so that I can report the results back to you quicker.
-
It is copy / paste that causes it. I typed it in manually in the web GUI and viewed it after saving and it was not messed up. I started and stopped the service without issues afterwards too.
