Snort 2.9.2.3 pkg v. 2.5.0 Issues

Cino

Question: With all the new suppression entries required, is there a way to add a descriptor above each suppress entry? I notice the add feature from the alerts list leaves a space between each entry added to the suppress list. Could find nothing on this one in the docs.

sure:


# **** Main Suppress List ****
# ****************************
#
# HTTP INSPECT Suppress
#
# DOUBLE DECODING ATTACK
suppress gen_id 119, sig_id 2
# suppress gen_id 119, sig_id 3
# NON-RFC DEFINED CHAR
suppress gen_id 119, sig_id 14
# suppress gen_id 119, sig_id 19
# suppress gen_id 119, sig_id 32
# suppress gen_id 119, sig_id 31
# NO CONTENT-LENGTH OR TRANSFER-ENCODING IN HTTP RESPONSE
suppress gen_id 120, sig_id 3
# HTTP RESPONSE GZIP DECOMPRESSION FAILED
suppress gen_id 120, sig_id 6
# INVALID CONTENT-LENGTH OR CHUNK SIZE
suppress gen_id 120, sig_id 8

Cino

If I disable all my suppression rules I'm able to reproduce the WAN IP blocking on the fly.. I did notice that new snort binary was built at 2012-Jul-17 21:37:45. Did this include the changes you made or will the next will?

miles267

What happened to the snort Whitelist UI screen? It used to allow you to input into unique dialog boxes a description and IP or CIDR. No all Alias IPs are crammed into a single, narrow dialog box. This seems like a step backward.

dwood

Thanks Cino :-) Just what I was looking for.

Miles, create an Alias list for your IPs. (under Firewall - Aliases). Then reference that alias in your whitelist. As soon as you start typing the name of your alias it will autofill in the whitelist box.

miles267

@dwood:

Thanks Cino :-) Just what I was looking for.

Miles, create an Alias list for your IPs. (under Firewall - Aliases). Then reference that alias in your whitelist. As soon as you start typing the name of your alias it will autofill in the whitelist box.

Thanks so much dwood. This is a great tip. I didn't realize it changed and that you can use these alias lists.

dwood

Miles, no worries. Ermal is the guy you need to thank for cooking up the code :-)

Ermal, I've noticed that when using the Alerts - Add to Suppress List feature, the signature is correctly added to the suppress list, but with a blank line preceding it. I've also observed that Snort will fail to start if there is a blank line in the suppress list. A bug?

Cheers,
Dennis.

dwood

After an automated update:

Jul 18 01:05:10 php: /snort/snort_interfaces.php: Interface Rule START for CABLE(re1)…
Jul 18 01:05:10 snort[46927]: FATAL ERROR: /usr/local/etc/snort/preproc_rules/sensitive-data.rules(1) Unknown ClassType: sdf
Jul 18 01:05:10 snort[46927]: FATAL ERROR: /usr/local/etc/snort/preproc_rules/sensitive-data.rules(1) Unknown ClassType: sdf
Jul 18 01:05:10 snort[46927]: Initializing rule chains…
Jul 18 01:05:10 snort[46927]: Initializing rule chains…

and with sensitive data rules toggled off, starting snort fails with this:

Jul 18 01:08:35 snort[219]: FATAL ERROR: /usr/local/etc/snort/preproc_rules/preprocessor.rules(201) Unknown ClassType: sdf
Jul 18 01:08:35 snort[219]: Initializing rule chains…

digdug3

@dwood: had the same problem.

Just removed and reinstalled with the latest binary and all is working again.

@ermail: is it possible to add the snort build number/date somewhere in the GUI? This way everybody nows exactly where they are.

mdima

@ermal:

@dwood:

Same thing here..had to remove 2.5.0. WAN IP x.x.x.0 network was being blocked. PFsense log than alerted on WAN down, and removed it from routing group (dual wan).

Cheers,
Dennis.

As i put in the other thread.
There is an issue that was solved with blocking not parsing correctly the whitelist.
Just re-install the binary.

Hi Ermal,
well, unfortunately it's still doing that, I upgraded the package few hours ago. It is blocking IPs that are in the whitelist alias, and also CARP VIPs.

Btw, managing the whitelist with an alias is awesome!

Thanks,
Michele

simby

how do i use alias?

eri--

I pushed a fix to the sensitive data rules.
Please test it after 30 minutes.

@ermail: is it possible to add the snort build number/date somewhere in the GUI? This way everybody nows exactly where they are.

I would prefer not since its not needed and you are just reporting bugs here.

eri--

@dwood:

Fired up 2.5.0 on two different installations (AMD64, 2.0.1) So far, so good.

Ermal, can you sort blocked IPs the same as in the alerts? Alerts on both interfaces are listed so the most recent is at the top of the page (perfecto), however blocked IPs are randomly sorted.

Normally youcan click on the headers to sort them

Question: With all the new suppression entries required, is there a way to add a descriptor above each suppress entry? I notice the add feature from the alerts list leaves a space between each entry added to the suppress list. Could find nothing on this one in the docs.

Added the description

judex

@simby:

how do i use alias?

Go to the Firewall Tab and select Aliases. There you can add them for ports, servers, netlists, host, etc.

fragged

No sensitive data preproc errors, snort starts again. Though I had to go to if settings -> categories and save settings again before I got snort to actually load rules. Instead of loading rules and end up using about 1.5 GB of ram, Snort just stayed at 400 MB'ish of memory usage.

Cino

@dwood:

After an automated update:

Jul 18 01:05:10 php: /snort/snort_interfaces.php: Interface Rule START for CABLE(re1)…
Jul 18 01:05:10 snort[46927]: FATAL ERROR: /usr/local/etc/snort/preproc_rules/sensitive-data.rules(1) Unknown ClassType: sdf
Jul 18 01:05:10 snort[46927]: FATAL ERROR: /usr/local/etc/snort/preproc_rules/sensitive-data.rules(1) Unknown ClassType: sdf
Jul 18 01:05:10 snort[46927]: Initializing rule chains…
Jul 18 01:05:10 snort[46927]: Initializing rule chains…

and with sensitive data rules toggled off, starting snort fails with this:

Jul 18 01:08:35 snort[219]: FATAL ERROR: /usr/local/etc/snort/preproc_rules/preprocessor.rules(201) Unknown ClassType: sdf
Jul 18 01:08:35 snort[219]: Initializing rule chains…

I reported this yesterday and same thing happen again when I woke up this morning.. it failed the auto update…manual update after deleting the md5 files did the trick.

Fesoj

After the latest update (2012-Jul-17 20:58:56) my system log shows the following unpleasant entry:

Jul 18 11:16:33 php[46772]:
/snort/snort_interfaces.php: The command '/usr/bin/sed -Ie -f 's/^alert(.)classtype:sdf;(.)/# alert^Aclasstype:sdf^B/g' /usr/local/etc/snort/snort_52344_em0/preproc_rules/preprocessor.rules' returned exit code '1', the output was 'sed: s/^alert(.)classtype:sdf;(.)/# alert^Aclasstype:sdf^B/g: No such file or directory'

Since an expression is given on the cmd line, the -f causes the error. When ommitted, the cmd executes with 2 effects:
(1) there is a backup file named preprocessor.rulese due to the -Ie option, and
(2) the line alert ( msg: "SDF_COMBO_ALERT"; sid: 1; gid: 139; rev: 1; metadata: rule-type preproc ; classtype:sdf; )
is replaced by # alert^Aclasstype:sdf^B, which was probably not intended.

For my setup the error message has no consequences, but ermal should have a look at it at some point. Maybe the sed cmd should start with s.th. like this: /usr/bin/sed -I.bak -e ….

PS: The lines 1298 ff in snort.inc are responsible for this.

Fesoj

Cino,

I reported this yesterday and same thing happen again when I woke up this morning.. it failed the auto update…manual update after deleting the md5 files did the trick.

SDF sounds familiar. Please have a look at my post #74 and try removing the -f option (file and line is given in my post) and see what happens. Or, maybe comment out the sed command, because the intend could have been to comment out the SDF rule, which could then generate your error message.

eri--

Oops Fesoj fixed :)

Fesoj

ermal,

Oops Fesoj fixed

not really. If the sensitive rules are not active the file is not created and you do get a similar error message as before.

I got:
Jul 18 13:35:15 php[46772]:
/snort/snort_interfaces.php: The command '/usr/bin/sed -Ie -f /usr/local/etc/snort/snort_52344_em0/tmp/sedcmd /usr/local/etc/snort/snort_52344_em0/preproc_rules/preprocessor.rules' returned exit code '1', the output was 'sed: /usr/local/etc/snort/snort_52344_em0/tmp/sedcmd: No such file or directory'

Fesoj

ermal,

consider adding an innocent mkdir {$snortcfgdir}/tmp if these dirs do not exist at the appropriate places.