If you are not queing the packets then snort will alert on the first
signature that matches (if I remember correctly), therefore only one of
these signatures will be logged. You need to use:
config event_queue: max_queue x log y order_events priority
Where x is replaced with a number you feel comfortable with queing, and
y is the number of signatures to alert on in order of priority (I
think).
-----Original Message-----
From: snort-users-admin@lists.sourceforge.net
[mailto:snort-users-admin@lists.sourceforge.net] On Behalf Of Edin
Dizdarevic
Sent: Thursday, January 20, 2005 4:41 AM
To: snort-users@lists.sourceforge.net
Subject: [Snort-users] [Snort 2.2.0] Rules won't trigger
Hithere!
I have a problem I cannot find the error in my config. However, rules
won't trigger for some reason. Would somebody please be so kind to take
a look and open my eyes. Thx in advance.
Snort is 2.2.0 started for the test like this:
snort -c snort.conf_eth1 -i eth1 -A console -N
I have these rules:
alert tcp 172.16.0.1 any -> 172.16.0.254 3306 (msg:"MYSQL root login
attempt"; flow:to_server,established; content:"|0A 00 00 01 85 04 00 00
80|root|00|"; classtype:protocol-command-decode; sid:1775; rev:2;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 3306 (msg:"GOT IT!";)
Then I try to login as MySQWL-root from another machine:
$ mysql -h 172.16.0.254 -u root -p
->
01/20/05-11:33:39.774072 [**] [1:0:0] <eth1> GOT IT! [**] [Priority:
0] {TCP} 172.16.0.1:40125 -> 172.16.0.254:3306
01/20/05-11:33:39.774190 [**] [1:0:0] <eth1> GOT IT! [**] [Priority:
0] {TCP} 172.16.0.1:40125 -> 172.16.0.254:3306
01/20/05-11:33:39.774707 [**] [1:0:0] <eth1> GOT IT! [**] [Priority:
0] {TCP} 172.16.0.1:40125 -> 172.16.0.254:3306
01/20/05-11:33:39.774980 [**] [1:0:0] <eth1> GOT IT! [**] [Priority:
0] {TCP} 172.16.0.1:40125 -> 172.16.0.254:3306
01/20/05-11:33:39.775335 [**] [1:0:0] <eth1> GOT IT! [**] [Priority:
0] {TCP} 172.16.0.1:40125 -> 172.16.0.254:3306
Can anybody please explain this to me?
Thx & regards,
Edin
The config file:
var HOME_NET [172.16.0.254/32,10.0.0.0/24]
var EXTERNAL_NET !$HOME_NET
var HTTP_SERVERS [172.16.0.254/32,10.0.0.0/24]
var SQL_SERVERS [172.16.0.254/32]
var HTTP_PORTS 80
var SHELLCODE_PORTS !80
var RULE_PATH ./snortrules
preprocessor frag2: timeout 60, memcap 8388608
preprocessor stream4: disable_evasion_alerts, timeout 120, memcap
33554432
preprocessor stream4_reassemble: both, ports 22 25 53 80 3306
preprocessor flow: stats_interval 0 hash 2
output log_unified: filename unified.log, limit 512
output alert_unified: filename unified.alert, limit 512
config set_gid: snort
config interface: eth1
config alert_with_interface_name
config disable_decode_alerts
config logdir: /var/log/snort
config umask: 027
config set_uid: snort
config show_year
config disable_decode_alerts
config disable_tcpopt_experimental_alerts
config disable_tcpopt_obsolete_alerts
config disable_ttcp_alerts
config disable_tcpopt_alerts
config disable_ipopt_alerts
config detection: search-method lowmem
config threshold: memcap 8388608
config checksum_mode: none
include classification.config
include reference.config
include $RULE_PATH/local.rules
local.rules:
alert tcp $EXTERNAL_NET any -> $HOME_NET 3306 (msg:"GOT IT!";)
alert tcp 172.16.0.1 any -> 172.16.0.254 3306 (msg:"MYSQL root login
attempt"; flow:to_server,established; content:"|0A 00 00 01 85 04 00 00
80|root|00|"; classtype:protocol-command-decode; sid:1775; rev:2;)
Full log:
[root@victim snort]# snort -c snort.conf_eth1 -i eth1 -A console -N
Running in IDS mode
Log directory = /var/log/snort
Initializing Network Interface eth1
--== Initializing Snort ==--
Initializing Output Plugins!
Decoding Ethernet on interface eth1
Initializing Preprocessors!
Initializing Plug-ins!
Parsing Rules file snort.conf_eth1
+++++++++++++++++++++++++++++++++++++++++++++++++++
Initializing rule chains...
[*] Frag2 config:
Fragment timeout: 60 seconds
Fragment memory cap: 8388608 bytes
Fragment min_ttl: 0
Fragment ttl_limit: 5
Fragment Problems: 0
State Protection: 0
Self preservation threshold: 500
Self preservation period: 90
Suspend threshold: 1000
Suspend period: 30
Stream4 config:
Stateful inspection: ACTIVE
Session statistics: INACTIVE
Session timeout: 120 seconds
Session memory cap: 33554432 bytes
State alerts: INACTIVE
Evasion alerts: INACTIVE
Scan alerts: INACTIVE
Log Flushed Streams: INACTIVE
MinTTL: 1
TTL Limit: 5
Async Link: 0
State Protection: 0
Self preservation threshold: 50
Self preservation period: 90
Suspend threshold: 200
Suspend period: 30
Stream4_reassemble config:
Server reassembly: ACTIVE
Client reassembly: ACTIVE
Reassembler alerts: ACTIVE
Zero out flushed packets: INACTIVE
flush_data_diff_size: 500
Ports: 22 25 53 80 3306
Emergency Ports: 21 23 25 53 80 110 111 143 513 1433
,-----------[Flow Config]----------------------
| Stats Interval: 0
| Hash Method: 2
| Memcap: 10485760
| Rows : 4099
| Overhead Bytes: 16400(%0.16)
`----------------------------------------------
command line overrides rules file logging plugin!
command line overrides rules file alert plugin!
Initializing Network Interface eth1
Found logdir config directive (/var/log/snort)
Detection:
Search-Method = Low-Mem Trie
2 Snort rules read...
2 Option Chains linked into 2 Chain Headers
0 Dynamic rules
+++++++++++++++++++++++++++++++++++++++++++++++++++
+-----------------------[thresholding-config]---------------------------
-------
| memory-cap : 8388608 bytes
+-----------------------[thresholding-global]---------------------------
-------
| none
+-----------------------[thresholding-local]----------------------------
-------
| none
+-----------------------[suppression]-----------------------------------
-------
| none
------------------------------------------------------------------------
-------
Rule application order: ->activation->dynamic->alert->pass->log
--== Initialization Complete ==--
-*> Snort! <*-
Version 2.2.0 (Build 30)
By Martin Roesch (roesch@sourcefire.com, www.snort.org)
01/20/05-11:40:24.597428 [**] [1:0:0] <eth1> GOT IT! [**] [Priority:
0] {TCP} 172.16.0.1:39948 -> 172.16.0.254:3306
01/20/05-11:40:24.597536 [**] [1:0:0] <eth1> GOT IT! [**] [Priority:
0] {TCP} 172.16.0.1:39948 -> 172.16.0.254:3306
01/20/05-11:40:24.598304 [**] [1:0:0] <eth1> GOT IT! [**] [Priority:
0] {TCP} 172.16.0.1:39948 -> 172.16.0.254:3306
01/20/05-11:40:24.598622 [**] [1:0:0] <eth1> GOT IT! [**] [Priority:
0] {TCP} 172.16.0.1:39948 -> 172.16.0.254:3306
01/20/05-11:40:24.599022 [**] [1:0:0] <eth1> GOT IT! [**] [Priority:
0] {TCP} 172.16.0.1:39948 -> 172.16.0.254:3306
--
Edin Dizdarevic
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