[Snort-users] ACID errors

pbsarnac at ...1799... pbsarnac at ...1799...
Tue Sep 25 16:37:02 EDT 2001


Slowly learning SQL here, and figuring some of this out. It looks like ACID
is barfing because the ref_id number in the sig_reference table is set to 0
for these alerts. If I do an UPDATE and assign a likely candidate from the
reference table, the querys will complete, and ACID works... to a degree.
The URLs for the ref_tag in the reference table aren't showing up properly
in ACID. When I look at the table, they've been truncated. Looking at the
desc of the reference table shows that the ref_tag field is a varchar(20),
and the urls from the snort rule are 38 characters long. Did the schema
update somewhere that I didn't catch, or do we need to change the size of
that field?

Anyway, since I'm still not sure what I'm doing here, I'm guessing that
when snort sends the output to MySQL, MySQL complains because the ref_tag
value from this rule doesn't fit. At that point, Snort doesn't finish
inserting the rest of the info from the rule. The ref_id never gets matched
up in the sig_reference table, so instead we get the default of 0. Because
the ref_id is 0, there is no match for it in the reference table, and ACID
barfs when trying to look up the ref_system_name from the reference_system
table with a null ref_system_id.  Does that sound about right?

If I'm correct, it looks like either the rule's reference tag needs to get
shorter, or the reference table needs to get bigger.

----- Forwarded by Patrick B Sarnacke/Corporate/ThoughtWorks/US on
09/25/2001 06:13 PM -----
|--------+--------------------------------------->
|        |          pbsarnac at ...1799...    |
|        |          Sent by:                     |
|        |          snort-users-admin at ...635...|
|        |          eforge.net                   |
|        |                                       |
|        |                                       |
|        |          09/25/2001 04:57 PM          |
|        |                                       |
|--------+--------------------------------------->
  >----------------------------------------------------------------------------------------------------|
  |                                                                                                    |
  |      To:     snort-users at lists.sourceforge.net                                                     |
  |      cc:                                                                                           |
  |      Subject:     RE: [Snort-users] ACID errors                                                    |
  >----------------------------------------------------------------------------------------------------|





No go, however when I was poking through my new acid_conf.php, I saw the
debug options (doh! should have looked there first!). I turned on debugging
and sql logging. Here's what pops up. Does it mean anything to anyone? ( I
removed the 'Meta Criteria' box and the table headers for fear that my
email server would mangle them oubound. If you feel that they might be
important, let me know and I'll attach a screenshot.

         URL: '/acid/acid_qry_main.php' (referred by:
'http://sumadre.thoughtworks.com/acid/acid_qry_main.php?new=1')
         PARAMETERS: ''
         CLIENT: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:0.9.3)
Gecko/20010801
         SERVER: Apache/1.3.20 (Unix) PHP/4.0.6
         SERVER HW: Linux sumadre.thoughtworks.com 2.4.2-2 #1 Sun Apr 8
20:41:30 EDT 2001 i686 unknown
         DATABASE TYPE: mysql  DB ABSTRACTION VERSION:
         PHP VERSION: 4.0.6  PHP API: apache
         SESSION ID: 78c4723428cf46d757dcef531aba1fee

Checking for DB abstraction lib in '/home/httpd/html/adodb/adodb.inc.php'
sensor #1: event.cid = 19203, acid_event.cid = 19203
sensor #2: event.cid = 230, acid_event.cid = 230
sensor #3: event.cid = 14931, acid_event.cid = 14931
sensor #4: event.cid = 0, acid_event.cid = 0
Added 0 alert(s) to the Alert cache








        new: '1'
        submit: 'Query DB'
        sort_order: ''
        num_result_rows: '-1'  current_view: '-1'
        layer4: ''  caller: ''
        action: ''  action_arg: ''

Initial/Canned Query or Sort Clicked


SQL (save_sql): SELECT acid_event.sid, acid_event.cid, signature,
timestamp, ip_src, ip_dst, ip_proto FROM acid_event WHERE acid_event.sid >
0 AND sig_name LIKE '%WEB-MISC readme.eml attempt%' AND ( ( YEAR(timestamp)
= 2001 AND MONTH(timestamp) = 09 AND DAYOFMONTH(timestamp) = 25 ) )
Valid Canned Query List


Array
(
    [last_tcp] => Array
        (
            [0] => 15
            [1] => Last TCP
            [2] => time_d
        )

    [last_udp] => Array
        (
            [0] => 15
            [1] => Last UDP Alerts
            [2] => time_d
        )

    [last_icmp] => Array
        (
            [0] => 15
            [1] => Last ICMP Alerts
            [2] => time_d
        )

    [last_any] => Array
        (
            [0] => 15
            [1] => Last Alerts
            [2] => time_d
        )

)

Query State
caller = ''
num_result_rows = '1'
sort_order = ''
current_view = '0'
action_arg = ''
action = ''
SELECT acid_event.sid, acid_event.cid, signature, timestamp, ip_src,
ip_dst, ip_proto FROM acid_event WHERE acid_event.sid > 0 AND sig_name LIKE
'%WEB-MISC readme.eml attempt%' AND ( ( YEAR(timestamp) = 2001 AND
MONTH(timestamp) = 09 AND DAYOFMONTH(timestamp) = 25 ) )


                     Displaying alerts 1-1 of 1 total

Database ERROR:You have an error in your SQL syntax near '' at line 1


SELECT ref_system_name FROM reference_system WHERE ref_system_id=








|--------+--------------------------------------->
|        |          Steve Halligan               |
|        |          <agent33 at ...187...>      |
|        |          Sent by:                     |
|        |          snort-users-admin at ...635...|
|        |          eforge.net                   |
|        |                                       |
|        |                                       |
|        |          09/25/2001 04:15 PM          |
|        |                                       |
|--------+--------------------------------------->
  >
----------------------------------------------------------------------------------------------------|

  |
|
  |      To:     "'snort-users at lists.sourceforge.net'"
<snort-users at lists.sourceforge.net>             |
  |      cc:
|
  |      Subject:     RE: [Snort-users] ACID errors
|
  >
----------------------------------------------------------------------------------------------------|





If this is accurate and you are using ACID v0.9.6b1, you should upgrade to
a
newer version.  It is up to v0.9.6b16 in CVS and b15 in tarball.
-steve


>
> Snort Version 1.8.1-RELEASE (Build 74)
> ACID v0.9.6b1
>
> These are the signatures (from the snort.sourcefire.com ruleset):
> web-misc.rules:alert tcp $EXTERNAL_NET 80 -> $HOME_NET any
> (msg:"WEB-MISC
> readme.eml autoload attempt"; flags:A+; content:"window.open
> (\"readme.eml\""; nocase; classtype:attempted-user; sid:1290; rev:3;
> reference:url,www.cert.org/advisories/CA-2001-26.html;)
> web-misc.rules:alert tcp $EXTERNAL_NET 80 -> $HOME_NET any
> (msg:"WEB-MISC
> readme.eml attempt"; flags:A+; uricontent:"readme.eml"; nocase;
> classtype:attempted-user; sid:1284; rev:3;
> reference:url,www.cert.org/advisories/CA-2001-26.html;)
>
> Any help is greatly appreciated!
>
> Thanks,
> pat s.
>
>
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