Filters Problem with Encylopedia

Hangin' Around Joined: Oct 10, 2004 Posts: 35

Date & Time: 2004-11-06 16:31:19
Blocked IP: XX.XX.XX.XX
User ID: SOMEUSERNAME (####)
Reason: Abuse-Filter
--------------------
User Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040803 Firefox/0.9.3
Query String: [ Only registered users can see links on this board! Get registered or login! ]
Forwarded For: none
Client IP: none
Remote Address: XX.XX.XX.XX
Remote Port: 12141
Request Method: GET

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Why is the above (EDITED) triggering off as bad and blocking that user because of filters?

Site Admin/Owner Joined: Aug 27, 2002 Posts: 17088

"concat" is a filtered word that XSS sometimes use.

Look for this code in includes/sentinel.php

Code:

  // Check for XSS attack


  if (eregi("http\:\/\/", $name) OR (eregi("cmd",$querystring) AND !eregi("&cmd",$querystring)) OR (eregi("exec",$querystring) AND !eregi("execu",$querystring)) OR eregi("concat",$querystring)) {

Remove it or comment it out at your own risk.

Posted: Sat Nov 06, 2004 9:40 pm

Thats a bummer, its a command listed in my enclyopedia which users sometime search for. Is there anything more that I could add instead of removing it? "concat<SOMELETTER>" like "concatb" if there was more to that string usually sent?

Posted: Sat Nov 06, 2004 9:43 pm

Perhaps:

Code:




  if (eregi("http\:\/\/", $name) OR (eregi("cmd",$querystring) AND !eregi("&cmd",$querystring)) OR (eregi("exec",$querystring) AND !eregi("execu",$querystring)) OR eregi("concat",$querystring) AND !eregi("y=concat",$querystring)) {

Would work?

Posted: Sat Nov 06, 2004 9:45 pm

Try it and find out Wink

Posted: Sat Nov 06, 2004 9:58 pm

Nope.. sure doesnt work. And searching for concat here is not a good idea. When I clicked on the resulting searchs found, I got sentinel'ed. heh. So any ideas on anything I can add to the word concat that would be used in the attack but not trigger if they only search for exactly concat?

Posted: Sat Nov 06, 2004 10:07 pm

Try your search again.

Posted: Sat Nov 06, 2004 10:10 pm

That worked, I was able to search here and click through on the result without being banned.

Posted: Sat Nov 06, 2004 10:17 pm

Just comment it out.

Posted: Sat Nov 06, 2004 10:21 pm

Oh.. well you had me a little worried that someone would XSS attack me if I did that.. was hoping for a way to be safe and still allow people to search for concat. Oh well.. guess I can unban them all the time.

Posted: Sat Nov 06, 2004 10:24 pm

There is but I am involved in a project right now and can't tend to it. If someone else doesn't help you with this get back to me in a day or so.

Posted: Sat Nov 06, 2004 10:30 pm

Ya, no rush, I will check back in a couple, rather unban a couple people now and again then open up holes whenever possible.