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Spam Posts by bots?
katzlbt #1
Member since May 2006 · 41 posts
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Subject: Spam Posts by bots?
I have non registered posts (+CAPTCHA) enabled and receive spam links that are automatically added to the board every few days.

Any idea what I could do to prevent this? Is this a bug in the board or a config issue?

Thanks!
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katzlbt #2
Member since May 2006 · 41 posts
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So hier der Rest ...
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Yves (Administrator) #3
User title: UNB developer & webmaster
Member since Jan 2004 · 3864 posts · Location: Erlangen, Germany
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Do you have the spam filter plug-in installed? It may help a little bit with those link-only posts. But there's no guarantee.
♪ ...nanananah, all in all we’re just brilliant thieves, nanananah... ♪♬
katzlbt #4
Member since May 2006 · 41 posts
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For now, I have increased the required subject length.
In the long run only an improved captcha may help.
The one in UNB is to easy to decode with OCR.
Maybe use a handwriting font or similar.
A vertical offset between letters is also much more secure.
You can tune a filesystem, but you can't tune a fish!
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NFG #5
Member since Sep 2006 · 125 posts
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After enabling guest posting on my forum I'm seeing a similar problem.

I know on another (non-UNB) forum I admin I was able to kill all the auto-spam with a simple question.  "What's the name of this forum?" for example.  The guest couldn't post until they answered it correctly, and robots and foreign spammers have no idea what to do. 

Haven't looking into a similar option with UNB yet, but I will.
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Yves (Administrator) #6
User title: UNB developer & webmaster
Member since Jan 2004 · 3864 posts · Location: Erlangen, Germany
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In reply to post #4
I already have two other versions of a CAPTCHA image code finished. One was supposed to go into UNB2 and is used in a guestbook. The guestbook also receives a bit spam every now and then. But the CAPTCHA code seems to be entered by a human in that case because there was not a single failure with that (I'm logging those). See it at http://unclassified.de/tmp/captcha2/

The other one is only a few days old and not used anywhere. See it at http://unclassified.de/tmp/captcha3/

Could you please play a bit with them and tell me what you think of it?
♪ ...nanananah, all in all we’re just brilliant thieves, nanananah... ♪♬
jense #7
Member since Nov 2006 · 327 posts · Location: Dortmund
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Do they both work now with any version of the GD library?
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Yves (Administrator) #8
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Probably not. But you can add that function to your compatibility.lib.php to make your PHP compatible. ;)
♪ ...nanananah, all in all we’re just brilliant thieves, nanananah... ♪♬
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