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Enhanced Captcha Image Verification - stop bots from signing up!! Details »
Enhanced Captcha Image Verification - stop bots from signing up!!
Mod Version: 1.11, by steadicamop (Member) steadicamop is offline
Developer Last Online: Dec 2014 I like it Show Printable Version Email this Page

vB Version: 3.6.8 Rating: (63 votes - 4.89 average) Installs: 871
Released: 26 Nov 2006 Last Update: 27 Nov 2006 Downloads: 4753
Not Supported Uses Plugins Template Edits Additional Files  

Title : Enhanced Captcha Image Verification

Version : 1.1

Coder : Andy Calderbank & Jason Williams

Purpose
: Add extra Image Verification to the registration process, using an alternative system to the Captcha system.

Why : It would appear that spammers can now "read" the Captcha codes and overcome the verification process.

How : This extra feature uses images which are harder for a spam program/bot to interpret than text characters. The user has a choice of 4 randomly displayed images, and the answer is given below. The user must click on that image to proceed, if the incorrect image is selected an error message is shown. The images are randomly shown (from however many are in the directory - you can have as many as you want, just has to be more that 4!) and are automatically created from the images/verification/ directory - all on the fly. Sample images are included with this release, but you can use your own - I recommend using 100 x 100 pixels, in .jpg format and naming the image with a meaningful title (ie A House.jpg) - the extension is stripped so only the filename itself is shown.

To further enhance security, the images are passed through a script which means that none of the images on the screen have file names - and cannot be associated to the question by title alone.

I have been testing this on my forum and have found it to be effective - I cannot guarantee that this will stop all spamming, but this relies more on human input than a computer "reading" the image.

Important : This has been tested on 3.6.2 - I cannot guarantee it will work on anything above, please test with caution - and as always BACKUP FIRST! This will not work on anything below 3.6.0.

Demo : http://www.steadiforum.com/register.php

I hope this is help to the VBulletin community as I know this is a growing problem. I don't fancy the thought of trawling through hundreds of new members deleting stupid usernames and spam posts.

Installation :
  1. Upload the verification/ directory to your images/ folder - make sure .htaccess and show.php are present - otherwise it won't work.
  2. Import Product - product-image_verification.xml

Upgrading :
  1. Upload show.php to the images/verification/ directory.
  2. Import Product - product-image_verification.xml - select Allow Overwrite to enable upgrade.

Requirements : GD Libraries installed

File uploads : 39 (including images)
Files to Import : 1
New Templates : 1
New Phrases : 5
Uses Hooks : 1
New Queries : 0

History :
v1.0 - Original release
v1.01 - Slight code change for forums in sub-directories (thanks go to Barakat for solving this one)
v1.1 - Issue resolved with Windows servers also template clean up for xhtml compliance
v1.11 - Added version check function, minor upgrade.

Done - if you like please click install! (and I won't ask for any donations as long as you click Nominate for MOTM!)

Don't forget you don't have to use the provided images - you can customise these to any you wish - I've used ones that are hopefully universal and everyone will recognise.

Download Now

Only licensed members can download files, Click Here for more information.

Screenshots

Click image for larger version

Name:	imageverification1.jpg
Views:	8590
Size:	36.6 KB
ID:	56611   Click image for larger version

Name:	imageverification2.jpg
Views:	4478
Size:	24.5 KB
ID:	56612  

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  • This modification may not be copied, reproduced or published elsewhere without author's permission.
Similar Mod
Mod Developer Type Replies Last Post
Miscellaneous Hacks Enhanced Image Captcha - Stop bots from signing up! steadicamop vBulletin 3.7 Add-ons 165 21 May 2015 01:36

  #361  
Old 03 Jul 2010, 10:57
EtaiWix EtaiWix is offline
 
Join Date: Jun 2010
What's GD libraries? I'd like to install it, but I can't find it...

This sounds like a great hack for our forum.
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  #362  
Old 03 Jul 2010, 14:04
dtommy79 dtommy79 is offline
 
Join Date: Jul 2007
GD libraries is installed on your webserver. Usually it's not your concern
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  #363  
Old 11 Jul 2010, 01:24
Naan-Kadavul's Avatar
Naan-Kadavul Naan-Kadavul is offline
 
Join Date: Sep 2009
Location: Singpore
Real name: Bharath
Warning: dir(images/verification/) [function.dir]: failed to open dir: Result too large in [path]\register.php(204) : eval()'d code on line 6

Fatal error: Call to a member function read() on a non-object in C:\Inetpub\vhosts\MovieJockey.com\httpdocs\forum\register.php(204) : eval()'d code on line 7

I get this
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Site Founded : 11 September 2009 / Re-Launched : 01 January 2010
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  #364  
Old 27 Jul 2010, 21:28
thunderclap82 thunderclap82 is offline
 
Join Date: Dec 2008
Any plans for a vB 4 release? Or does it already work with vB4?
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  #365  
Old 11 Aug 2010, 13:46
Naan-Kadavul's Avatar
Naan-Kadavul Naan-Kadavul is offline
 
Join Date: Sep 2009
Location: Singpore
Real name: Bharath
Thanks for it, Going to install first n say the rest.
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Site Founded : 11 September 2009 / Re-Launched : 01 January 2010
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Copyright ©2000 - 2010, Jelsoft Enterprises Ltd.

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  #366  
Old 11 Aug 2010, 20:46
alehawk alehawk is offline
 
Join Date: Apr 2008
I got this installed but bots are passing thru
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  #367  
Old 19 Aug 2010, 21:24
flashfocus flashfocus is offline
 
Join Date: Dec 2004
This was working fine for us too, but since a few weeks, a lot of bots (or chinese?) have made it through ...
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  #368  
Old 27 Aug 2010, 15:06
KLUNZ's Avatar
KLUNZ KLUNZ is offline
 
Join Date: Aug 2008
don't work on 3.8.5
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  #369  
Old 08 Sep 2010, 12:37
Merjawy's Avatar
Merjawy Merjawy is offline
 
Join Date: Sep 2002
Location: USA
Originally Posted by flashfocus View Post
This was working fine for us too, but since a few weeks, a lot of bots (or chinese?) have made it through ...
I wouldn't use the default (images/file names) It's bound to get bots trained on it

I use different images and/or different file (pic) names. Let them keep training their bots for all I care.. I haven't had 1 single bot register since I installed this where I used to have lots every day



Thanks
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  #370  
Old 11 Sep 2010, 22:10
XanderZone XanderZone is offline
 
Join Date: Aug 2008
I installed this today, and bots are still posting all over my forums.
I will try to upload some other pictures.

Although, if they programmed their bots well, comparing a piece of text with a filename isn't all that hard to bypass
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  #371  
Old 19 Sep 2010, 15:24
Areku Areku is offline
 
Join Date: Feb 2002
Originally Posted by XanderZone View Post
Although, if they programmed their bots well, comparing a piece of text with a filename isn't all that hard to bypass

Well, that should not be happening:

the images are passed through a script which means that none of the images on the screen have file names - and cannot be associated to the question by title alone.
It's actually easier than that for bots.

Problem is actually that with default installation bots just revisit the site UP TO 4 times and they'll come in, just adding the ?parameter=correctanswer to the url...

Just increase the number of images and replace default images/names.



SO the more images you add, the less likely they'll pass thru. It just depends on how many retries the bot has been set to.
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  #372  
Old 13 Jan 2011, 21:45
voter's Avatar
voter voter is offline
 
Join Date: Dec 2006
Nice hack.
Thank you.
Here are some more "intellectual" pictures that may be will help also real users to learn something when already registering to your forum
elements.zip
I think due to actual hacked reCAPTCHA problem this mode must get a MoD of The Moth status.
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  #373  
Old 16 Jan 2011, 22:52
Big Kahuna's Avatar
Big Kahuna Big Kahuna is offline
 
Join Date: Feb 2002
Well -- that's didn't stop the bots
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  #374  
Old 18 Jan 2011, 15:27
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Join Date: Dec 2006
Originally Posted by Big Kahuna View Post
Well -- that's didn't stop the bots
Do you mean it didn't hinder Bots to register into your forum?
I could say that after installing this, new Bot/XRumer registrations in our forum are 0 now. To be honest I increased the complexity to 6 images.

Or if you need to prevent Bots from posting when using already registered, e-mail verified users, then you need to use Spam Management of vbulletin with Akismet?
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  #375  
Old 18 Jan 2011, 15:55
Big Kahuna's Avatar
Big Kahuna Big Kahuna is offline
 
Join Date: Feb 2002
ten minutes late I had a couple new registrations --

However I've since changed the directory of the images, and updated the addon and the template for the updated directory name.

I also installed the addon that checks thje ip address against a blacklist of known spammers, and change the human verification to the most complicated captcha -- and the combination of that has stopped the spamming.
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