Write Forums

Captcha problem users just refresh and it will let them auto submit again

Posted on 16th Feb 2014 07:03 pm by admin

Users will just re submit and not have to enter the new captcha.. ? Lol but if i refresh the page, the captcha auto makes a new1 so u cant submit.

But if u enter captcha code alrdy, then submit form correctly, and press refresh to auto submit form, it does it? This is a major security risk here is my code, thanks:

Code: session_start();

$RandomStr = md5(microtime());// md5 to generate the random string
$text = rand(10000,99999);
$_SESSION["key"] = $text;
$height = 25;
$width = 35;

$image_p = imagecreate($width, $height);
$black = imagecolorallocate($image_p, 100, 5, 5);
$white = imagecolorallocate($image_p, 155, 155, 025);
$font_size = 16;
$text=substr($_SESSION['key'],0,3);
imagestring($image_p, $font_size, 5, 5, $text, $white);
imagejpeg($image_p, null, 80);

then my HTML:

Code: <tr class="bts ce"><td colspan=2><b>Security Code Confirmation</b></td></tr>

<tr>
<td align="right">Your unique security code<input type="hidden" name="secId" value="76c2b0e6f20ed0f1b209bcf39dee8e06"></td>
<td>
<img src="php_captcha.php">

<span class="desc">If The images are broke, please contact us.</span></span>
</td>
</tr>
Is there a way so people cant auto submit form?

Captcha works if u refresh but people can just auto submit the form and it will keep submiiting...

No comments posted yet

312 34 Tweet

 formating when pulling data from a mysql database 
Ok so Im not to sure if this is the right thread to post in but here is my catch 22 issue.

I 
Header is not working in IE  
Hi ! header function is not working in IE but it works in FF, Safari, Chrome. any help please. :
Please help - should be a simple fix.. driving me nuts 
Everything seemed to be working fine.  I have a table, it alphabetically lists a bunch of cities and
Can't find a decent web analytics!!! 
I've downloaded and installed Piwik. It's location detection based on IP addresses is fairly inaccur
WS-Security PL/SQL Forms  
Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - Prod 

PL/SQL Release 10.2.0.2.0 - P