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...

Your Answer:

Login to answer

Other forums

How can you detect variable string in a massive string?
Ok guys, i need some help with this one.

I am going to be getting a large string, like 10-20

Display certain image depending on time of year
Hi, I am new to these forums and would really appreciate some advice on a piece of coding I have don

Image upload - determine folder
I have an upload script that may be accessed from different directories. Problem is, the script is m

form problem
Hi all, I think this is going to be easy to resolve but for I have been looking at it to long and I

Material Master Update through BAPI - Follow up material not updated
Hi Experts,

I am updating the material master through a custom transaction using the BAPI

CRM?
I think that's what they're called. Customer Management System? Anyway. Is there any good free ones

Is it a good practice to store user info. in sessions?
I am making a user class for my script which stores all the user information in sessions. It takes u

updating a single value to multiple non consecutive rows
I need to update the same value to multiple non consecutive rows. I need to add an experation date t

Why do I get this error?
Error:

Parse error: syntax error, unexpected T_ENCAPSED_AND_WHITESPACE, expecting T_STRING or

Displaying Column Names
I have a question regarding the ability to show the column names from my table/query.
What I'm lo