Username: 
Password: 
Restrict session to IP 
Questions  |  score: 5  |  5.58 7.21 7.38 |  Solved By 99 People  |  187983 views  |  since Sep 28, 2012 - 21:02:39

Time to Reset (Exploit, Coding, PHP)

Time to Reset
I randomly browsed my todo and coded a challenge.
In this challenge you have to submit the password reset token for the user admin@wechall.net
Please note that your tokens are bound to your session.
You probably want to take a look at the sourcecode, also available in a highlighted version

The hint above is enough.

Good Luck!
GeSHi`ed PHP code for TimeToReset
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<?php
chdir('../../');
 
# Show source.
if (isset($_GET['show'])){
        header('Content-Type: text/plain');
        die(file_get_contents('challenge/time_to_reset/index.php'));
}
 define('GWF_PAGE_TITLE', 'Time to Reset');
require_once('challenge/html_head.php'); # output start of website
require_once GWF_CORE_PATH.'module/WeChall/solutionbox.php';
 
# Get the challengeif (false === ($chall = WC_Challenge::getByTitle(GWF_PAGE_TITLE)))
{
        $chall = WC_Challenge::dummyChallenge(GWF_PAGE_TITLE, 7, 'challenge/time_to_reset/index.php', false);
}
 require_once 'challenge/time_to_reset/TTR_Form.include';
require_once 'challenge/time_to_reset/TTR_Tokens.include';
 
# And display the header
$chall->showHeader(); 
# Generate csrf token
srand(time()+rand(0, 100));
$csrf = ttr_random(32);
$ttr = new TTR_Form();$form = $ttr->getForm($chall, $csrf);
 
if (isset($_POST['reset']))
{
        echo ttr_request($chall, $form);}
elseif (isset($_POST['solve']))
{
        ttr_submit($chall);
} 
echo GWF_Website::getDefaultOutput();
 
echo GWF_Box::box($chall->lang('info', array('index.php?show=source', 'index.php?highlight=christmas')), $chall->lang('title'));
 if (Common::getGetString('highlight') === 'christmas')
{
        $source = '[PHP title=TimeToReset]'.trim(file_get_contents('challenge/time_to_reset/index.php')).'';
        echo GWF_Box::box(GWF_BBCode::decode($source));
} 
echo $form->templateY($chall->lang('ft_reset'), GWF_WEB_ROOT.'challenge/time_to_reset/index.php');
 
formSolutionbox($chall);
 srand(GWF_Random::rand()); # Reset seed to something more secure. (thx noother) (thx Mart)
 
# Print Challenge Footer
echo $chall->copyrightFooter();
# Print end of websiterequire_once('challenge/html_foot.php');
 
#################
### FUNCTIONS ###
################# 
function ttr_random($len, $alpha='abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789')
{
        $alphalen = strlen($alpha) - 1;
        $key = '';        for($i = 0; $i < $len; $i++)
        {
                $key .= $alpha[rand(0, $alphalen)];
        }
        return $key;}
 
function ttr_request(WC_Challenge $chall, GWF_Form $form)
{
        if (false !== ($errors = $form->validate($chall)))        {
                return $errors;
        }
 
        # Generate reset token        $sid = GWF_Session::getSessSID();
        $email = $form->getVar('email');
        $token = ttr_random(16);
        
        if (!TTR_Tokens::insertToken($sid, $email, $token))        {
                return GWF_HTML::err('ERR_DATABASE', array(__FILE__, __LINE__));
        }
        
        # If it's your own real mail, even send it for the lulz :)        if ($email === GWF_User::getStaticOrGuest()->getValidMail())
        {
                ttr_mail_me($chall, $email, $token);
        }
                return GWF_HTML::message($chall->lang('title'), $chall->lang('msg_mail_sent'));
}
 
function ttr_submit(WC_Challenge $chall)
{        if ('' === ($answer = Common::getPostString('answer', '')))
        {
                return;
        }
                $sessid = GWF_Session::getSessSID();
 
        # First check all "custom" solutions
        $solutions = TTR_Tokens::getSolutions($sessid);
        foreach ($solutions as $solution)        {
                if ($solution['ttr_token'] === $answer)
                {
                        echo GWF_HTML::message($chall->lang('title'), $chall->lang('msg_reset_own', array(htmlspecialchars($solution['ttr_email']))));
                        return;                }
        }
        
        # Now lets check "THE" solution
        $solution = TTR_Tokens::getSolution($sessid);        $chall->setSolution($solution['ttr_token']);
        $chall->onSolve(GWF_User::getStaticOrGuest(), $answer);
}
 
function ttr_mail_me(WC_Challenge $chall, $email, $token){
        $mail = new GWF_Mail();
        $mail->setSender(GWF_BOT_EMAIL);
        $mail->setReceiver($email);
        $mail->setSubject($chall->lang('mail_subj'));        $mail->setBody($chall->lang('mail_body', array($token)));
        $mail->sendAsHTML('gizmore@wechall.net'); # cc me for testing purposes
}
?>
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