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Trying to get some emergency help because my website is being attacked. It isn't as much as an actual attack, as it is a small bot to exploit xenforo vulnerability.

https://xenforo.com/community/threads/mysql-attack.89082

That's a link to the original problem. I thought this was the best place to ask so I will ask here as well. Here is proof that this is an actual attack.

https://xenforo.com/community/proxy.php?image=http%3A%2F%2Fi.gyazo.com%2F893d37afef44ba7372a55ad415af1974.png&hash=8e44a697e4ff7fbcbd80840d4a781d90

This is the error that the website gives me

Zend_Db_Adapter_Mysqli_Exception: Too many connections - library/Zend/Db/Adapter/Mysqli.php:333
Generated By: Unknown Account, Today at 7:26 AM
Stack Trace
#0 /home/squadcra/public_html/library/Zend/Db/Adapter/Abstract.php(315): Zend_Db_Adapter_Mysqli->_connect()
#1 /home/squadcra/public_html/library/XenForo/Application.php(719): Zend_Db_Adapter_Abstract->getConnection()
#2 [internal function]: XenForo_Application->loadDb(Object(Zend_Config))
#3 /home/squadcra/public_html/library/XenForo/Application.php(960): call_user_func_array(Array, Array)
#4 /home/squadcra/public_html/library/XenForo/Application.php(991): XenForo_Application->lazyLoad('db', NULL)
#5 /home/squadcra/public_html/library/XenForo/Application.php(1561): XenForo_Application::get('db')
#6 /home/squadcra/public_html/library/XenForo/Model.php(161): XenForo_Application::getDb()
#7 /home/squadcra/public_html/library/XenForo/Model/DataRegistry.php(138): XenForo_Model->_getDb()
#8 /home/squadcra/public_html/library/XenForo/Model/DataRegistry.php(97): XenForo_Model_DataRegistry->_getMultiFromDb(Array)
#9 /home/squadcra/public_html/library/XenForo/Dependencies/Abstract.php(147): XenForo_Model_DataRegistry->getMulti(Array)
#10 /home/squadcra/public_html/library/XenForo/FrontController.php(127): XenForo_Dependencies_Abstract->preLoadData()
#11 /home/squadcra/public_html/index.php(13): XenForo_FrontController->run()
#12 {main}
Request State
array(3) {
["url"] => string(22) "http://squadcraft.net/"
["_GET"] => array(0) {
}
["_POST"] => array(0) {
}
}

I think this is an exploit where he has a bot that spam opens mysql connections, or just opens and holds open mysql connections. I don't know I'm not an expert. Anyway I need to limit the maximum number of open connections per ip address.

1 Answer 1

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I have an old post from March 2012 that limits a specific user's connections by the hour

How can I limit MySQL connections?

You also need to remove anonymous users : Cannot drop anonymous user from mysql.user

Get rid of test user access : MySQL : Why are there "test" entries in mysql.db?

Get rid of all users with no password with

DELETE FROM mysql.user WHERE password='';
FLUSH PRIVILEGES;

You could add a blanket rule on a specific IP addr (like 10.20.30.40)

INSERT INTO mysql.user SET
user='',host='10.20.30.40',
max_user_connections = 1,
max_connections = 1;
FLUSH PRIVILEGES;

Give Them a Try !!!

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