In our Apache server we have received around 200 HTTP GET requests from the same IP and a common string in each request is "md5", e.g.

index.php?option=com_s5clanroster&view=s5clanroster&layout=category&task=category&id=-null%27+/*!50000UnIoN*/+/*!50000SeLeCt*/md5(3.1415),222--%20- HTTP/1.1

What kind of attack hacker had tried over here, and should I worry about it?


1 Answer 1


The attacker is trying to exploit Joomla component called com_s5clanroster which is vulnerable to SQL Injection.

An SQL injection vulnerability has been reported in Joomla Com S5clanroster. Successful exploitation of this vulnerability would allow a remote attacker to execute arbitrary SQL commands on the affected system.


That same component was also vulnerable to LFI:

  [o] Exploit



Maybe you don't have that component installed or maybe you are running different CMS, but make sure that you check your website is up-to-date. And not only that, also check if different plugins are still maintained by author, because I saw vulnerable plugins with no updates available from author - and that is consider as a big problem.

Here is another example which can lead to another problem: Expired Domain Leads to WordPress Plugin Redirects

Consider to use ModSecurity (Open Source Web Application Firewall). How to?

  • 1
    Thank you for the valuable answer! I have crosschecked on the server and there is no com_s5clanroster component installed. Sep 11, 2017 at 5:04
  • 1
    please also tell me about md5 string in the request? Sep 11, 2017 at 5:10
  • 11
    You don't need to worry about that.
    – Mirsad
    Sep 11, 2017 at 5:12
  • 2
    The MD5 might be a time based attack? It would take some time to compute the MD5 which might be detectable client side?
    – Silver
    Sep 11, 2017 at 9:15
  • 16
    In order for the attacker to know that the SQL injection is successful, they want to call a function on the database that has a known result and see if that result is in the output generated. The choice of md5() specifically is largely irrelevant to the attack. Sep 11, 2017 at 17:28

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.