What is my most likely problem?

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User information and users on my site have been deleted. What is the most likely cause for this?

Posted 9-Oct-13 18:24pm

Mr Jason

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ArunRajendra 10-Oct-13 0:28am

You have been hacked.

3 solutions

Solution 3

Not only your site, there's a lot.
This article is just for you people. Security: It’s Getting Worse[^]

Posted 9-Oct-13 22:52pm

thatraja

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Ron Beyer · Accepted Answer · 2013-10-09T18:26:00

Solution 1

SQL injection attack, how do you form your SQL statements? That is the most likely source of database loss.

By the way, if you have a lot of users and are the victim of an SQL injection attack, you may want to tell your users (hopefully you have a backup) that they may have had data stolen. This includes email addresses, passwords (if stored in plain text), user names, and any other personal information stored in your database. Usually the hacker deletes the users as a last action after stealing everything they can.

Posted 9-Oct-13 18:26pm

Ron Beyer

Updated 9-Oct-13 22:55pm

v2

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Ron Beyer 10-Oct-13 0:42am

By the way, if you have a lot of users and are the victim of an SQL injection attack, you may want to tell your users (hopefully you have a backup) that they may have had data stolen. This includes email addresses, passwords (if stored in plain text), user names, and any other personal information stored in your database. Usually the hacker deletes the users as a last action after stealing everything they can.

Mr Jason 13-Oct-13 22:54pm

thanks tonnes! I sanitized my strings, luckily I had a backup

Sergey Alexandrovich Kryukov 10-Oct-13 1:54am

5ed. I also added some references in my answer. The first one shows exactly the OP's case. :-)
—SA

thatraja 10-Oct-13 4:55am

5!

Sergey Alexandrovich Kryukov · Accepted Answer · 2013-10-09T19:54:00

Solution 2

In addition to Solution 1:

Here is how the users can be deleted: http://xkcd.com/327[^].

For further detail, please see my past answers:
EROR IN UPATE in com.ExecuteNonQuery();[^],
hi name is not displaying in name?[^].

Use this: http://msdn.microsoft.com/en-us/library/ff648339.aspx[^].

—SA

Posted 9-Oct-13 19:54pm

Sergey Alexandrovich Kryukov

Comments

thatraja 10-Oct-13 4:54am

Still I remember that strip :D, 5!

Sergey Alexandrovich Kryukov 10-Oct-13 12:36pm

Thank you, Raja.
—SA

Ron Beyer 10-Oct-13 9:07am

+5'd, XKCD usually sums it up pretty well, most computer geeks know about little Bobby Tables :)

Sergey Alexandrovich Kryukov 10-Oct-13 12:37pm

Thank you, Ron.
But I learned about it only recently. :-)
—SA

Ron Beyer 10-Oct-13 13:16pm

xkcd is a good way to waste a working day :)

Sergey Alexandrovich Kryukov 10-Oct-13 13:32pm

Fortunately, I have strong idiosyncrasy against any kinds of comics. Especially the typography/script style they use, it causes pain in my eye... :-)
—SA