Hacker Adds Malicious Code To All Html And Php Files

Apr 30, 2009

we have been having a strange hacking problem on our server that we can not seem to find how they are managing to accompish. I am just wondering if anyone here may be able to offer any suggestions on this?

The problem:

On our server, a hacker has managed to add malicious code to all html and php files on two hosting accounts that we operate. These two accounts are seperate and do not share login information. This is the 2nd time this has happened within the past two weeks.

Originally it was suspected that we needed to add SuPhp to prevent insecure permissions. This has been done, yet the problem continues.

On all html pages, malicious javascript has been added, and on all php files malicious php code has been added.

We have a lot of accounts on this server, and as mentioned only the two accounts seem to have been affected by this.

What we have done to attempt to secure the server:
1) We have installed SuPhp.

2) We have ensured that all scripts on the affected websites are updated and running the latest versions.

3) We have changed all the passwords.

Our server is a managed server, and our server company has been very helpful, however at the moment can not seem to pinpoint the problem. There also does not appear to be any indication via the access logs of the infected files being altered, yet they have been altered.

The computers used to access these websites are clean, and do not have any malware running, which would allow a hacker to obtain any passwords. It also does not appear that the hacker was able to obtain root access.

One other thing I noticed, we run Kayako on one of the sites. When this problem occurs we receive a message that Zend Optimizer is not installed on our server when attempting to login to Kayako, when in fact it is.

Searching Google, I found the following link on the Zend site in which the symptoms seem to be very similar. What are the odds this could be a Zend vulnerabilty?


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