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  1. #1

    Help with hackers on Linux server box

    For the past couple of weeks, my gaming community's website and forums have been under near-constant attack. At least once a day, we'll open up the site only to see that every page has been replaced with some simple HTML page with mocking ASCII text or something similar. We've also had our databases erased as well, and our server goes down multiple times a day due to what we believe is a DoS attack. I'll lay out our situation here as clearly and with as much detail as I can, because we really need to solve this problem.

    Our setup is as follows: We split a server box with a few other clients, sharing amongst us four IP addresses. Each of us have only access to our own user folder. Our user folder contains game servers (Team Fortress 2 and Minecraft), a voice server (Mumble), and two installations of the newest version of phpBB that share a database, which constitutes our website.

    Here are the problems we're having:
    1. Our website data gets overwritten from time to time, resulting in a site where every single page links to the same thing. It's always a very simply coded HTML page of ASCII text saying something stupid. All the files in the /forums and /home directories suddenly have the same file size, as they all contain only the HTML code for this hacked page.
    2. Our server box goes down daily, for times ranging from a few minutes to a few hours. Only sometimes are our files changed after this happens. We suspect it's a DoS attack, but we're confused because they're not attacking just our IP, but the IPs of everyone using our server box. No one except the clients know which IPs are used by our box, and the information is not posted anywhere. This makes us think that whatever's happening is coming from inside the server itself.
    3. Our folder with our installation of Mumble got all its files wiped. Someone came into our Mumble server, followed by a superuser (not one of us) and banned everyone in the server, then apparently proceeded to delete it.

    We've checked logs and everything to no avail. We've installed anti-bruteforce and anti-DoS packages, as well as scripts that read the system processes and report them to a logfile, which didn't help us narrow it down either. We think it's probably code injection, or at least we did until our voice server files got wiped. Now we just don't know.

    Any help would be much appreciated.

  2. #2
    Linux Guru Lakshmipathi's Avatar
    Join Date
    Sep 2006
    3rd rock from sun - Often seen near moon
    I haven't maintained such a high traffic site. Few tips to make it secure.

    > Our website data gets overwritten from time to time
    That's serious security issue. Have you enabled SELinux?
    Make sure only required ports are allowed through firewall.
    Your admin account and password are safe enough?

    Install Chapter*13.*Intrusion Detection with AIDE
    First they ignore you,Then they laugh at you,Then they fight with you,Then you win. - M.K.Gandhi
    FOSS India Award winning ext3fs Undelete tool Online Linux Terminal

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