OneTwenty web services temporarily down (attempted hack?)

OneTwenty web services were temporarily down earlier today, possibly due to an attempted hack. The kernel caught a TCP window shrink attempt:

TCP: Treason uncloaked! Peer shrinks window

This page has a few explainations of what the problem could be. The http site at the IP address in question looks to be a vanilla Mandrake install. Running a reverse DNS lookup reveals that the computer is somewhere in China (that is, if it isn’t a masqueraded IP).

Anyhow, the kernel caught the problem and I used iptables to automatically drop packets originating from that IP address. Anyone else have something like this happen recently?

Update: Installed OSSEC per Steve‘s suggestion. The latest version (0.9.3) installs easily (following the instructions in the manual) and even creates the /etc/init.d/ossec file for easy use in Ubuntu!

2 thoughts on “OneTwenty web services temporarily down (attempted hack?)”

  1. My firewall machine gets hack attempts almost constantly. I run OSSEC, and get reports like this on a daily basis:

    sshd[4783]: Invalid user webadmin from
    sshd[4775]: Invalid user tomcat from
    sshd[4763]: Invalid user samba from
    sshd[4755]: Invalid user office from
    sshd[4745]: Invalid user alias from
    sshd[4736]: Invalid user recruit from
    sshd[4727]: Invalid user sales from

    OSSEC then blocks that host within iptables and hosts.deny. Might be worth looking at.

  2. Ah, thanks!

    I adhered to your previous advice when someone hacked ViSLAB. Stay calm and don’t do anything rash… aside from that… wasn’t sure what else to do 🙁

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