Re: Someone hacked my apache2 server

[Dan_Mitton@xxxxxxx]

Oleg,

Some other things to check/do if you
don't already know this...

Be sure that the httpd process runs
as a completely unprivileged user with nothing but read access to ANYTHING.
Be sure that the content of your site
is not owned by the same user as the httpd user.  Read only access
should be through group, other or acl.
Be sure that the apache config files,
libraries, binaries, etc. are owned by as different user then the httpd
process user.  Read and Execute access should be through group, other
or acl.

Same goes for MySQL and any other processes
running on the machines.  The running processes should NOT have write
access to their own config files.

Try to think about the problem form
the running processes perspective, if I was the httpd/mysql/etc. process,
what can I hurt?  Get that to a minimum.

If there is a buffer overflow problem
somewhere, you might not be able to prevent the in memory running process
from being hacked, but as long as they can't hack the files on the server(s),
a quick stop/start or reboot should fix the problem.

Good Luck!

Dan

Please respond to users@xxxxxxxxxxxxxxxx

To:        users@xxxxxxxxxxxxxxxx
cc:         (bcc: Dan Mitton/YD/RWDOE)
Subject:        Re: [users@httpd] Someone hacked my apache2 server

LSN: Not Relevant
User Filed as: Not a Record

Oh, ok. I got it. I have already disabled it (actually,
immediately after the attack).
Thanks for the advice. I appreciate!
Oleg.

On Sun, Apr 4, 2010 at 5:52 PM, Daniel Reinhardt <cryptodan@xxxxxxxxxxxxx>
wrote:

--------------------------------------------------
From: "Oleg Goryunov" <oleg.goryunov@xxxxxxxxx>
Sent: 04 April, 2010 13:39

To: <users@xxxxxxxxxxxxxxxx>
Subject: Re: [users@httpd] Someone hacked my apache2 server


Yes, there is a MySQL server. And actually, I noticed
that - while the
server was returning the mentioned hacked page, mysql process was on top
of
the list of the "top" command. Though, it took only 1.5% of the
CPU.
But, mysql is restricted to accept connections from outside world. It only
listens on local socket.
What kind of vulnarability does mysql have? Do you know where I can read
about it?
Oleg.

On Sun, Apr 4, 2010 at 4:55 PM, Daniel Reinhardt <cryptodan@xxxxxxxxxxxxx>wrote:


--------------------------------------------------
From: "Oleg Goryunov" <oleg.goryunov@xxxxxxxxx>
Sent: 03 April, 2010 21:03
To: <users@xxxxxxxxxxxxxxxx>
Subject: [users@httpd] Someone hacked my apache2 server

 Hello all,
It looks like someone hacked my apache2 server and I am
trying to
understand
how this could have happened.
This is what happened:
All of a sudden the server - in response to a web-browser request for a
page
- started to give a full screen of unknown characters (looked like a long
text with encoding mismatch).
The output was immediate and the same for all the web-sites located on
the
server.
Looking at the page source of the output I see the following:
=========

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==================
The address indicated in the begining of the page code leads to some
chinese
server.
So, somehow it happened that the output of the apache server was
substituted
by this page, which redirected visitors to some chinese server.

But the most strange thing was that the problem dissapeared itself! So,
it
last for 10 minutes then disappeared! And the again started and again
dissapeared. Finally, I turned down apache untill I understand what is
going
on...

Any idea how could that happen?  How to reproduce this? How to prevent?
Where to look for logs? I have check both ssh logs and apache logs, there
is
nothing that could seem unusual there...

Any help is appreciated.
Oleg.


Oleg,

Are you running any sort of MySQL Database on this machine, and if so is
it
patched and fully updated along with any php scripts.  What you are
showing
us is indicative of a SQL Injection Attack.

Shocked no one has mentioned especially with the rampant incline of the
Russian Business Network to spread its malware through the use of SQL
Injection on any vulnerable website.

Thanks,
Daniel

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Oleg,

Its not a vulnerability with MySQL it is a vulnerable PHP Script such as
an outdated PHPMyAdmin or PHPMyAdmin itself.  I hardly run it on my
servers.  I would promptly disable it.


Thanks,
Daniel 

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