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SubjectRe: Is this a compromise and how?
It looks like you've been r00ted, dude!

Someone installed a r00tk1t and you are now seeing the after-effects of
it. What I'd do, in your case:

back up /usr/local, /home, /etc, then reload the system clean, and replace
teh backups. The system should be in a close state (read: no root kit) to
before you reloaded it.

Good luck!

On Thu, 14 Dec 2000 brian@worldcontrol.com wrote:

> Sorry is this is too far off topic, but it seems to me the
> kernel may be helping in this break in or maybe some magic
> aspect of the filesystem.
>
> I noted in an ls that
>
> -rwxr-xr-x 1 root root 36784 Jul 17 05:06 rpc.mountd*
> -rwxr-xr-x 1 root root 3368 Jul 17 05:06 rpc.nfsd*
> -rwxr-xr-x 1 root ftp 22 Sep 8 22:15 rpc.rcmd*
> -rwxr-xr-x 1 root root 9872 Jul 17 05:06 rpc.rquotad*
> -rwxr-xr-x 1 root root 13936 Feb 9 2000 rpc.rstatd*
> -rwxr-xr-x 1 root root 7952 Feb 9 2000 rpc.rusersd*
> -rwxr-xr-x 1 root root 6512 Feb 11 2000 rpc.rwalld*
> -rwxr-xr-x 1 root root 17624 Mar 7 2000 rpc.yppasswdd*
> -rwxr-xr-x 1 root root 23984 Mar 7 2000 rpc.ypxfrd*
> -rwxr-xr-x 1 root root 10692 Sep 5 16:03 rpcinfo*
>
> rpc.rcmd look a little suspicious?
>
> And guess what it contains?
>
> %cat /usr/sbin/rpc.rcmd
> /usr/include/strlib.h
>
> Hmmmm.
>
> %ls -l /usr/include/strlib.h
> -rwxr-xr-x 1 root root 16768 Sep 16 09:55 /usr/include/strlib.h*
>
> %file /usr/include/strlib.h
> /usr/include/strlib.h: ELF 32-bit LSB executable, Intel 80386, version 1, dynamically linked (uses shared libs), not stripped
>
> %/usr/include/strlib.h
> bind: Address already in use
>
> Now watch this magic trick:
>
> %mkdir foo
> %cd foo
> %touch strlib.h
> %ls
> %find . -print
> .
> ./strlib.h
> %
>
> Get it? strlib.h never appears in the file system via ls whereever
> it may be created.
>
> More fun:
>
> %echo hello >strlib.h
> %ls
> %cat strlib.h
> hello
> %
>
> Pretty cool huh?
>
> Let me know if you would like a copy of the code.
>
> A quick strace shows that it binds to port 24000.
>
> It also contains a list of 5 IP addrs. I suspect it doesn't
> broadcast, but allows people in from those IPs.
>
> Anyone know what has happened? I religiously install the redhat
> updates, and am subscribed to the CERT advistors and install
> the fixes the moment I get them.
>
> The system was RedHat 6.2, linux 2.2.17pre14 at the time the
> breakin occured.
>
> I've been running firewalled with only services I provide turned
> on for access, and in /etc/inetd.conf.
>
> What is keeping strlib.h from appearing ls's? A hacked ls command?
>
>

--
Kelsey Hudson khudson@ctica.com
Software Engineer
Compendium Technologies, Inc (619) 725-0771
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