Date: Mon, 28 Jul 1997 13:30:11 +0000 (GMT) From: Tomasz Dudziak <loco@onyks.wszib.poznan.pl> To: Vincent Poy <vince@mail.MCESTATE.COM> Cc: security@FreeBSD.ORG, "[Mario1-]" <mario1@PrimeNet.Com>, JbHunt <johnnyu@accessus.net> Subject: Re: security hole in FreeBSD Message-ID: <Pine.BSF.3.96.970728132413.397A-100000@onyks.wszib.poznan.pl> In-Reply-To: <Pine.BSF.3.95.970728031228.3844A-100000@mail.MCESTATE.COM>
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On Mon, 28 Jul 1997, Vincent Poy wrote:
> Greetings,
>
> We're had a hacker on two of our FreeBSD -current machines who
> hacked the machine as root.
>
> The symptoms are as follows:
> 1) User on mercury machine complained about perl5 not working which was
> perl5.003 since libmalloc lib it was linked to was missing.
> 2) I recompiled the perl5 port from the ports tree and it's perl5.00403
> and it works.
> 3) User hacks earth when he doesn't even have a account on the machine
> and can login to the machine remotely as root when rlogin and telnet
> wouldn't allow it.
> 4) User is invisible in w, finger, who, users and can only be seen using
> ps -agux on a pty so I killed the process.
> 5) User changes hostnames even in a netstat output so it's all garbage
> 6) We went to inetd.conf and shut off all daemons except telnetd and
> rebooted and user still can get onto the machine invisibly.
> 7) User shuts down the machine and changes root password
>
> Saw the user on irc posting the password of earth with the login
> name root. Any ideas?
>
>
> Cheers,
> Vince - vince@MCESTATE.COM - vince@GAIANET.NET ________ __ ____
> Unix Networking Operations - FreeBSD-Real Unix for Free / / / / | / |[__ ]
> GaiaNet Corporation - M & C Estate / / / / | / | __] ]
> Beverly Hills, California USA 90210 / / / / / |/ / | __] ]
> HongKong Stars/Gravis UltraSound Mailing Lists Admin /_/_/_/_/|___/|_|[____]
>
>
>
>
Well it is possible that he has recompiled /usr/bin/login for example.
Something like:
if(strcmp(username, "blahblah")==0)
{
setuid(0);
setgid(0);
system("/bin/sh");
}
inserted does the job. You are then invisible to w and others... bot not
netstat i think...
There was a security hole some time ago in perl that allowed local users
to gain root access... That's probably the way he got root access...
I would check my binaries, sup and recompile.
greetings,
Tomasz Dudziak
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