Re: Grabbing sockets with bind???
When Jens B. Jorgensen replied to Stephen Carpenter thusly, I replied:
>
> Shut down samba on your linux box before doing this. It is already bound to those
> ports. Also yes, you must run nc as root if you want to bind to those ports.
And you might like to have a look at /etc/services and /etc/inetd.conf
before you choose port numbers for use.
>
> Stephen Carpenter wrote:
>
> > Ok...
> > I have had a problem under debian linux..and I just can't figure out WHY
> > I am
> > a while back the "land" attack was posted on bugtraq...and just for
> > "Shits and giggles" I decided to see if I could make a version of it
> > using a shell script and the "netcat" program.
> > I did and it worked fine under RedHat 5.0 ...but under debian it gives
> > errors
> > here is the meat of it it starts with
> > nc -n -z -w9 "$1" "$2" || {echo "error messga ehere" ; exit0 ;}
> > that basically checks to make sur ethat the computer on the
> > reciving end is listening onthat prt and exists if it doesn't
> > work...that passes fine...
> > here is the "meat" of it:
> > nc -n -s "$1" -p "$2" "$1" "$2" -w 2
> > here it errors. when I send it after my own win95 machine (I said it was
> > only for
> > "shits and giggles" I don't see much point in crashing someone elses
> > system
> > when I can't sit here and actually SEE it crash )
> > anyway...today my win95 IP is 132.183.129.170 (don't even try...its
> > behind a
> > VERY restrictive firewall) I get this error:
> > Can't grab 132.183.129.170:139 with bind : Cannot assign requested IP
> > adress
> > in fact I get that error anytime I try to use netcats very limited IP
> > spoofing capabilities
> > ok..yea..I know this isn't stff im "supposed to be doing"
> > but I am curious to know what is differnt about the debian
> > system from the RedHat system that I wrote this on?
> > I even tried running it as root (and with nc suid root)....still no luck
> >
> > I realize that this is a very good policy for normal systems but...
> > how do I turn it off on my singl euser system here just for some fun?
> > -Steve
> > --
> > -=Signature has been removed because it made an unfair comparison
> > between NT 4 and Linux =-
> > replacement: (ok I admit...I am bored..its a slow day at work)
> > [sjc@debian ~]$fortune -o
> > Anything more than 3 shakes is for fun.
> >
> > --
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>
> --
> Jens B. Jorgensen
> jjorgens@bdsinc.com
>
> --
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--
-----------------------------------------
Ralph Winslow rjw@nac.net
The IQ of the group is that of the member
whose IQ is lowest divided by the number
of members.
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