Re: Grabbing sockets with bind???
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.
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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