C-RAM
Group:
Application Notes
We have found some things
that are very useful while working as a team on the EE 552 project.
- The remote screen capture feature is
useful when you are 'multitasking' on a few workstations (eg to compile)
or if you want to check what your partner is working on at that moment.
You can easily capture and display the a remote computer screen on your
own computer screen.
Last Modified: October 5, 2001
Remote Screen Capture in
the X-host Environment
- At
a UNIX workstation terminal, determine the workstation your want to check
the window of. This can be done by 'fingering' the person logged in at the
workstation.
- Make
sure the target terminal is running xhost. You can do this by first
'telneting' to the terminal or by remote log in. Then at the target
terminal, type the following at the prompt.
% xhost +
- To
initiate a screen capture, in the xterm window of the LOCAL terminal, type
the following.
% xwd -root -display
xxx.xxx.xxx.xxx:0.0 > filename
where xxx.xxx.xxx.xxx is
the Internet Protocol (IP) address of the UNIX machine to be attacked. The
attack in this case, is to capture the targeted machine's screen. The filename
is the file where the screen capture will be saved on the attackers computer.
- To
display the captured image enter:
xwud -infilename
- The
Xwindows screen capture feature is not a software bug, but into XWindows
for system administration and information sharing. This attack has the
potential to be conducted through a firewall but no experiment has been
done yet at this time. The exploitation of this xhost+ feature is
undetectable and can be run at any time.