11-14-2016
X Windows Security Issue
Hi there,
I am trying to understanding the difference between X11, host- based versus user-based access controls. And how vulnerability can the X11 settings be and why it is recommended to turn it off.
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$ finger yeti
Login: yeti Name: yeti
Directory: /arpa/tz/y/yeti Shell: /bin/ksh
On since Wed Apr 2 15:24 (UTC) on pts/149
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No Plan.
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Xserver(1) General Commands Manual Xserver(1)
NAME
X - X Window System display server dispatcher
SYNOPSIS
X [ option ...]
DESCRIPTION
:
Hewlett-Packard supports two X servers on HP-UX platforms, the Xhp X server which supports HP VISUALIZE graphics devices and the Xf86 X
server which supports all other graphics devices. These X servers are delivered as /usr/bin/X11/Xhp and /usr/bin/X11/Xf86.
The X dispatcher determines which X server to launch based on the available graphics devices. The control file /etc/X11/Xstart can provide
additional guidance to the X dispatcher. The control file allows the user to specify which X server to start for given display connection
numbers. The only X servers supported by the X dispatcher are Xhp, Xf86 and Xvfb. If no Xstart file exists, the dispatcher loads the
appropriate X server for the graphics device in the system. HP-UX does not deliver the /etc/X11/Xstart file. This file can be created by
using the SAM/SMH utility.
OPTIONS
If the X dispatcher is invoked with no arguments, the display connection is assumed to be :0. The X dispatcher checks for display connec-
tion options and, if found, uses that display connection number when it checks the Xstart file. All other options are passed on to the X
server when it is started and it is the X server's responsibility to validate these options. Not all options may be supported on both X
servers; refer to Xhp(1) and Xf86(1) to verify supported options for each X server.
RETURN VALUE
None
Xstart EXAMPLES
The control file syntax is the X server to start followed by the display connection number. Valid entries take the form of:
Xhp :0 Start the Xhp X server on display connection 0
Xf86 :10 Start the Xf86 X server on display 10
/usr/bin/X11/Xhp :5 Start the Xhp X server on display connection 5
/usr/bin/X11/Xvfb :7 Start the X Virtual Framebuffer server on display connection 7
FILES
/etc/X11/Xstart Dispatcher control file.
/var/X11/Xserver/logs/Xstartup.N.log X dispatcher log file for display N.
SEE ALSO
X(1), Xhp(1), Xf86(1)
STANDARDS CONFORMANCE
See the appropriate section in Xhp(1) or Xf86(1).
Xserver(1)