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
Mail last read Mon Mar 31 11:08 2014 (UTC)
No Plan.
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LEARN ABOUT DEBIAN
xfm_mime.types
XFM_MIME.TYPES(5) XFM XFM_MIME.TYPES(5)
NAME
xfm_mime.types - suffix based fall back mime type information
DESCRIPTION
When xfm(1) cannot determine the type of a file using the values in xfm_magic(5), this file is used to guess a type of a file. The file
shipped with xfm by default just tells to include the files ~/.mime.types and /etc/mime.types to get the system wide settings.
FORMAT
There is one entry per line. Empty lines and lines starting with a hash (#) are ignored. Prior entries overwrite later ones.
If a line starts with !include or include the rest of the line is treated as a filename to process before continuing with the rest of the
file. (If the filename starts with a tilde followed by a slash, the tilde is replaced by the content of the HOME environment variable.)
Other lines contain the name of a mime type followed by an arbitrary number of filename suffixes, separated by spaces or tabs.
A file that got no other type associated by content and whose name ends with a dot followed by the specified suffix, will be treated as
type mime type.
Xfm only recognizes suffixes with at most 7 characters.
EXAMPLES
Otherwise unidentified files anding in .c are treated as text/x-csrc:
text/x-csrc c
Same with .c++, cpp, cxx or cc as text/x-c++src:
text/x-c++src c++ cpp cxx cc
FILES
$HOME/.xfm/xfm_mime.types
Unless xfm(1) is told to look at a different place via X resource Xfm.mimeTypesFile, this is the first place xfm looks for a file
with the describes format.
/etc/X11/xfm/xfm_mime.types
If the first file does not exists, xfm(1) (unless it gets told a different place via the X resource Xfm.systemwideMimeTypesFile)
looks for this file.
$HOME/.mime.types
General user settings normaly included from /etc/X11/xfm/xfm_mime.types
/etc/mime.types
General system wide settings normaly included from /etc/X11/xfm/xfm_mime.types
SEE ALSO
xfm(1)
xfm 20 April, 2006 XFM_MIME.TYPES(5)