Great Circle Associates Firewalls
(September 1996)
 

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Subject: Summary: X server access control
From: meritj @ fincen . treas . gov (Jim Meritt)
Date: Wed, 25 Sep 1996 09:26:15 -0400
To: firewalls @ GreatCircle . COM, sun-manager @ fincen . treas . gov

The original question was:

> I've run SATAN against a couple of boxes and I get "No X server
> access control" - this is bad.  I've logged into that box and
> cleaned out every xhost + I can find - .xinitrc, everything
> in $OPENWINHOME/lib, .xsession, Xsession and anyplace else
> I can find it.  But the scan still comes up with the same
> warning.  I've read through SATAN perl and it is apparently doing
> it - but I don't see how.  Can someone advise me where else this
> ! @
 #$%%^#@ is hiding?
______________________________________________________________________________
From: Michel .
 Koenen @
 asml .
 nl (Michel Koenen)
Maybe you start openwin with the  -noauth  option...
Turn it off and hopefully SATAN will not complain anymore...

From: Tim Wyatt <timw @
 paradise .
 net>
Forgive me if I simply misinterpreted your posting, but you need to put a 
'xhost -' line in one of those files...  The default behavior for XFree86 
(the only X-server I have any X-pertise in), at least, is open unless 
explicitly closed.  Hope this helps...
______________________________________________________________________________
From: A .
 Chan @
 CdnAir .
 CA (Alan Chan)
Try looking at:

~user/.cshrc
~user/.login
~user/.profile
~user/.openwin-init

	Or if you have the time, try:

	cd dir_name
	find . -xdev -print -exec grep xhost {} \;

	This will take a while and slows down system considerably.  This looks
through all files ane search for the string xhost.  It will scroll up quickly.
You can dump it to a file and look at it later.
______________________________________________________________________________
From: Steve Lodin <swlodin @
 eng .
 delcoelect .
 com>

Generally, this vulnerability is only discovered if someone is
actually using the X server process and has turned off X server access
control while Satan was scanning.

You might need to have the user log off and log back on again
(restarting the X server in the process).  You didn't say, but I
assume it was a Sun workstation.  PCs and X terminals are more
difficult to fix sometimes.
______________________________________________________________________________
From: Michael Wright ED23 <michael @
 morticia .
 msfc .
 nasa .
 gov>

xhost could also be in the .login or .profile.  I keep mine in there to turn
xhost on and then not use it.

______________________________________________________________________________
From: djohnson @
 nbserv2 .
 dseg .
 ti .
 com (Danny Johnson 0172547)

as I recall there is some way to fake an xhost by writing some
'skeleton key' kind of entry into your .Xauthority file...
______________________________________________________________________________


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