Re: Possible flaw in XFree?

From: Nuno Branco (brancoat_private)
Date: Fri Jun 28 2002 - 09:16:41 PDT

  • Next message: Jedi/Sector One: "Re: Possible flaw in XFree?"

    try to start your Xserver with the command
    
    [root@machine branco]$ startx && exit
    
    Maybe it will do the trick :)
    
    
    On Thu, 2002-06-27 at 20:06, William N. Zanatta wrote:
    > Hi folks,
    > 
    >    Talking about some bad experiences with my friend, I discovered (he 
    > told me) it is possible to abort a X session even when the screen is 
    > locked by some kind of application like 'xlock'.
    > 
    >    I have made the following test:
    > 
    >    1. Logged into the system as 'william' (a normal non-privileged user).
    >    2. startx
    >    3. Run xlock
    >    ... the screen is now locked...
    >    4. Tried a hit on some keys. The password screen appears.
    >    5. Then, 'ctrl-alt-backspace' and voila... X is down and my console 
    > is there, opened for me.
    > 
    >    I see this as a serious problem once one could let his/her X session 
    > opened and locked and anyone who have access to that machine could abort 
    > the X session and start playing around with the logged user's shell 
    > (which could be the root shell).
    > 
    >    What about that?
    > 
    >    Tested on:
    > -------------------------------------
    > XFree86 Version 4.1.0 / X Window System
    > (protocol Version 11, revision 0, vendor release 6510)
    > Release Date: 2 June 2001
    >          If the server is older than 6-12 months, or if your card is
    >          newer than the above date, look for a newer version before
    >          reporting problems.  (See http://www.XFree86.Org/FAQ)
    > Build Operating System: Linux 2.2.19 i686 [ELF]
    > -------------------------------------
    > 
    >    Regards,
    > 
    >    William Zanatta
    > 
    > -- 
    > Perl combines all of the worst aspects of BASIC, C and line noise.
    >                  -- Keith Packard
    > 
    -- 
    Atentamente, 
    Nuno Branco
    
    MARKDATA
    Rua Padre Luis Aparicio, 10 - 5º 
    1150-248 Lisboa 
    Telefone: 213173400 
    Fax: 213155046 
    
    http://www.markdata.net/
    



    This archive was generated by hypermail 2b30 : Fri Jun 28 2002 - 11:05:53 PDT