XFree86 security problem

From: Patrick J. Volkerding (gonzoat_private)
Date: Wed Mar 31 1999 - 09:12:52 PST

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    On Mon, 29 Mar 1999, Domas Mituzas wrote:
    > why is RedHat delaying release of this package
    > as it smells like root takeover (it was too easy
    > to change /etc/ and /etc/passwd permissions to
    > something neat).
    >
    > [...]
    >
    > This is cross-platform bug, as I found it in
    > all OS that run XFree86 3.3.3 server. As far as
    > I know it is on every Linux distribution (especially
    > newest ones) and BSD's.
    
    Before flying off the handle at Red Hat, you might consider that quite
    possibly they aren't vulnerable to this problem.  As far as I can tell, if
    the system ships with a /tmp/.X11-unix/ directory already in place, and
    none of the system scripts delete it, then there's no security problem
    since nobody can put a rogue symlink at that location in /tmp.
    
    I know Slackware Linux isn't vulnerable to this problem, and never was,
    and I don't think we're the only ones to ship a Linux OS that provides a
    pre-existing /tmp/.X11-unix/.
    
    --
    Patrick J. Volkerding
    Slackware Linux Project
    



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