[ GLSA 200608-25 ] X.org and some X.org libraries: Local privilege escalations

[Raphael Marichez <falco () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200608-25
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                                            http://security.gentoo.org/
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  Severity: High
     Title: X.org and some X.org libraries: Local privilege escalations
      Date: August 28, 2006
      Bugs: #135974
        ID: 200608-25

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Synopsis
========

X.org, libX11, xdm, xf86dga, xinit, xload, xtrans, and xterm are
vulnerable to local privilege escalations because of unchecked
setuid() calls.

Background
==========

X.org is an implementation of the X Window System.

Affected packages
=================

    -------------------------------------------------------------------
     Package                             /  Vulnerable  /   Unaffected
    -------------------------------------------------------------------
  1  x11-apps/xdm                           < 1.0.4-r1     >= 1.0.4-r1
  2  x11-apps/xinit                         < 1.0.2-r6     >= 1.0.2-r6
  3  x11-apps/xload                         < 1.0.1-r1     >= 1.0.1-r1
  4  x11-apps/xf86dga                       < 1.0.1-r1     >= 1.0.1-r1
  5  x11-base/xorg-x11                      < 6.9.0-r2    *>= 6.8.2-r8
                                                           >= 6.9.0-r2
  6  x11-base/xorg-server                   < 1.1.0-r1    *>= 1.0.2-r6
                                                           >= 1.1.0-r1
  7  x11-libs/libx11                        < 1.0.1-r1     >= 1.0.1-r1
  8  x11-libs/xtrans                        < 1.0.0-r1     >= 1.0.0-r1
  9  x11-terms/xterm                           < 215            >= 215
 10  app-emulation/emul-linux-x86-xlibs      < 7.0-r2        >= 7.0-r2
    -------------------------------------------------------------------
     # Package 10 [app-emulation/emul-linux-x86-xlibs] only applies to
       AMD64 users.

     NOTE: Any packages listed without architecture tags apply to all
          architectures...
    -------------------------------------------------------------------
     10 affected packages
    -------------------------------------------------------------------

Description
===========

Several X.org libraries and X.org itself contain system calls to
set*uid() functions, without checking their result.

Impact
======

Local users could deliberately exceed their assigned resource limits
and elevate their privileges after an unsuccessful set*uid() system
call. This requires resource limits to be enabled on the machine.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All X.Org xdm users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=x11-apps/xdm-1.0.4-r1"

All X.Org xinit users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=x11-apps/xinit-1.0.2-r6"

All X.Org xload users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=x11-apps/xload-1.0.1-r1"

All X.Org xf86dga users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=x11-apps/xf86dga-1.0.1-r1"

All X.Org users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=x11-base/xorg-x11-6.9.0-r2"

All X.Org X servers users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.1.0-r1"

All X.Org X11 library users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=x11-libs/libx11-1.0.1-r1"

All X.Org xtrans library users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=x11-libs/xtrans-1.0.1-r1"

All xterm users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=x11-terms/xterm-215"

All users of the X11R6 libraries for emulation of 32bit x86 on amd64
should upgrade to the latest version:

    # emerge --sync
    # 
emerge --ask --oneshot --verbose ">=app-emulation/emul-linux-x86-xlibs-7.0-r2"

Please note that the fixed packages have been available for most
architectures since June 30th but the GLSA release was held up waiting
for the remaining architectures.

References
==========

  [ 1 ] X.Org security advisory
        http://lists.freedesktop.org/archives/xorg/2006-June/016146.html

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200608-25.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security () gentoo org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2006 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5

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