X.org and some X.org libraries: Local privilege escalations

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Gentoo Linux Security Advisory                          
GLSA 200608-25
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                                            http://security.gentoo.or
g/
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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:

  ht
tp://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
securitygentoo.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