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Category:   Application (Game)  >   libXfont Vendors:   X.org
(Red Hat Issues Fix for libXfont) X Server Bugs in XFree86, Xinput, TOG-CUP, MIT-SHM, and EVI Extensions Let Local Users Gain Root Privileges
SecurityTracker Alert ID:  1019236
SecurityTracker URL:  http://securitytracker.com/id/1019236
CVE Reference:   CVE-2008-0006   (Links to External Site)
Date:  Jan 18 2008
Impact:   Disclosure of system information, Disclosure of user information, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Several vulnerabilities were reported in X. A local user can obtain root privileges on the target system. A local user can determine whether certain files or directories exist on the target system.

A local user can exploit any of several memory corruption errors in the X server to execute arbitrary code with the privileges of the target X server (typically root level privileges).

A local user can supply a specially PassMessage request to cause an out-of-bounds array index error and trigger a pointer dereference in the XFree86 Misc extension [CVE-2007-5760].

A local user can supply a certain type of command ('X :1 -sp <file>') specifying an arbitrary file or directory to identify whether the specified file exists in access-restricted directories based on the error message returned by the system [CVE-2007-5958].

A local user can trigger a heap corruption error in the Xinput extension [CVE-2007-6427].

A local user can read arbitrary memory contents by exploiting the ProcGetReservedColormapEntries() function in the TOG-CUP extension [CVE-2007-6428].

A local user can supply a specially crafted request to trigger an integer overflow in the pixmap creation process in the MIT-SHM and EVI extensions [CVE-2007-6429].

A local user can supply a specially crafted PCF font to trigger a buffer overflow [CVE-2008-0006].

regenrecht reported CVE-2007-5760, CVE-2007-6427, CVE-2007-6428, and CVE-2007-6429 via iDefense. Takuya Shiozaki of CodeBlog reported CVE-2008-0006. An anonymous researcher reported CVE-2007-5859.

Impact:   A local user can obtain root privileges on the target system.

A local user can determine whether files or directories exist on the target system.

Solution:   Red Hat has released a fix for CVE-2008-0006 for libXfont.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2008-0064.html

Vendor URL:  lists.freedesktop.org/archives/xorg/2008-January/031918.html (Links to External Site)
Cause:   Access control error, Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  4

Message History:   This archive entry is a follow-up to the message listed below.
Jan 17 2008 X Server Bugs in XFree86, Xinput, TOG-CUP, MIT-SHM, and EVI Extensions Let Local Users Gain Root Privileges



 Source Message Contents

Subject:  [RHSA-2008:0064-01] Important: libXfont security update


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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: libXfont security update
Advisory ID:       RHSA-2008:0064-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2008-0064.html
Issue date:        2008-01-17
CVE Names:         CVE-2008-0006 
=====================================================================

1. Summary:

An updated X.Org libXfont package that fixes a security issue is now
available for Red Hat Enterprise Linux 5.

This update has been rated as having important security impact by the Red
Hat Security Response Team.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

3. Description:

The libXfont package contains the X.Org X11 libXfont runtime library.

A heap based buffer overflow flaw was found in the way the X.Org server
handled malformed font files. A malicious local user could exploit this
issue to potentially execute arbitrary code with the privileges of the
X.Org server. (CVE-2008-0006)

Users of X.Org libXfont should upgrade to these updated packages, which
contain a backported patch to resolve this issue.

4. Solution:

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.  

This update is available via Red Hat Network.  Details on how to use 
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188

5. Bugs fixed (http://bugzilla.redhat.com/):

428044 - CVE-2008-0006 Xorg / XFree86 PCF font parser buffer overflow

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/libXfont-1.2.2-1.0.3.el5_1.src.rpm

i386:
libXfont-1.2.2-1.0.3.el5_1.i386.rpm
libXfont-debuginfo-1.2.2-1.0.3.el5_1.i386.rpm

x86_64:
libXfont-1.2.2-1.0.3.el5_1.i386.rpm
libXfont-1.2.2-1.0.3.el5_1.x86_64.rpm
libXfont-debuginfo-1.2.2-1.0.3.el5_1.i386.rpm
libXfont-debuginfo-1.2.2-1.0.3.el5_1.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/libXfont-1.2.2-1.0.3.el5_1.src.rpm

i386:
libXfont-debuginfo-1.2.2-1.0.3.el5_1.i386.rpm
libXfont-devel-1.2.2-1.0.3.el5_1.i386.rpm

x86_64:
libXfont-debuginfo-1.2.2-1.0.3.el5_1.i386.rpm
libXfont-debuginfo-1.2.2-1.0.3.el5_1.x86_64.rpm
libXfont-devel-1.2.2-1.0.3.el5_1.i386.rpm
libXfont-devel-1.2.2-1.0.3.el5_1.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/libXfont-1.2.2-1.0.3.el5_1.src.rpm

i386:
libXfont-1.2.2-1.0.3.el5_1.i386.rpm
libXfont-debuginfo-1.2.2-1.0.3.el5_1.i386.rpm
libXfont-devel-1.2.2-1.0.3.el5_1.i386.rpm

ia64:
libXfont-1.2.2-1.0.3.el5_1.ia64.rpm
libXfont-debuginfo-1.2.2-1.0.3.el5_1.ia64.rpm
libXfont-devel-1.2.2-1.0.3.el5_1.ia64.rpm

ppc:
libXfont-1.2.2-1.0.3.el5_1.ppc.rpm
libXfont-1.2.2-1.0.3.el5_1.ppc64.rpm
libXfont-debuginfo-1.2.2-1.0.3.el5_1.ppc.rpm
libXfont-debuginfo-1.2.2-1.0.3.el5_1.ppc64.rpm
libXfont-devel-1.2.2-1.0.3.el5_1.ppc.rpm
libXfont-devel-1.2.2-1.0.3.el5_1.ppc64.rpm

s390x:
libXfont-1.2.2-1.0.3.el5_1.s390.rpm
libXfont-1.2.2-1.0.3.el5_1.s390x.rpm
libXfont-debuginfo-1.2.2-1.0.3.el5_1.s390.rpm
libXfont-debuginfo-1.2.2-1.0.3.el5_1.s390x.rpm
libXfont-devel-1.2.2-1.0.3.el5_1.s390.rpm
libXfont-devel-1.2.2-1.0.3.el5_1.s390x.rpm

x86_64:
libXfont-1.2.2-1.0.3.el5_1.i386.rpm
libXfont-1.2.2-1.0.3.el5_1.x86_64.rpm
libXfont-debuginfo-1.2.2-1.0.3.el5_1.i386.rpm
libXfont-debuginfo-1.2.2-1.0.3.el5_1.x86_64.rpm
libXfont-devel-1.2.2-1.0.3.el5_1.i386.rpm
libXfont-devel-1.2.2-1.0.3.el5_1.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0006
http://www.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2008 Red Hat, Inc.
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