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Category:   Application (Generic)  >   libXfont Vendors:   X.org
(Red Hat Issues Fix) libXfont Buffer Overflows Let Remote and Local Users Execute Arbitrary Code
SecurityTracker Alert ID:  1031256
SecurityTracker URL:  http://securitytracker.com/id/1031256
CVE Reference:   CVE-2014-0209, CVE-2014-0210, CVE-2014-0211   (Links to External Site)
Date:  Nov 25 2014
Impact:   Execution of arbitrary code via local system, Execution of arbitrary code via network, User access via local system, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to versions 1.4.8, 1.4.99.901, and 1.5.0 RC 1
Description:   Several vulnerabilities were reported in libXfont. A remote or local user can cause arbitrary code to be executed on the target user's system.

A local user can create specially crafted 'fonts.dir' and 'fonts.alias' files to trigger a heap overflow [CVE-2014-0209].

A remote font server can return a specially crafted XFS protocol message to trigger a memory overflow [CVE-2014-0210].

Certain functions do not properly check for buffer overflows [CVE-2014-0211]. The fs_get_reply(), fs_alloc_glyphs(), and fs_read_extent_info() functions are affected.

Ilja van Sprundel from IOActive reported these vulnerabilities.

Impact:   A remote or local user can execute arbitrary code on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2014-1893.html

Vendor URL:  x.org/ (Links to External Site)
Cause:   Access control error, Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5

Message History:   This archive entry is a follow-up to the message listed below.
May 14 2014 libXfont Buffer Overflows Let Remote and Local Users Execute Arbitrary Code



 Source Message Contents

Subject:  [RHSA-2014:1893-01] Important: libXfont security update

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

Synopsis:          Important: libXfont security update
Advisory ID:       RHSA-2014:1893-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2014-1893.html
Issue date:        2014-11-24
CVE Names:         CVE-2014-0209 CVE-2014-0210 CVE-2014-0211 
=====================================================================

1. Summary:

Updated libXfont packages that fix three security issues are now available
for Red Hat Enterprise Linux 5.

Red Hat Product Security has rated this update as having Important security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.

2. Relevant releases/architectures:

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

3. Description:

The libXfont packages provide the X.Org libXfont runtime library. X.Org is
an open source implementation of the X Window System.

A use-after-free flaw was found in the way libXfont processed certain font
files when attempting to add a new directory to the font path. A malicious,
local user could exploit this issue to potentially execute arbitrary code
with the privileges of the X.Org server. (CVE-2014-0209)

Multiple out-of-bounds write flaws were found in the way libXfont parsed
replies received from an X.org font server. A malicious X.org server could
cause an X client to crash or, possibly, execute arbitrary code with the
privileges of the X.Org server. (CVE-2014-0210, CVE-2014-0211)

Red Hat would like to thank the X.org project for reporting these issues.
Upstream acknowledges Ilja van Sprundel as the original reporter.

Users of libXfont should upgrade to these updated packages, which contain a
backported patch to resolve this issue. All running X.Org server instances
must be restarted for the update to take effect.

4. Solution:

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

This update is available via the Red Hat Network. Details on how to use the
Red Hat Network to apply this update are available at
https://access.redhat.com/articles/11258

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

1096593 - CVE-2014-0209 libXfont: integer overflow of allocations in font metadata file parsing
1096597 - CVE-2014-0210 libXfont: unvalidated length fields when parsing xfs protocol replies
1096601 - CVE-2014-0211 libXfont: integer overflows calculating memory needs for xfs replies

6. Package List:

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

Source:
libXfont-1.2.2-1.0.6.el5_11.src.rpm

i386:
libXfont-1.2.2-1.0.6.el5_11.i386.rpm
libXfont-debuginfo-1.2.2-1.0.6.el5_11.i386.rpm

x86_64:
libXfont-1.2.2-1.0.6.el5_11.i386.rpm
libXfont-1.2.2-1.0.6.el5_11.x86_64.rpm
libXfont-debuginfo-1.2.2-1.0.6.el5_11.i386.rpm
libXfont-debuginfo-1.2.2-1.0.6.el5_11.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
libXfont-1.2.2-1.0.6.el5_11.src.rpm

i386:
libXfont-debuginfo-1.2.2-1.0.6.el5_11.i386.rpm
libXfont-devel-1.2.2-1.0.6.el5_11.i386.rpm

x86_64:
libXfont-debuginfo-1.2.2-1.0.6.el5_11.i386.rpm
libXfont-debuginfo-1.2.2-1.0.6.el5_11.x86_64.rpm
libXfont-devel-1.2.2-1.0.6.el5_11.i386.rpm
libXfont-devel-1.2.2-1.0.6.el5_11.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
libXfont-1.2.2-1.0.6.el5_11.src.rpm

i386:
libXfont-1.2.2-1.0.6.el5_11.i386.rpm
libXfont-debuginfo-1.2.2-1.0.6.el5_11.i386.rpm
libXfont-devel-1.2.2-1.0.6.el5_11.i386.rpm

ia64:
libXfont-1.2.2-1.0.6.el5_11.ia64.rpm
libXfont-debuginfo-1.2.2-1.0.6.el5_11.ia64.rpm
libXfont-devel-1.2.2-1.0.6.el5_11.ia64.rpm

ppc:
libXfont-1.2.2-1.0.6.el5_11.ppc.rpm
libXfont-1.2.2-1.0.6.el5_11.ppc64.rpm
libXfont-debuginfo-1.2.2-1.0.6.el5_11.ppc.rpm
libXfont-debuginfo-1.2.2-1.0.6.el5_11.ppc64.rpm
libXfont-devel-1.2.2-1.0.6.el5_11.ppc.rpm
libXfont-devel-1.2.2-1.0.6.el5_11.ppc64.rpm

s390x:
libXfont-1.2.2-1.0.6.el5_11.s390.rpm
libXfont-1.2.2-1.0.6.el5_11.s390x.rpm
libXfont-debuginfo-1.2.2-1.0.6.el5_11.s390.rpm
libXfont-debuginfo-1.2.2-1.0.6.el5_11.s390x.rpm
libXfont-devel-1.2.2-1.0.6.el5_11.s390.rpm
libXfont-devel-1.2.2-1.0.6.el5_11.s390x.rpm

x86_64:
libXfont-1.2.2-1.0.6.el5_11.i386.rpm
libXfont-1.2.2-1.0.6.el5_11.x86_64.rpm
libXfont-debuginfo-1.2.2-1.0.6.el5_11.i386.rpm
libXfont-debuginfo-1.2.2-1.0.6.el5_11.x86_64.rpm
libXfont-devel-1.2.2-1.0.6.el5_11.i386.rpm
libXfont-devel-1.2.2-1.0.6.el5_11.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://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2014-0209
https://access.redhat.com/security/cve/CVE-2014-0210
https://access.redhat.com/security/cve/CVE-2014-0211
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2014 Red Hat, Inc.
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