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Category:   Application (Generic)  >   libXfont Vendors:   X.org
(Red Hat Issues Fix) libXfont Font Processing Flaws Lets Local Users Deny Service or Gain Elevated Privileges
SecurityTracker Alert ID:  1033461
SecurityTracker URL:  http://securitytracker.com/id/1033461
CVE Reference:   CVE-2015-1802, CVE-2015-1803, CVE-2015-1804   (Links to External Site)
Date:  Sep 3 2015
Impact:   Denial of service via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Several vulnerabilities were reported in libXfont. A local user can obtain elevated privileges on the target system.

A local user with access to the X server can cause the X server to read an arbitrary font file to trigger a memory corruption error and cause denial of service conditions or execute arbitrary code on the target system with the privileges of the X server (which may be root privileges on some systems).

An overflow may occur in bdfReadProperties() in the property count [CVE-2015-1802].

An invalid pointer error may cause a crash in bdfReadCharacters() [CVE-2015-1803].

An overflow may occur in bdfReadCharacters() [CVE-2015-1804].

Ilja van Sprundel of IOActive, Alan Coopersmith of Oracle, and William Robinet of Conostix reported these vulnerabilities.

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

A local user can cause the X server to crash.

Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2015-1708.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2015-1708.html (Links to External Site)
Cause:   Access control error, Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6, 7

Message History:   This archive entry is a follow-up to the message listed below.
Mar 17 2015 libXfont Font Processing Flaws Lets Local Users Deny Service or Gain Elevated Privileges



 Source Message Contents

Subject:  [RHSA-2015:1708-01] Important: libXfont security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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

Synopsis:          Important: libXfont security update
Advisory ID:       RHSA-2015:1708-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-1708.html
Issue date:        2015-09-03
CVE Names:         CVE-2015-1802 CVE-2015-1803 CVE-2015-1804 
=====================================================================

1. Summary:

An updated libXfont package that fixes three security issues is now
available for Red Hat Enterprise Linux 6 and 7.

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:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

3. Description:

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

An integer overflow flaw was found in the way libXfont processed certain
Glyph Bitmap Distribution Format (BDF) fonts. A malicious, local user could
use this flaw to crash the X.Org server or, potentially, execute arbitrary
code with the privileges of the X.Org server. (CVE-2015-1802)

An integer truncation flaw was discovered in the way libXfont processed
certain Glyph Bitmap Distribution Format (BDF) fonts. A malicious, local
user could use this flaw to crash the X.Org server or, potentially, execute
arbitrary code with the privileges of the X.Org server. (CVE-2015-1804)

A NULL pointer dereference flaw was discovered in the way libXfont
processed certain Glyph Bitmap Distribution Format (BDF) fonts.
A malicious, local user could use this flaw to crash the X.Org server.
(CVE-2015-1803)

All libXfont users are advised to upgrade to this updated package, which
contains backported patches to correct these issues.

4. Solution:

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

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

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

1203715 - CVE-2015-1802 libXfont: missing range check in bdfReadProperties
1203718 - CVE-2015-1803 libXfont: crash on invalid read in bdfReadCharacters
1203719 - CVE-2015-1804 libXfont: out-of-bounds memory access in bdfReadCharacters

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
libXfont-1.4.5-5.el6_7.src.rpm

i386:
libXfont-1.4.5-5.el6_7.i686.rpm
libXfont-debuginfo-1.4.5-5.el6_7.i686.rpm

x86_64:
libXfont-1.4.5-5.el6_7.x86_64.rpm
libXfont-debuginfo-1.4.5-5.el6_7.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

i386:
libXfont-debuginfo-1.4.5-5.el6_7.i686.rpm
libXfont-devel-1.4.5-5.el6_7.i686.rpm

x86_64:
libXfont-1.4.5-5.el6_7.i686.rpm
libXfont-debuginfo-1.4.5-5.el6_7.i686.rpm
libXfont-debuginfo-1.4.5-5.el6_7.x86_64.rpm
libXfont-devel-1.4.5-5.el6_7.i686.rpm
libXfont-devel-1.4.5-5.el6_7.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
libXfont-1.4.5-5.el6_7.src.rpm

x86_64:
libXfont-1.4.5-5.el6_7.x86_64.rpm
libXfont-debuginfo-1.4.5-5.el6_7.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

x86_64:
libXfont-1.4.5-5.el6_7.i686.rpm
libXfont-debuginfo-1.4.5-5.el6_7.i686.rpm
libXfont-debuginfo-1.4.5-5.el6_7.x86_64.rpm
libXfont-devel-1.4.5-5.el6_7.i686.rpm
libXfont-devel-1.4.5-5.el6_7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
libXfont-1.4.5-5.el6_7.src.rpm

i386:
libXfont-1.4.5-5.el6_7.i686.rpm
libXfont-debuginfo-1.4.5-5.el6_7.i686.rpm

ppc64:
libXfont-1.4.5-5.el6_7.ppc64.rpm
libXfont-debuginfo-1.4.5-5.el6_7.ppc64.rpm

s390x:
libXfont-1.4.5-5.el6_7.s390x.rpm
libXfont-debuginfo-1.4.5-5.el6_7.s390x.rpm

x86_64:
libXfont-1.4.5-5.el6_7.x86_64.rpm
libXfont-debuginfo-1.4.5-5.el6_7.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

i386:
libXfont-debuginfo-1.4.5-5.el6_7.i686.rpm
libXfont-devel-1.4.5-5.el6_7.i686.rpm

ppc64:
libXfont-1.4.5-5.el6_7.ppc.rpm
libXfont-debuginfo-1.4.5-5.el6_7.ppc.rpm
libXfont-debuginfo-1.4.5-5.el6_7.ppc64.rpm
libXfont-devel-1.4.5-5.el6_7.ppc.rpm
libXfont-devel-1.4.5-5.el6_7.ppc64.rpm

s390x:
libXfont-1.4.5-5.el6_7.s390.rpm
libXfont-debuginfo-1.4.5-5.el6_7.s390.rpm
libXfont-debuginfo-1.4.5-5.el6_7.s390x.rpm
libXfont-devel-1.4.5-5.el6_7.s390.rpm
libXfont-devel-1.4.5-5.el6_7.s390x.rpm

x86_64:
libXfont-1.4.5-5.el6_7.i686.rpm
libXfont-debuginfo-1.4.5-5.el6_7.i686.rpm
libXfont-debuginfo-1.4.5-5.el6_7.x86_64.rpm
libXfont-devel-1.4.5-5.el6_7.i686.rpm
libXfont-devel-1.4.5-5.el6_7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
libXfont-1.4.5-5.el6_7.src.rpm

i386:
libXfont-1.4.5-5.el6_7.i686.rpm
libXfont-debuginfo-1.4.5-5.el6_7.i686.rpm

x86_64:
libXfont-1.4.5-5.el6_7.x86_64.rpm
libXfont-debuginfo-1.4.5-5.el6_7.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

i386:
libXfont-debuginfo-1.4.5-5.el6_7.i686.rpm
libXfont-devel-1.4.5-5.el6_7.i686.rpm

x86_64:
libXfont-1.4.5-5.el6_7.i686.rpm
libXfont-debuginfo-1.4.5-5.el6_7.i686.rpm
libXfont-debuginfo-1.4.5-5.el6_7.x86_64.rpm
libXfont-devel-1.4.5-5.el6_7.i686.rpm
libXfont-devel-1.4.5-5.el6_7.x86_64.rpm

Red Hat Enterprise Linux Client (v. 7):

Source:
libXfont-1.4.7-3.el7_1.src.rpm

x86_64:
libXfont-1.4.7-3.el7_1.i686.rpm
libXfont-1.4.7-3.el7_1.x86_64.rpm
libXfont-debuginfo-1.4.7-3.el7_1.i686.rpm
libXfont-debuginfo-1.4.7-3.el7_1.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
libXfont-debuginfo-1.4.7-3.el7_1.i686.rpm
libXfont-debuginfo-1.4.7-3.el7_1.x86_64.rpm
libXfont-devel-1.4.7-3.el7_1.i686.rpm
libXfont-devel-1.4.7-3.el7_1.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
libXfont-1.4.7-3.el7_1.src.rpm

x86_64:
libXfont-1.4.7-3.el7_1.i686.rpm
libXfont-1.4.7-3.el7_1.x86_64.rpm
libXfont-debuginfo-1.4.7-3.el7_1.i686.rpm
libXfont-debuginfo-1.4.7-3.el7_1.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
libXfont-debuginfo-1.4.7-3.el7_1.i686.rpm
libXfont-debuginfo-1.4.7-3.el7_1.x86_64.rpm
libXfont-devel-1.4.7-3.el7_1.i686.rpm
libXfont-devel-1.4.7-3.el7_1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
libXfont-1.4.7-3.el7_1.src.rpm

ppc64:
libXfont-1.4.7-3.el7_1.ppc.rpm
libXfont-1.4.7-3.el7_1.ppc64.rpm
libXfont-debuginfo-1.4.7-3.el7_1.ppc.rpm
libXfont-debuginfo-1.4.7-3.el7_1.ppc64.rpm

s390x:
libXfont-1.4.7-3.el7_1.s390.rpm
libXfont-1.4.7-3.el7_1.s390x.rpm
libXfont-debuginfo-1.4.7-3.el7_1.s390.rpm
libXfont-debuginfo-1.4.7-3.el7_1.s390x.rpm

x86_64:
libXfont-1.4.7-3.el7_1.i686.rpm
libXfont-1.4.7-3.el7_1.x86_64.rpm
libXfont-debuginfo-1.4.7-3.el7_1.i686.rpm
libXfont-debuginfo-1.4.7-3.el7_1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
libXfont-1.4.7-3.ael7b_1.src.rpm

ppc64le:
libXfont-1.4.7-3.ael7b_1.ppc64le.rpm
libXfont-debuginfo-1.4.7-3.ael7b_1.ppc64le.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

ppc64:
libXfont-debuginfo-1.4.7-3.el7_1.ppc.rpm
libXfont-debuginfo-1.4.7-3.el7_1.ppc64.rpm
libXfont-devel-1.4.7-3.el7_1.ppc.rpm
libXfont-devel-1.4.7-3.el7_1.ppc64.rpm

s390x:
libXfont-debuginfo-1.4.7-3.el7_1.s390.rpm
libXfont-debuginfo-1.4.7-3.el7_1.s390x.rpm
libXfont-devel-1.4.7-3.el7_1.s390.rpm
libXfont-devel-1.4.7-3.el7_1.s390x.rpm

x86_64:
libXfont-debuginfo-1.4.7-3.el7_1.i686.rpm
libXfont-debuginfo-1.4.7-3.el7_1.x86_64.rpm
libXfont-devel-1.4.7-3.el7_1.i686.rpm
libXfont-devel-1.4.7-3.el7_1.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

ppc64le:
libXfont-debuginfo-1.4.7-3.ael7b_1.ppc64le.rpm
libXfont-devel-1.4.7-3.ael7b_1.ppc64le.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
libXfont-1.4.7-3.el7_1.src.rpm

x86_64:
libXfont-1.4.7-3.el7_1.i686.rpm
libXfont-1.4.7-3.el7_1.x86_64.rpm
libXfont-debuginfo-1.4.7-3.el7_1.i686.rpm
libXfont-debuginfo-1.4.7-3.el7_1.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
libXfont-debuginfo-1.4.7-3.el7_1.i686.rpm
libXfont-debuginfo-1.4.7-3.el7_1.x86_64.rpm
libXfont-devel-1.4.7-3.el7_1.i686.rpm
libXfont-devel-1.4.7-3.el7_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://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2015-1802
https://access.redhat.com/security/cve/CVE-2015-1803
https://access.redhat.com/security/cve/CVE-2015-1804
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 2015 Red Hat, Inc.
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