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Red Hat Security Advisory 2011-1834-01

Red Hat Security Advisory 2011-1834-01
Posted Dec 19, 2011
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2011-1834-01 - The libXfont packages provide the X.Org libXfont runtime library. X.Org is an open source implementation of the X Window System. A buffer overflow flaw was found in the way the libXfont library, used by the X.Org server, handled malformed font files compressed using UNIX compress. A malicious, local user could exploit this issue to potentially execute arbitrary code with the privileges of the X.Org server. 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.

tags | advisory, overflow, arbitrary, local
systems | linux, redhat, unix
advisories | CVE-2011-2895
MD5 | 78fad8dcd5573adc0f07e6f8ab3bb323

Red Hat Security Advisory 2011-1834-01

Change Mirror Download
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=====================================================================
Red Hat Security Advisory

Synopsis: Important: libXfont security update
Advisory ID: RHSA-2011:1834-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2011-1834.html
Issue date: 2011-12-19
CVE Names: CVE-2011-2895
=====================================================================

1. Summary:

Updated libXfont packages that fix one security issue are now available for
Red Hat Enterprise Linux 5.6 Extended Update Support.

The Red Hat Security Response Team has rated this update as having
important security impact. A Common Vulnerability Scoring System (CVSS)
base score, which gives a detailed severity rating, is available from the
CVE link in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux EUS (v. 5.6 server) - i386, ia64, ppc, s390x, 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 buffer overflow flaw was found in the way the libXfont library, used by
the X.Org server, handled malformed font files compressed using UNIX
compress. A malicious, local user could exploit this issue to potentially
execute arbitrary code with the privileges of the X.Org server.
(CVE-2011-2895)

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/kb/docs/DOC-11259

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

725760 - CVE-2011-2895 libXfont: LZW decompression heap corruption / infinite loop
727624 - CVE-2011-2895 BSD compress LZW decoder buffer overflow

6. Package List:

Red Hat Enterprise Linux EUS (v. 5.6 server):

Source:
libXfont-1.2.2-1.0.3.el5_6.src.rpm

i386:
libXfont-1.2.2-1.0.3.el5_6.i386.rpm
libXfont-debuginfo-1.2.2-1.0.3.el5_6.i386.rpm
libXfont-devel-1.2.2-1.0.3.el5_6.i386.rpm

ia64:
libXfont-1.2.2-1.0.3.el5_6.ia64.rpm
libXfont-debuginfo-1.2.2-1.0.3.el5_6.ia64.rpm
libXfont-devel-1.2.2-1.0.3.el5_6.ia64.rpm

ppc:
libXfont-1.2.2-1.0.3.el5_6.ppc.rpm
libXfont-1.2.2-1.0.3.el5_6.ppc64.rpm
libXfont-debuginfo-1.2.2-1.0.3.el5_6.ppc.rpm
libXfont-debuginfo-1.2.2-1.0.3.el5_6.ppc64.rpm
libXfont-devel-1.2.2-1.0.3.el5_6.ppc.rpm
libXfont-devel-1.2.2-1.0.3.el5_6.ppc64.rpm

s390x:
libXfont-1.2.2-1.0.3.el5_6.s390.rpm
libXfont-1.2.2-1.0.3.el5_6.s390x.rpm
libXfont-debuginfo-1.2.2-1.0.3.el5_6.s390.rpm
libXfont-debuginfo-1.2.2-1.0.3.el5_6.s390x.rpm
libXfont-devel-1.2.2-1.0.3.el5_6.s390.rpm
libXfont-devel-1.2.2-1.0.3.el5_6.s390x.rpm

x86_64:
libXfont-1.2.2-1.0.3.el5_6.i386.rpm
libXfont-1.2.2-1.0.3.el5_6.x86_64.rpm
libXfont-debuginfo-1.2.2-1.0.3.el5_6.i386.rpm
libXfont-debuginfo-1.2.2-1.0.3.el5_6.x86_64.rpm
libXfont-devel-1.2.2-1.0.3.el5_6.i386.rpm
libXfont-devel-1.2.2-1.0.3.el5_6.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/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2011-2895.html
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 2011 Red Hat, Inc.
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