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Category:   Application (Generic)  >   FreeType Vendors:   freetype.org
(Red Hat Issues Fix for FreeType) libXfont Heap Overflow in LZW Decompresser Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1025932
SecurityTracker URL:  http://securitytracker.com/id/1025932
CVE Reference:   CVE-2011-2895   (Links to External Site)
Date:  Aug 15 2011
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in libXfont. A remote user can cause arbitrary code to be executed on the target user's system. FreeType is affected.

A remote user can create a specially crafted LZW stream that, when processed by the target user or application, will trigger a heap overflow in the LZW decompresser and execute arbitrary code on the target system. The code will run with the privileges of the target user or application.

Impact:   A remote user can create a file that, when processed by the target user or application, will execute arbitrary code on the target system.
Solution:   Red Hat has issued a fix for FreeType.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2011-1161.html

Cause:   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.
Aug 11 2011 libXfont Heap Overflow in LZW Decompresser Lets Remote Users Execute Arbitrary Code



 Source Message Contents

Subject:  [RHSA-2011:1161-01] Moderate: freetype security update

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

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

Synopsis:          Moderate: freetype security update
Advisory ID:       RHSA-2011:1161-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2011-1161.html
Issue date:        2011-08-15
CVE Names:         CVE-2011-2895 
=====================================================================

1. Summary:

Updated freetype packages that fix one security issue are now available for
Red Hat Enterprise Linux 4.

The Red Hat Security Response Team has rated this update as having moderate
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 AS version 4 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Enterprise Linux Desktop version 4 - i386, x86_64
Red Hat Enterprise Linux ES version 4 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 4 - i386, ia64, x86_64

3. Description:

FreeType is a free, high-quality, portable font engine that can open and
manage font files. It also loads, hints, and renders individual glyphs
efficiently. These packages provide both the FreeType 1 and FreeType 2 font
engines.

A buffer overflow flaw was found in the way the FreeType library handled
malformed font files compressed using UNIX compress. If a user loaded a
specially-crafted compressed font file with an application linked against
FreeType, it could cause the application to crash or, possibly, execute
arbitrary code with the privileges of the user running the application.
(CVE-2011-2895)

Note: This issue only affects the FreeType 2 font engine.

Users are advised to upgrade to these updated packages, which contain a
backported patch to correct this issue. The X server must be restarted (log
out, then log back in) for this 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/):

727624 - CVE-2011-2895 BSD compress LZW decoder buffer overflow

6. Package List:

Red Hat Enterprise Linux AS version 4:

Source:
ftp://updates.redhat.com/enterprise/4AS/en/os/SRPMS/freetype-2.1.9-19.el4.src.rpm

i386:
freetype-2.1.9-19.el4.i386.rpm
freetype-debuginfo-2.1.9-19.el4.i386.rpm
freetype-demos-2.1.9-19.el4.i386.rpm
freetype-devel-2.1.9-19.el4.i386.rpm
freetype-utils-2.1.9-19.el4.i386.rpm

ia64:
freetype-2.1.9-19.el4.i386.rpm
freetype-2.1.9-19.el4.ia64.rpm
freetype-debuginfo-2.1.9-19.el4.i386.rpm
freetype-debuginfo-2.1.9-19.el4.ia64.rpm
freetype-demos-2.1.9-19.el4.ia64.rpm
freetype-devel-2.1.9-19.el4.ia64.rpm
freetype-utils-2.1.9-19.el4.ia64.rpm

ppc:
freetype-2.1.9-19.el4.ppc.rpm
freetype-2.1.9-19.el4.ppc64.rpm
freetype-debuginfo-2.1.9-19.el4.ppc.rpm
freetype-debuginfo-2.1.9-19.el4.ppc64.rpm
freetype-demos-2.1.9-19.el4.ppc.rpm
freetype-devel-2.1.9-19.el4.ppc.rpm
freetype-utils-2.1.9-19.el4.ppc.rpm

s390:
freetype-2.1.9-19.el4.s390.rpm
freetype-debuginfo-2.1.9-19.el4.s390.rpm
freetype-demos-2.1.9-19.el4.s390.rpm
freetype-devel-2.1.9-19.el4.s390.rpm
freetype-utils-2.1.9-19.el4.s390.rpm

s390x:
freetype-2.1.9-19.el4.s390.rpm
freetype-2.1.9-19.el4.s390x.rpm
freetype-debuginfo-2.1.9-19.el4.s390.rpm
freetype-debuginfo-2.1.9-19.el4.s390x.rpm
freetype-demos-2.1.9-19.el4.s390x.rpm
freetype-devel-2.1.9-19.el4.s390x.rpm
freetype-utils-2.1.9-19.el4.s390x.rpm

x86_64:
freetype-2.1.9-19.el4.i386.rpm
freetype-2.1.9-19.el4.x86_64.rpm
freetype-debuginfo-2.1.9-19.el4.i386.rpm
freetype-debuginfo-2.1.9-19.el4.x86_64.rpm
freetype-demos-2.1.9-19.el4.x86_64.rpm
freetype-devel-2.1.9-19.el4.x86_64.rpm
freetype-utils-2.1.9-19.el4.x86_64.rpm

Red Hat Enterprise Linux Desktop version 4:

Source:
ftp://updates.redhat.com/enterprise/4Desktop/en/os/SRPMS/freetype-2.1.9-19.el4.src.rpm

i386:
freetype-2.1.9-19.el4.i386.rpm
freetype-debuginfo-2.1.9-19.el4.i386.rpm
freetype-demos-2.1.9-19.el4.i386.rpm
freetype-devel-2.1.9-19.el4.i386.rpm
freetype-utils-2.1.9-19.el4.i386.rpm

x86_64:
freetype-2.1.9-19.el4.i386.rpm
freetype-2.1.9-19.el4.x86_64.rpm
freetype-debuginfo-2.1.9-19.el4.i386.rpm
freetype-debuginfo-2.1.9-19.el4.x86_64.rpm
freetype-demos-2.1.9-19.el4.x86_64.rpm
freetype-devel-2.1.9-19.el4.x86_64.rpm
freetype-utils-2.1.9-19.el4.x86_64.rpm

Red Hat Enterprise Linux ES version 4:

Source:
ftp://updates.redhat.com/enterprise/4ES/en/os/SRPMS/freetype-2.1.9-19.el4.src.rpm

i386:
freetype-2.1.9-19.el4.i386.rpm
freetype-debuginfo-2.1.9-19.el4.i386.rpm
freetype-demos-2.1.9-19.el4.i386.rpm
freetype-devel-2.1.9-19.el4.i386.rpm
freetype-utils-2.1.9-19.el4.i386.rpm

ia64:
freetype-2.1.9-19.el4.i386.rpm
freetype-2.1.9-19.el4.ia64.rpm
freetype-debuginfo-2.1.9-19.el4.i386.rpm
freetype-debuginfo-2.1.9-19.el4.ia64.rpm
freetype-demos-2.1.9-19.el4.ia64.rpm
freetype-devel-2.1.9-19.el4.ia64.rpm
freetype-utils-2.1.9-19.el4.ia64.rpm

x86_64:
freetype-2.1.9-19.el4.i386.rpm
freetype-2.1.9-19.el4.x86_64.rpm
freetype-debuginfo-2.1.9-19.el4.i386.rpm
freetype-debuginfo-2.1.9-19.el4.x86_64.rpm
freetype-demos-2.1.9-19.el4.x86_64.rpm
freetype-devel-2.1.9-19.el4.x86_64.rpm
freetype-utils-2.1.9-19.el4.x86_64.rpm

Red Hat Enterprise Linux WS version 4:

Source:
ftp://updates.redhat.com/enterprise/4WS/en/os/SRPMS/freetype-2.1.9-19.el4.src.rpm

i386:
freetype-2.1.9-19.el4.i386.rpm
freetype-debuginfo-2.1.9-19.el4.i386.rpm
freetype-demos-2.1.9-19.el4.i386.rpm
freetype-devel-2.1.9-19.el4.i386.rpm
freetype-utils-2.1.9-19.el4.i386.rpm

ia64:
freetype-2.1.9-19.el4.i386.rpm
freetype-2.1.9-19.el4.ia64.rpm
freetype-debuginfo-2.1.9-19.el4.i386.rpm
freetype-debuginfo-2.1.9-19.el4.ia64.rpm
freetype-demos-2.1.9-19.el4.ia64.rpm
freetype-devel-2.1.9-19.el4.ia64.rpm
freetype-utils-2.1.9-19.el4.ia64.rpm

x86_64:
freetype-2.1.9-19.el4.i386.rpm
freetype-2.1.9-19.el4.x86_64.rpm
freetype-debuginfo-2.1.9-19.el4.i386.rpm
freetype-debuginfo-2.1.9-19.el4.x86_64.rpm
freetype-demos-2.1.9-19.el4.x86_64.rpm
freetype-devel-2.1.9-19.el4.x86_64.rpm
freetype-utils-2.1.9-19.el4.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/#moderate

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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