SecurityTracker.com
    Home    |    View Topics    |    Search    |    Contact Us    |   

SecurityTracker
Archives


 


Category:   Application (Generic)  >   libXfont Vendors:   X.org
(Red Hat Issues Fix) libXfont Heap Overflow in LZW Decompresser Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1026439
SecurityTracker URL:  http://securitytracker.com/id/1026439
CVE Reference:   CVE-2011-2895   (Links to External Site)
Date:  Dec 20 2011
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 1.4.4
Description:   A vulnerability was reported in libXfont. A remote user can cause arbitrary code to be executed on the target user's system.

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.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2011-1834.html

Vendor URL:  lists.freedesktop.org/archives/xorg-announce/2011-August/001721.html (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5.6

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-2011:1834-01] Important: libXfont security update

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

=====================================================================
                   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.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.4 (GNU/Linux)

iD8DBQFO73oMXlSAg2UNWIIRAj4LAJ43n6u1Lyx6vwNXXIE73fZqhkxY+wCfczOB
rytkNzMIXMGbtriCc9sjNQc=
=qjpf
-----END PGP SIGNATURE-----


-- 
Enterprise-watch-list mailing list
Enterprise-watch-list@redhat.com
https://www.redhat.com/mailman/listinfo/enterprise-watch-list
 
 


Go to the Top of This SecurityTracker Archive Page





Home   |    View Topics   |    Search   |    Contact Us

This web site uses cookies for web analytics. Learn More

Copyright 2022, SecurityGlobal.net LLC