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

Synopsis:          Moderate: libpng security update
Advisory ID:       RHSA-2011:1104-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2011-1104.html
Issue date:        2011-07-28
CVE Names:         CVE-2011-2690 CVE-2011-2692 
=====================================================================

1. Summary:

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

The Red Hat Security Response Team has rated this update as having moderate
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 libpng packages contain a library of functions for creating and
manipulating PNG (Portable Network Graphics) image format files.

A buffer overflow flaw was found in the way libpng processed certain PNG
image files. An attacker could create a specially-crafted PNG image that,
when opened, could cause an application using libpng to crash or,
potentially, execute arbitrary code with the privileges of the user running
the application. (CVE-2011-2690)

Note: The application behavior required to exploit CVE-2011-2690 is rarely
used. No application shipped with Red Hat Enterprise Linux behaves this
way, for example.

An uninitialized memory read issue was found in the way libpng processed
certain PNG images that use the Physical Scale (sCAL) extension. An
attacker could create a specially-crafted PNG image that, when opened,
could cause an application using libpng to crash. (CVE-2011-2692)

Users of libpng should upgrade to these updated packages, which contain
backported patches to correct these issues. All running applications using
libpng 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/):

720607 - CVE-2011-2690 libpng: buffer overwrite in png_rgb_to_gray
720612 - CVE-2011-2692 libpng: Invalid read when handling empty sCAL chunks

6. Package List:

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/libpng-1.2.10-7.1.el5_7.5.src.rpm

i386:
libpng-1.2.10-7.1.el5_7.5.i386.rpm
libpng-debuginfo-1.2.10-7.1.el5_7.5.i386.rpm

x86_64:
libpng-1.2.10-7.1.el5_7.5.i386.rpm
libpng-1.2.10-7.1.el5_7.5.x86_64.rpm
libpng-debuginfo-1.2.10-7.1.el5_7.5.i386.rpm
libpng-debuginfo-1.2.10-7.1.el5_7.5.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/libpng-1.2.10-7.1.el5_7.5.src.rpm

i386:
libpng-debuginfo-1.2.10-7.1.el5_7.5.i386.rpm
libpng-devel-1.2.10-7.1.el5_7.5.i386.rpm

x86_64:
libpng-debuginfo-1.2.10-7.1.el5_7.5.i386.rpm
libpng-debuginfo-1.2.10-7.1.el5_7.5.x86_64.rpm
libpng-devel-1.2.10-7.1.el5_7.5.i386.rpm
libpng-devel-1.2.10-7.1.el5_7.5.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/libpng-1.2.10-7.1.el5_7.5.src.rpm

i386:
libpng-1.2.10-7.1.el5_7.5.i386.rpm
libpng-debuginfo-1.2.10-7.1.el5_7.5.i386.rpm
libpng-devel-1.2.10-7.1.el5_7.5.i386.rpm

ia64:
libpng-1.2.10-7.1.el5_7.5.i386.rpm
libpng-1.2.10-7.1.el5_7.5.ia64.rpm
libpng-debuginfo-1.2.10-7.1.el5_7.5.i386.rpm
libpng-debuginfo-1.2.10-7.1.el5_7.5.ia64.rpm
libpng-devel-1.2.10-7.1.el5_7.5.ia64.rpm

ppc:
libpng-1.2.10-7.1.el5_7.5.ppc.rpm
libpng-1.2.10-7.1.el5_7.5.ppc64.rpm
libpng-debuginfo-1.2.10-7.1.el5_7.5.ppc.rpm
libpng-debuginfo-1.2.10-7.1.el5_7.5.ppc64.rpm
libpng-devel-1.2.10-7.1.el5_7.5.ppc.rpm
libpng-devel-1.2.10-7.1.el5_7.5.ppc64.rpm

s390x:
libpng-1.2.10-7.1.el5_7.5.s390.rpm
libpng-1.2.10-7.1.el5_7.5.s390x.rpm
libpng-debuginfo-1.2.10-7.1.el5_7.5.s390.rpm
libpng-debuginfo-1.2.10-7.1.el5_7.5.s390x.rpm
libpng-devel-1.2.10-7.1.el5_7.5.s390.rpm
libpng-devel-1.2.10-7.1.el5_7.5.s390x.rpm

x86_64:
libpng-1.2.10-7.1.el5_7.5.i386.rpm
libpng-1.2.10-7.1.el5_7.5.x86_64.rpm
libpng-debuginfo-1.2.10-7.1.el5_7.5.i386.rpm
libpng-debuginfo-1.2.10-7.1.el5_7.5.x86_64.rpm
libpng-devel-1.2.10-7.1.el5_7.5.i386.rpm
libpng-devel-1.2.10-7.1.el5_7.5.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-2011-2690.html
https://www.redhat.com/security/data/cve/CVE-2011-2692.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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