libtiff security update

CentOS Errata and Security Advisory CESA-2009:1159

The libtiff packages contain a library of functions for manipulating Tagged
Image File Format (TIFF) files.

Several integer overflow flaws, leading to heap-based buffer overflows,
were found in various libtiff color space conversion tools. An attacker
could create a specially-crafted TIFF file, which once opened by an
unsuspecting user, would cause the conversion tool to crash or,
potentially, execute arbitrary code with the privileges of the user running
the tool. (CVE-2009-2347)

A buffer underwrite flaw was found in libtiff’s Lempel-Ziv-Welch (LZW)
compression algorithm decoder. An attacker could create a specially-crafted
LZW-encoded TIFF file, which once opened by an unsuspecting user, would
cause an application linked with libtiff to access an out-of-bounds memory
location, leading to a denial of service (application crash).
(CVE-2009-2285)

The CVE-2009-2347 flaws were discovered by Tielei Wang from ICST-ERCIS,
Peking University.

All libtiff users should upgrade to these updated packages, which contain
backported patches to correct these issues. After installing this update,
all applications linked with the libtiff library (such as Konqueror) must
be restarted for the update to take effect.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2009-July/078198.html
https://lists.centos.org/pipermail/centos-announce/2009-July/078199.html
https://lists.centos.org/pipermail/centos-announce/2009-July/078204.html
https://lists.centos.org/pipermail/centos-announce/2009-July/078205.html

Affected packages:
libtiff
libtiff-devel

Upstream details at:
https://access.redhat.com/errata/RHSA-2009:1159