Moderate: php53 and php security update
Security Advisory: Moderate
Updated php53 and php packages that fix two security issues are now
available for Red Hat Enterprise Linux 5 and 6 respectively.
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.
PHP is an HTML-embedded scripting language commonly used with the Apache
HTTP Server.
It was found that the hashing routine used by PHP arrays was susceptible
to predictable hash collisions. If an HTTP POST request to a PHP
application contained many parameters whose names map to the same hash
value, a large amount of CPU time would be consumed. This flaw has been
mitigated by adding a new configuration directive, max_input_vars, that
limits the maximum number of parameters processed per request. By
default, max_input_vars is set to 1000. (CVE-2011-4885)
An integer overflow flaw was found in the PHP exif extension. On 32-bit
systems, a specially-crafted image file could cause the PHP interpreter to
crash or disclose portions of its memory when a PHP script tries to extract
Exchangeable image file format (Exif) metadata from the image file.
(CVE-2011-4566)
Red Hat would like to thank oCERT for reporting CVE-2011-4885. oCERT
acknowledges Julian Walde and Alexander Klink as the original reporters of
CVE-2011-4885.
All php53 and php users should upgrade to these updated packages, which
contain backported patches to resolve these issues. After installing the
updated packages, the httpd daemon must be restarted for the update to take
effect.
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
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