RHSA-2011:0196 - Security Advisory

Topic

Updated php53 packages that fix three 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.

Description

PHP is an HTML-embedded scripting language commonly used with the Apache
HTTP Server.

A flaw was found in the way PHP converted certain floating point values
from string representation to a number. If a PHP script evaluated an
attacker's input in a numeric context, the PHP interpreter could cause high
CPU usage until the script execution time limit is reached. This issue only
affected i386 systems. (CVE-2010-4645)

A stack memory exhaustion flaw was found in the way the PHP filter_var()
function validated email addresses. An attacker could use this flaw to
crash the PHP interpreter by providing excessively long input to be
validated as an email address. (CVE-2010-3710)

A memory disclosure flaw was found in the PHP multi-byte string extension.
If the mb_strcut() function was called with a length argument exceeding the
input string size, the function could disclose a portion of the PHP
interpreter's memory. (CVE-2010-4156)

All php53 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.

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
http://kbase.redhat.com/faq/docs/DOC-11259

Affected Products

• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux Server 5 ia64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.6 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.6 ia64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.6 i386
• Red Hat Enterprise Linux Server - AUS 5.6 x86_64
• Red Hat Enterprise Linux Server - AUS 5.6 ia64
• Red Hat Enterprise Linux Server - AUS 5.6 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux for IBM z Systems 5 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 5.6 s390x
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 5.6 ppc
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 5.6 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 5.6 i386

Fixes

• BZ - 646684 - CVE-2010-3710 php: DoS in filter_var() via long email string
• BZ - 651682 - CVE-2010-4156 php information disclosure via mb_strcut()
• BZ - 667806 - CVE-2010-4645 php: hang on numeric value 2.2250738585072011e-308 with x87 fpu

CVEs

• CVE-2010-4645
• CVE-2010-4156
• CVE-2010-3710

References

• https://access.redhat.com/security/updates/classification/#moderate