7.5 - RHSA-2007:0917

Problem Description:

Updated PHP packages that fix several security issues are now available for Red Hat Application Stack.

This update has been rated as having moderate security impact by the Red Hat Security Response Team.

2. Relevant releases/architectures:

Red Hat Application Stack v2 for Enterprise Linux (v.5) - i386, x86_64

3. Problem description:

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

These updated packages address the following vulnerabilities:

Various integer overflow flaws were found in the PHP gd extension. A script that could be forced to resize images from an untrusted source could possibly allow a remote attacker to execute arbitrary code as the apache user. (CVE-2007-3996)

A previous security update introduced a bug into PHP session cookie handling. This could allow an attacker to stop a victim from viewing a vulnerable web site if the victim has first visited a malicious web page under the control of the attacker, and that page can set a cookie for the vulnerable web site. (CVE-2007-4670)

A flaw was found in the PHP money_format function. If a remote attacker was able to pass arbitrary data to the money_format function this could possibly result in an information leak or denial of service. Note that is is unusual for a PHP script to pass user-supplied data to the money_format function. (CVE-2007-4658)

A flaw was found in the PHP wordwrap function. If a remote attacker was able to pass arbitrary data to the wordwrap function this could possibly result in a denial of service. (CVE-2007-3998)

A bug was found in PHP session cookie handling. This could allow an attacker to create a cross-site cookie insertion attack if a victim follows an untrusted carefully-crafted URL. (CVE-2007-3799)

A flaw was found in handling of dynamic changes to global variables. A script which used certain functions which change global variables could be forced to enable the register_globals configuration option, possibly resulting in global variable injection. (CVE-2007-4659)

An integer overflow flaw was found in the PHP chunk_split function. If a remote attacker was able to pass arbitrary data to the third argument of chunk_split they could possibly execute arbitrary code as the apache user. Note that it is unusual for a PHP script to use the chunk_split function with a user-supplied third argument. (CVE-2007-4661)

Users of PHP should upgrade to these updated packages which contain backported patches to correct these issues.

4. Solution:

Before applying this update, make sure all previously released errata relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade. Only those RPMs which are currently installed will be updated. Those RPMs which are not installed but included in the list will not be updated. Note that you can also use wildcards (*.rpm) if your current directory *only* contains the desired RPMs.

Please note that this update is also available via Red Hat Network. Many people find this an easier way to apply updates. To use Red Hat Network, launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate RPMs being upgraded on your system.

5. Bug IDs fixed (http://bugzilla.redhat.com/):

250726 - CVE-2007-3799 php cross-site cookie insertion 276081 - CVE-2007-3998 php floating point exception inside wordwrap 276531 - CVE-2007-4659 php zend_alter_ini_entry() memory_limit interruption 278011 - CVE-2007-4658 php money_format format string issue 278031 - CVE-2007-3996 php multiple integer overflows in gd 278041 - CVE-2007-4670 php malformed cookie handling 278161 - CVE-2007-4661 php size calculation in chunk_split