RHSA-2005:838 - Security Advisory

Topic

Updated PHP packages that fix multiple security issues are now available
for Red Hat Enterprise Linux 2.1

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

Description

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

A flaw was found in the way PHP registers global variables during a file
upload request. A remote attacker could submit a carefully crafted
multipart/form-data POST request that would overwrite the $GLOBALS array,
altering expected script behavior, and possibly leading to the execution of
arbitrary PHP commands. Note that this vulnerability only affects
installations which have register_globals enabled in the PHP configuration
file, which is not a default or recommended option. The Common
Vulnerabilities and Exposures project assigned the name CVE-2005-3390 to
this issue.

A flaw was found in the PHP parse_str() function. If a PHP script passes
only one argument to the parse_str() function, and the script can be forced
to abort execution during operation (for example due to the memory_limit
setting), the register_globals may be enabled even if it is disabled in the
PHP configuration file. This vulnerability only affects installations that
have PHP scripts using the parse_str function in this way. (CVE-2005-3389)

A Cross-Site Scripting flaw was found in the phpinfo() function. If a
victim can be tricked into following a malicious URL to a site with a page
displaying the phpinfo() output, it may be possible to inject javascript
or HTML content into the displayed page or steal data such as cookies.
This vulnerability only affects installations which allow users to view the
output of the phpinfo() function. As the phpinfo() function outputs a
large amount of information about the current state of PHP, it should only
be used during debugging or if protected by authentication. (CVE-2005-3388)

Additionally, a bug introduced in the updates to fix CVE-2004-1019 has been
corrected.

Users of PHP should upgrade to these updated packages, which contain
backported patches that resolve these issues.

Solution

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

This update is available via Red Hat Network. 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.

Affected Products

• Red Hat Enterprise Linux Server 2 ia64
• Red Hat Enterprise Linux Server 2 i386
• Red Hat Enterprise Linux Workstation 2 ia64
• Red Hat Enterprise Linux Workstation 2 i386

Fixes

• BZ - 150778 - issue in fix for CAN-2004-1019
• BZ - 172207 - CVE-2005-3390 PHP register globals arbitrary code execution
• BZ - 172209 - CVE-2005-3389 PHP parse_str can enable register_globals
• BZ - 172212 - CVE-2005-3388 PHP phpinfo() XSS attack

CVEs

• CVE-2005-3389
• CVE-2005-3390
• CVE-2005-3388

References

(none)