PHP security update

Synopsis

PHP security update

Type/Severity

Security Advisory: Moderate

Topic

Updated PHP packages that fix various security issues are now available.

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 bug was found in the way PHP processes IFF and JPEG images. It is
possible to cause PHP to consume CPU resources for a short period of time
by supplying a carefully crafted IFF or JPEG image. The Common
Vulnerabilities and Exposures project (cve.mitre.org) has assigned the
names CAN-2005-0524 and CAN-2005-0525 to these issues.

A buffer overflow bug was also found in the way PHP processes EXIF image
headers. It is possible for an attacker to construct an image file in such
a way it could execute arbitrary instructions when processed by PHP. The
Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned
the name CAN-2005-1042 to this issue.

A denial of service bug was found in the way PHP processes EXIF image
headers. It is possible for an attacker to cause PHP to enter an infinite
loop for a short period of time by supplying a carefully crafted image file
to PHP for processing. The Common Vulnerabilities and Exposures project
(cve.mitre.org) has assigned the name CAN-2005-1043 to this issue.

Several bug fixes are also included in this update:

• some performance issues in the unserialize() function have been fixed
  
• the behaviour of the interpreter when handling integer overflow during
  conversion of a floating variable to an integer has been reverted to match
  the behaviour used upstream; the integer will now be wrapped rather than
  truncated
  
• a fix for the virtual() function in the Apache httpd module which would
  flush the response prematurely
  
• the hard-coded default "safe mode" setting is now "disabled" rather than
  "enabled"; to match the default /etc/php.ini setting
  
• in the curl extension, safe mode was not enforced for 'file:///' URL
  lookups (CAN-2004-1392).
  

Users of PHP should upgrade to these updated packages, which contain
backported fixes for these issues.

Solution

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied. Use Red Hat
Network to download and update your packages. To launch the Red Hat
Update Agent, use the following command:

up2date

For information on how to install packages manually, refer to the
following Web page for the System Administration or Customization
guide specific to your system:

http://www.redhat.com/docs/manuals/enterprise/

Affected Products

• Red Hat Enterprise Linux Server 4 x86_64
• Red Hat Enterprise Linux Server 4 ia64
• Red Hat Enterprise Linux Server 4 i386
• Red Hat Enterprise Linux Workstation 4 x86_64
• Red Hat Enterprise Linux Workstation 4 ia64
• Red Hat Enterprise Linux Workstation 4 i386
• Red Hat Enterprise Linux Desktop 4 x86_64
• Red Hat Enterprise Linux Desktop 4 i386
• Red Hat Enterprise Linux for IBM z Systems 4 s390x
• Red Hat Enterprise Linux for IBM z Systems 4 s390
• Red Hat Enterprise Linux for Power, big endian 4 ppc

Fixes

• BZ - 153108 - Error in configure prevents php SRPM rebuild on x86_64 w/ mssql module
• BZ - 153140 - CAN-2005-0524 PHP getimagesize() Multiple Denial of Service Vulnerabilities CAN-2005-0525
• BZ - 154021 - CAN-2005-1042 PHP exif buffer overflow
• BZ - 154025 - CAN-2005-1043 PHP exif infinite stack recursion

CVEs

• CVE-2004-1392
• CVE-2005-0524
• CVE-2005-0525
• CVE-2005-1042
• CVE-2005-1043

References

(none)