PHP: Multiple vulnerabilities — GLSA 200504-15

Several vulnerabilities were found and fixed in PHP image handling functions, potentially resulting in Denial of Service conditions or the remote execution of arbitrary code.

Affected Packages

dev-php/php on all architectures
Affected versions < 4.3.11
Unaffected versions >= 4.3.11
dev-php/mod_php on all architectures
Affected versions < 4.3.11
Unaffected versions >= 4.3.11
dev-php/php-cgi on all architectures
Affected versions < 4.3.11
Unaffected versions >= 4.3.11

Background

PHP is a general-purpose scripting language widely used to develop web-based applications. It can run inside a web server using the mod_php module or the CGI version of PHP, or can run stand-alone in a CLI.

Description

An integer overflow and an unbound recursion were discovered in the processing of Image File Directory tags in PHP's EXIF module (CAN-2005-1042, CAN-2005-1043). Furthermore, two infinite loops have been discovered in the getimagesize() function when processing IFF or JPEG images (CAN-2005-0524, CAN-2005-0525).

Impact

A remote attacker could craft an image file with a malicious EXIF IFD tag, a large IFD nesting level or invalid size parameters and send it to a web application that would process this user-provided image using one of the affected functions. This could result in denying service on the attacked server and potentially executing arbitrary code with the rights of the web server.

Workaround

There is no known workaround at this time.

Resolution

All PHP users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=dev-php/php-4.3.11"

All mod_php users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=dev-php/mod_php-4.3.11"

All php-cgi users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=dev-php/php-cgi-4.3.11"

References

Release Date
April 18, 2005

Latest Revision
April 18, 2005: 01

Severity
high

Exploitable
remote

Bugzilla entries