GLSA 200412-14: PHP: Multiple vulnerabilities

http://security.gentoo.org/

Severity:	high
Title:	PHP: Multiple vulnerabilities
Date:	12/19/2004
Bugs:	#74547
ID:	200412-14

Synopsis

Several vulnerabilities were found and fixed in PHP, ranging from an information leak and a safe_mode restriction bypass to a potential remote execution of arbitrary code.

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.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
dev-php/php	< 4.3.10	>= 4.3.10	All supported architectures
dev-php/mod_php	< 4.3.10	>= 4.3.10	All supported architectures
dev-php/php-cgi	< 4.3.10	>= 4.3.10	All supported architectures

Description

Stefan Esser and Marcus Boerger reported several different issues in the unserialize() function, including serious exploitable bugs in the way it handles negative references (CAN-2004-1019).

Stefan Esser also discovered that the pack() and unpack() functions are subject to integer overflows that can lead to a heap buffer overflow and a heap information leak. Finally, he found that the way multithreaded PHP handles safe_mode_exec_dir restrictions can be bypassed, and that various path truncation issues also allow to bypass path and safe_mode restrictions.

Ilia Alshanetsky found a stack overflow issue in the exif_read_data() function (CAN-2004-1065). Finally, Daniel Fabian found that addslashes and magic_quotes_gpc do not properly escape null characters and that magic_quotes_gpc contains a bug that could lead to one level directory traversal.

Impact

These issues could be exploited by a remote attacker to retrieve web server heap information, bypass safe_mode or path restrictions and potentially execute arbitrary code with the rights of the web server running a PHP application.

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-4.3.10"

All mod_php users should upgrade to the latest version:


    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-php/mod_php-4.3.10"

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


    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-php/php-cgi-4.3.10"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200412-14.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.