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TITLE:
PHP "array_user_key_compare()" Double DTOR Vulnerability

SECUNIA ADVISORY ID:
SA24542

VERIFY ADVISORY:
http://secunia.com/advisories/24542/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
PHP 5.2.x
http://secunia.com/product/13446/
PHP 4.4.x
http://secunia.com/product/5768/

DESCRIPTION:
Stefan Esser has reported a vulnerability in PHP, which can be
exploited by malicious users to gain escalated privileges.

The vulnerability is caused due to an error in the
"array_user_key_compare()" function where key references are
incorrectly destroyed. This can be exploited to cause memory
corruption and allow execution of arbitrary code, which can lead to
security restrictions, such as the "disable_functions" directive,
being bypassed.

The vulnerability is reported in version 4.4.6 and confirmed in
version 5.2.1. Other versions may also be affected.

SOLUTION:
Grant only trusted users permissions to execute PHP code.

PROVIDED AND/OR DISCOVERED BY:
Stefan Esser

ORIGINAL ADVISORY:
http://www.php-security.org/MOPB/MOPB-24-2007.html

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