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TITLE:
PHP4 ZVAL Reference Counter Overflow Vulnerability

SECUNIA ADVISORY ID:
SA24356

VERIFY ADVISORY:
http://secunia.com/advisories/24356/

CRITICAL:
Less critical

IMPACT:
Security Bypass

WHERE:
Local system

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

DESCRIPTION:
Stefan Esser has discovered a vulnerability in PHP4, which can be
exploited by malicious, local users to bypass certain security
restrictions.

The vulnerability is caused due to an integer overflow in the
handling of ZVAL structures. This can be exploited to corrupt memory
and execute arbitrary code therefore bypassing security restrictions
like the "disable_functions" directive.

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

SOLUTION:
Grant only trusted users access to affected systems.

PROVIDED AND/OR DISCOVERED BY:
Stefan Esser

ORIGINAL ADVISORY:
http://www.php-security.org/MOPB/MOPB-01-2007.html

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