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TITLE:
PHP Interbase Extension "isc_attach_database()" Buffer Overflow

SECUNIA ADVISORY ID:
SA24529

VERIFY ADVISORY:
http://secunia.com/advisories/24529/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

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

DESCRIPTION:
rgod has discovered a vulnerability in PHP's Interbase extension,
which can be exploited by malicious users to gain escalated
privileges.

The vulnerability is caused due to a boundary error when processing
arguments passed to "isc_attach_database()" in GDS32.DLL located in
the PHP directory when the Interbase extension is installed. This can
be exploited to cause a stack-based buffer overflow via an overly long
(greater than 260 bytes) string passed as argument to e.g. PHP's
"ibase_connect()" or "ibase_pconnect()" functions and execute
arbitrary code therefore bypassing security restrictions like the
"disable_functions" directive.

Successful exploitation requires that the Interbase extension is
installed.

The vulnerability is reported in PHP 4.4.6 and confirmed in the
PHP-5.2.1 win32 installer. Other versions may also be affected.

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

PROVIDED AND/OR DISCOVERED BY:
rgod

ORIGINAL ADVISORY:
http://milw0rm.com/exploits/3488

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