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TITLE:
PHP MSSQL Extension NTWDBLIB.DLL "dbopen" Buffer Overflow

SECUNIA ADVISORY ID:
SA24353

VERIFY ADVISORY:
http://secunia.com/advisories/24353/

CRITICAL:
Less critical

IMPACT:
Security Bypass

WHERE:
Local system

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

DESCRIPTION:
rgod has discovered a vulnerability in PHP's MSSQL Extension, which
can be exploited to bypass certain security restrictions.

The vulnerability is caused due to a boundary error when processing
arguments within the "dbopen()" function in NTWDBLIB.DLL located in
the PHP directory when the MSSQL 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
"mssql_connect()" or "mssql_pconnect()" functions and execute
arbitrary code therefore bypassing security restrictions like the
"disable_functions" directive.

Successful exploitation requires that the MSSQL 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 access to the affected system.

PROVIDED AND/OR DISCOVERED BY:
rgod

ORIGINAL ADVISORY:
http://retrogod.altervista.org/php_446_mssql_connect_bof.html

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
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Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
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use those supplied by the vendor.

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