Like the other PHP bugs, this on is mentioned in 230556, but not explicitly
closed and documented in any errata that I can find.

-------------------------------------------------------------------

Buffer underflow in the PHP_FILTER_TRIM_DEFAULT macro in the filtering extension
(ext/filter) in PHP 5.2.0 allows context-dependent attackers to execute
arbitrary code by calling filter_var with certain modes such as
FILTER_VALIDATE_INT, which causes filter to write a null byte in whitespace that
precedes the buffer.

    * MISC:http://www.php-security.org/MOPB/MOPB-19-2007.html
    * MISC:http://www.php.net/releases/5_2_1.php
    * DEBIAN:DSA-1283
    * URL:http://www.debian.org/security/2007/dsa-1283
    * BID:22922
    * URL:http://www.securityfocus.com/bid/22922
    * SECUNIA:25062
    * URL:http://secunia.com/advisories/25062