Buffer overflows in (1) php_mime_split in PHP 4.1.0, 4.1.1, and 4.0.6 and earlier, and (2) php3_mime_split in PHP 3.0.x allows remote attackers to execute arbitrary code via a multipart/form-data HTTP POST request when file_uploads is enabled.

PHP 4.0.4pl1 and 4.0.5 in safe mode allows remote attackers to read and write files owned by the web server UID by uploading a PHP script that uses the error_log function to access the files.