CVE-2006-4023

The ip2long function in PHP 5.1.4 and earlier may incorrectly validate an
arbitrary string and return a valid network IP address, which allows remote
attackers to obtain network information and facilitate other attacks, as
demonstrated using SQL injection in the X-FORWARDED-FOR Header in index.php
in MiniBB 2.0. NOTE: it could be argued that the ip2long behavior
represents a risk for security-relevant issues in a way that is similar to
strcpy’s role in buffer overflows, in which case this would be a class of
implementation bugs that would require separate CVE items for each PHP
application that uses ip2long in a security-relevant manner.