Multiple SQL injection vulnerabilities in php-stats.recphp.php in PHP-Stats 0.1.9.1b and earlier allow remote attackers to execute arbitrary code via a leading dotted-quad IP address string in the (1) PC-REMOTE-ADDR HTTP header, which is inserted into $_SERVER['HTTP_PC_REMOTE_ADDR'], or (2) ip parameter.
https://www.exploit-db.com/exploits/3497
https://www.exploit-db.com/exploits/3496
https://exchange.xforce.ibmcloud.com/vulnerabilities/33031
http://www.vupen.com/english/advisories/2007/1004