Direct static code injection vulnerability in error.php in GuppY 4.5.9 and earlier, when register_globals is disabled, allows remote attackers to execute arbitrary PHP code via the _SERVER[REMOTE_ADDR] parameter, which is injected into a .inc script that is later included by the main script.
https://exchange.xforce.ibmcloud.com/vulnerabilities/23318
http://www.vupen.com/english/advisories/2005/2635
http://www.securityfocus.com/archive/1/417899/100/0/threaded