ping.php in Russcom.Ping allows remote attackers to execute arbitrary commands via shell metacharacters in the domain parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/26651
http://www.vupen.com/english/advisories/2006/1938
http://www.securityfocus.com/bid/18090
http://www.securityfocus.com/archive/1/434825/100/0/threaded