PHP remote file inclusion vulnerability in upgrade.php in Coalescent Systems freePBX 2.1.3 allows remote attackers to execute arbitrary PHP code via a URL in the amp_conf[AMPWEBROOT] parameter.Referenceshttp://www.securityfocus.com/bid/20785https://www.exploit-db.com/exploits/2665https://exchange.xforce.ibmcloud.com/vulnerabilities/29879
