The read_list_from_file function in vacation.pl for OpenWebmail before 2.32 20040629 allows remote attackers to execute arbitrary commands via shell metacharacters in a filename argument.
https://exchange.xforce.ibmcloud.com/vulnerabilities/16549
http://www.securityfocus.com/bid/10637
http://securitytracker.com/id?1010605
http://secunia.com/advisories/12017
http://openwebmail.org/openwebmail/download/cert/advisories/SA-04:04.txt