Directory traversal vulnerability in cgi-bin/preview_email.cgi in Barracuda Spam Firewall (BSF) 3.3.01.001 through 3.3.03.053 allows remote authenticated users to read arbitrary files via a .. (dot dot) in the file parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/28214
http://www.vupen.com/english/advisories/2006/3104
http://www.securityfocus.com/archive/1/441861/100/0/threaded