Argument injection vulnerability in Barracuda Spam Firewall running firmware 3.1.16 and 3.1.17 allows remote attackers to (1) read portions of source code via the -f option to Dig (dig_device.cgi), (2) determine file existence via the -r argument to Tcpdump (tcpdump_device.cgi) or (3) modify files in the cgi-bin directory via the -w argument to Tcpdump.