TRENDnet TEW-812DRU router allows remote authenticated users to execute arbitrary commands via shell metacharacters in the (1) wan network prefix to internet/ipv6.asp; (2) remote port to adm/management.asp; (3) pptp username (4) pptp password (5) ip (6) gateway (7) l2tp username or (8) l2tp password to internet/wan.asp; (9) NtpDstStart (10) NtpDstEnd or (11) NtpDstOffset to adm/time.asp; or (12) device url to adm/management.asp. NOTE: vectors 9 10 and 11 can be exploited by unauthenticated remote attackers by leveraging CVE-2013-3098.