The remote host is missing an update to the system as announced in the referenced advisory FreeBSD-SA-06:16.smbfs.asc

Upgrade your system to the appropriate stable release or security branch dated after the correction date https://secure1.securityspace.com/smysecure/catid.html?in=FreeBSD-SA-06:16.smbfs.asc

smbfs is a network file-system used to access file servers using the SMB/CIFS protocol. chroot(2) is system call designed to limit a process's access to a particular subset of a file-system. smbfs does not properly sanitize paths containing a backslash character in particular the directory name '..\' is interpreted as the parent directory by the SMB/CIFS server, but smbfs handles it in the same manner as any other directory.