FreeBSD Security Advisory (FreeBSD-SA-11:07.chroot.asc)

The remote host is missing an update to the system as announced in the referenced advisory FreeBSD-SA-11:07.chroot.asc
Upgrade your system to the appropriate stable release or security branch dated after the correction date
Chroot is an operation that changes the apparent root directory for the current process and its children. The chroot(2) system call is widely used in many applications as a measure of limiting a process's access to the file system, as part of implementing privilege separation. The nsdispatch(3) API implementation has a feature to reload its configuration on demand. This feature may also load shared libraries and run code provided by the library when requested by the configuration file. The nsdispatch(3) API has no mechanism to alert it to whether it is operating within a chroot environment in which the standard paths for configuration files and shared libraries may be untrustworthy. The FreeBSD ftpd(8) daemon can be configured to use chroot(2), and also uses the nsdispatch(3) API.