The remote host is missing an update to the system as announced in the referenced advisory FreeBSD-SA-07:10.gtar.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-07:10.gtar.asc
GNU tar (gtar) is a utility to create and extract tape archives, commonly known as tar files. GNU tar is included in FreeBSD 5.x as /usr/bin/gtar. Insufficient sanity checking of paths containing '.' and '..' allows gtar to overwrite arbitrary files on the system.