Comment 2 for bug 197935

pjjw@flex:~$ apt-cache policy unrar
unrar:
  Installed: 3.10-1nexenta1
  Candidate: 3.10-1nexenta1
  Version table:
 *** 3.10-1nexenta1 0
        500 http://apt.nexenta.org elatte-stable/non-free Packages
        100 /var/lib/dpkg/status

it's in the nexentacp repo.