rssh 2.0.0 through 2.2.3 allows local users to bypass access restrictions and gain root privileges by using the rssh_chroot_helper command to chroot to an external directory.
rssh 2.2.2 and earlier does not properly restrict programs that can be run, which could allow remote authenticated users to bypass intended access restrictions and execute arbitrary programs via (1) rdist -P, (2) rsync, or (3) scp -S.