Follow the instructions to update ssh on the latest version.
The process requires patching the current source, which is unfortunately not written anywhere in the open-ssh website.
Package Information
-Download (HTTP): http://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-7.5p1.tar.gz
Download MD5 sum: 652fdc7d8392f112bef11cacf7e69e23
Download size: 1.4 MB
Estimated disk space required: 37 MB (add 11 MB for tests)
Estimated build time: 0.4 SBU (running the tests takes 10+ minutes, irrespective of processor speed)
Additional Downloads
Required patch: http://www.linuxfromscratch.org/patches/blfs/svn/openssh-7.5p1-openssl-1.1.0-1.patch
wget http://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-7.5p1.tar.gz
wget http://www.linuxfromscratch.org/patches/blfs/svn/openssh-7.5p1-openssl-1.1.0-1.patch
tar -xzvf openssh-7.5p1.tar.gz
cd openssh-7.5p1
patch -Np1 -i ../openssh-7.5p1-openssl-1.1.0-1.patch &&
./configure --prefix=/usr \
--sysconfdir=/etc/ssh \
--with-md5-passwords \
--with-privsep-path=/var/lib/sshd &&
make && make install