Debian Stretch DSA-4594-1 Critical: OpenSSL 1.0 Overflow Fix

Guido Vranken discovered an overflow bug in the x64_64 Montgomery
squaring procedure used in exponentiation with 512-bit moduli.

For the oldstable distribution (stretch), this problem has been fixed
in version 1.0.2u-1~deb9u1.

We recommend that you upgrade your openssl1.0 packages.

For the detailed security status of openssl1.0 please refer to
its security tracker page at:

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/