/usr/lib/x86_64-linux-gnu/libcasn1.so is in libesnacc-dev 1.8.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libcasn1.so.0.800.1
/usr/lib/x86_64-linux-gnu/libcasn1.so.0.800.1