GE D60 Line Distance Relay security fixes

Security hardening of network services with encrypted tunnel leads to buffer overflow and remote code execution in D60 Line Distance Relay as reported in security advisory ICSA-18-046-02.


Issue reported to GE 26 Jul 2016, Fixed 12 Jan 2018.

Kudos Kirill Nesterov @k_v_nesterov and Alexander Tlypov @_Rigmar_

Much more.

Enjoy.