There is no provision to disable medium strength SSL ciphers in Snap Creator 4.3 release, but Snap Creator 4.3.1 has disabled the usage of these ciphers(like DES & 3DES).
Also, Snap Creator 4.3.1 has disabled TLSv1 protocol by default. To support backward compatibility, user can enable it by setting ENABLE_SECURITY_PROTOCOL_TLS_V1 parameter to Y in snapcreator.properties and agent.properties file.
User can upgrade Snap Creator to 4.3.1 release to avoid this kind of vulnerabilities.