This update for libtcnative-1-0 to version 1.1.34 fixes the following issues:
CVE-2017-15698: Fixed an improper handling of fields with more than 127 bytes
which could allow invalid client certificates to be accepted (bsc#1078679).
CVE-2018-8019: When using an OCSP responder did not correctly handle invalid
responses. This allowed for revoked client certificates to be incorrectly
identified. It was therefore possible for users to authenticate with revoked
certificates when using mutual TLS (bsc#1103348).
CVE-2018-8020: Did not properly check OCSP pre-produced responses. Revoked
client certificates may have not been properly identified, allowing for users
to authenticate with revoked certificates to connections that require mutual
TLS (bsc#1103347).
For a complete list of changes please see
http://tomcat.apache.org/native-1.1-doc/miscellaneous/changelog.html