need to fix 4 high vulnerability assessments about needing to update zlib 1.2.8

[Thomas Gertin]

Hello,

I am getting 4 high vulnerability assessments from my Common
Vulnerabilities and Exposures-1.1 rules package. They all recommend
updating my zlib package. I have updated my zlib package and it is
up-to-date with version 1.2.8. However, it still produces the same
vulnerability assessments, and I think I may need to update it
further. I have Ubuntu 14.04.5 LTS. Can anybody help on how to do
this?

Thanks,

Tom