I don't know if this will be of much help, but here is an article that details how to get true "root" access to CUCM. Under the hood it's basically a RHEL/CentOS install.
http://www.uccollaborationgeek.com/root-access-cucm/
Skimming the article it is a bit involved, but maybe will lead you to the access you need to fix the SSH issue? shrugs
If I had to guess, I bet the same process will work for Unity as well.