Is Mail-in-a-box vulnerable?
Ubuntu 14.04 LTS is not vulnerable.
Just to add some clarity - That means that anyone that followed the setup instructions — installing on Ubuntu 14.04 — is not affected. Thanks @corv for looking into it.
wget https://webshare.uchicago.edu/orgs/ITServices/itsec/Downloads/GHOST.c -O /tmp/ghost-test.c && gcc /tmp/ghost-test.c -o /tmp/ghost-test && /tmp/ghost-test
Verifies the vulnerability or not.