Hi Ori,
Is there a reason for having Guest Additions Version 4.1.12 in the VM instead of 4.2?
$ vagrant up (...) [default] VM booted and ready for use! [default] The guest additions on this VM do not match the installed version of VirtualBox! In most cases this is fine, but in rare cases it can cause things such as shared folders to not work properly. If you see shared folder errors, please update the guest additions within the virtual machine and reload your VM.
Guest Additions Version: 4.1.12 VirtualBox Version: 4.2 [default] Setting hostname... (...)
I will file a bug in Bugzilla if that is something you can fix.
Željko