Windows Additions: several bugfixes for the credential provider auto-logon module.
Solaris hosts: fixed autostart SMF script (bug #11720).
Windows hosts / guests: fixed setting and using a guest user’s process environment variables (relevant for Guest Control).
Linux hosts / guests: don’t warn in kernel log if memory allocation fails (bug #11171).
Mac OS X hosts: fixed issue when the application icon was frozen in the dock if the bridging interface was not connected to a network (bug #12241).
VBoxSVC: fix segmentation fault on Linux hosts if a very long path exists under /dev (bug #12760).
VBoxSVC: fixed a bug which could trigger a crash if a VM snapshot was restored the second time and the VM has associated bandwidth groups (bug #12569).
VBoxSVC: documented the handling of host power management events (see the manual for more information) and added an extradata item for configuring the handling of the battery-low event (bug #9925).
API: fixed guest misbehavior under certain conditions if a storage medium was attached or removed at VM runtime.
API: fix crashes in Java API clients using the XPCOM binding, happened with output parameters only (bug #11232).
3D support: several fixes, multiscreen fixes (e.g.
NAT: fixed crash and misbehaviour under some circumstances with ICMP packets having TTL=1.
NAT: transparent handling of host sleep/resume and network configuration changes if the dnsproxy is enabled or if the hostresolver is used (bug #12441).
AHCI: ejecting a CD/DVD medium failed under certain conditions.
GUI: make sure that a minimized guest (using mini toolbar in full screen / seamless mode) keeps the minimized state (bug #12199).
GUI: experimental HID LEDs synchronization for Windows hosts, see the manual for more information.
GUI: experimental HID LEDs synchronization for Windows and Mac OS X hosts: fixed keyboard re-synchronization if the feature is disabled (as done by default bug #12758).
The following items were fixed and/or added: Virtualbox 4.2.24 is a maintenance release. Here’s how to install or upgrade it in Ubuntu 13.10, Ubuntu 13.04, Ubuntu 12.10 and Ubuntu 12.04. The virtualbox 4.2 series gets a new updates.