VirtualBox v4.3.28 is released. VirtualBox is a general-purpose full virtualizer for x86/x64 hardware. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software.

VirtualBox v4.3.28 Changelog:
VirtualBox 4.3.28 is a maintenance release. The following items were fixed and/or added since VirtualBox 4.3.26:
VMM: fixed a Guru Meditation when rebooting certain guests (for example Solaris doing fast reboot) by fixing the implementation for INIT IPI
VMM: added some information for diagnosing rare VERR_VMX_INVALID_VMXON_PTR Guru Meditations (VT-x only)
GUI: HID LEDs sync: prevent synchronization if VM window has no focus (Windows and Mac OS X hosts only)
GUI: fixed drag and drop moving the cursor between guest screens on certain hosts
3D: fixed a crash on restoring the VM state on X11 hosts (bug #12737)
3D: fixed a crash on Linux guest shutdown (bug #12772)
VRDP: fixed incompatibility with rdesktop 1.8.3
VRDP: fixed listening for IPv6 on some systems (bug #14038)
Storage: don't crash if creating an asynchronous I/O context fails (e.g. when starting many VMs) and show a proper error message
Floppy: several fixes
Audio: improved the behavior of the volume control for the HD audio device emulation
USB: increase the number of supported drivers from 3 to 5 (Windows hosts only)
PS/2 keyboard: synchronize the LED state on VM restore (Windows and Mac OS X hosts only)
NAT Network: when running multiple NAT networks with multiple VMs, only stop the respective services when stopping VMs (bug #14090)
NAT: don't kill UDP bindings on ICMP errors (bug #13475)
NAT: bandwidth limit now works properly with NAT (bug #11485)
BIOS: fixed the returned size value of the VBE 2.0 PMI function 0Ah (4.2.0 regression; bug #14096)
Guest Control: fixed parameter quoting in Windows guests (bug #13157)
Webcam passthrough improvements for Linux (V4L2) hosts to support more webcam models
API: don't fail starting a VM with VBOX_E_INVALID_OBJECT_STATE under certain conditions (bug #13617)
API: be more verbose on VBOX_E_INVALID_OBJECT_STATE if a medium is attached to a running VM (bug #13560)
API: fixed a bug which could result in losing certain screen resize events with multi-monitor guests
rdesktop-vrdp: fixed path to the keymaps (bug #12066)
rdesktop-vrdp: switch to version 1.8.3
Windows hosts: more hardening fixes (e.g. bugs #14051, #14052)
Linux hosts: another fix for activated SMAP on Linux 3.19 and newer (Broadwell and later; bug #13961)
Linux hosts: Linux 4.1 compile fix (bug #14081)
Solaris hosts: fixed using of VNIC templates with Crossbow based bridged networking to be compatible with vanity interface names
Mac OS X hosts: fixed crash during VM termination under rare circumstances
Windows Additions/WDDM: improved video memory utilization and allow more/bigger guest screens with large resolutions (including HiDPI)
X11 Additions: prevent flickering when updating mouse cursor
Solaris Additions: fixed incorrect usage of 'prtconf' while installing Guest Additions (Solaris 10 only)

Download: VirtualBox v4.3.28
Source: Here