virtualbox: security update

Two privilege escalation vulnerabilities in VirtualBox have
been fixed.
- CVE-2011-2300: CVSS v2 Base Score: 3.7
(AV:L/AC:H/Au:N/C:P/I:P/A:P)
- CVE-2011-2305: CVSS v2 Base Score: 6.2
(AV:L/AC:H/Au:N/C:C/I:C/A:C)

Fixed bugs
bnc#708271
VUL-0: two VirtualBox privilege escalations
Selected Binaries
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