Screen locking issue

[Michael]

start Windows7 in VirtualBox
run a CPU consuming program in Windows7
wait until gnome-screensaver blanks the screen
wait a minute more
type some key
you now will get a little timeframe (up to a minute) with access to the machine without being asked for the password. after that timeframe gnome-screensaver again blanks the screen and askes for the password

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnome-screensaver 3.4.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Fri May 11 12:27:22 2012
GnomeSessionIdleInhibited: No
GnomeSessionInhibitors: None
GsettingsGnomeSession:
 org.gnome.desktop.session idle-delay uint32 180
 org.gnome.desktop.session session-name 'ubuntu'
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007.1)
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-screensaver
Symptom: security
Title: Screen locking issue
UpgradeStatus: Upgraded to precise on 2012-05-07 (3 days ago)
WindowManager: No value set for `/desktop/gnome/session/required_components/windowmanager'
XorgConf:
 Section "InputClass"
  Identifier "middle button emulation class"
  MatchIsPointer "on"
  Option "Emulate3Buttons" "on"
 EndSection

[Michael (mijobe)]

I have just managed to stop VirtualBox while gnome-screensaver was activ. Instead of stopping VirtualBox I also would have been able to format it's virtual drive. Thus I think this is a security issue ...