Vigil@nce - Oracle VM VirtualBox: escape to host file system via shared folders
June 2017 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
An attacker in a gest system can attempts many parallel access to
shared folders in Oracle VM VirtualBox, in order to get access to
the whole Linux host filesystem.
Impacted products: openSUSE Leap, VirtualBox.
Severity: 2/4.
Creation date: 18/04/2017.
DESCRIPTION OF THE VULNERABILITY
The Oracle VM VirtualBox product allows to share folders between
the host and guest systems.
However, in the case of a Linux host, an error in the
synchronization of guest access to shared folders allows the guest
system to open a file the real location of which is not in the
configured shared subtree.
An attacker in a gest system can therefore attempts many parallel
access to shared folders in Oracle VM VirtualBox, in order to get
access to the whole Linux host filesystem.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN