Oracle VirtualBox CRClientPointer Use-After-Free Privilege Escalation Vulnerability

2019-04-17T00:00:00
ID ZDI-19-377
Type zdi
Reporter Jason Matthyser (pleasew8t) of MWR Labs
Modified 2019-06-22T00:00:00

Description

This vulnerability allows local attackers to execute arbitrary code on vulnerable installations of Oracle VirtualBox. An attacker must first obtain the ability to execute low-privileged code on the target guest system in order to exploit this vulnerability. The specific flaw exists within the handling of the CRClientPointer pointer. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of the hypervisor.