Advisory Details

July 20th, 2020

Oracle VirtualBox PCnet Out-Of-Bounds Access Privilege Escalation Vulnerability

ZDI-20-894
ZDI-CAN-10899

CVE ID CVE-2020-14676
CVSS SCORE 7.5, (AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H)
AFFECTED VENDORS Oracle
AFFECTED PRODUCTS VirtualBox
VULNERABILITY DETAILS

This vulnerability allows local attackers to escalate privileges on affected installations of Oracle VirtualBox. An attacker must first obtain the ability to execute high-privileged code on the target guest system in order to exploit this vulnerability.

The specific flaw exists within the handling of Transmit Message Descriptors in the implementation of PCnet virtual network interfaces. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an allocated buffer. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of the hypervisor.

ADDITIONAL DETAILS Oracle has issued an update to correct this vulnerability. More details can be found at:
https://www.oracle.com/security-alerts/cpujul2020.html
DISCLOSURE TIMELINE
  • 2020-05-06 - Vulnerability reported to vendor
  • 2020-07-20 - Coordinated public release of advisory
CREDIT Reno Robert
BACK TO ADVISORIES