Advisory Details

April 18th, 2018

Oracle VirtualBox crUnpackExtendLockArraysEXT Out-Of-Bounds Write Privilege Escalation Vulnerability

ZDI-18-304
ZDI-CAN-5157

CVE ID CVE-2018-2836
CVSS SCORE 6.9, (AV:L/AC:M/Au:N/C:C/I:C/A:C)
AFFECTED VENDORS Oracle
AFFECTED PRODUCTS VirtualBox
VULNERABILITY DETAILS


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 crUnpackExtendLockArraysEXT method. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated object. An attacker can leverage this vulnerability to escalate privileges and execute code under the context of the hypervisor.

VENDOR RESPONSE Oracle has issued an update to correct this vulnerability. More details can be found at:
http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
DISCLOSURE TIMELINE
  • 2018-01-26 - Vulnerability reported to vendor
  • 2018-04-18 - Coordinated public release of advisory
  • 2018-04-18 - Advisory Updated
CREDIT Vasily Vasiliev
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