Advisory Details

September 14th, 2021

(0Day) Parallels Desktop virtio-net Memory Corruption Privilege Escalation Vulnerability

ZDI-21-1066
ZDI-CAN-13246

CVE ID
CVSS SCORE 8.2, (AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H)
AFFECTED VENDORS Parallels
AFFECTED PRODUCTS Desktop
VULNERABILITY DETAILS

This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop. 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 virtio-net virtual device. The issue results from the lack of proper validation of user-supplied data, which can result in a memory corruption condition. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the hypervisor.

ADDITIONAL DETAILS

This vulnerability is being disclosed publicly without a patch in accordance with the ZDI 120 day deadline.

03/24/21 – ZDI reported the vulnerability to the vendor
03/26/21 – The vendor acknowledged the report
08/20/21 – ZDI requested an update
08/27/21 – ZDI requested an update
08/27/21 – The vendor indicated a fix would be included in the next release
08/27/21 – ZDI requested an ETA for the next release and notified the vendor of the intention to publish the report as a 0-day advisory
09/07/21 – ZDI notified the vendor of the intention to publish the case as a 0-day advisory on 09/14/21

-- Mitigation:
Given the nature of the vulnerability the only salient mitigation strategy is to restrict interaction with the application.


DISCLOSURE TIMELINE
  • 2021-03-24 - Vulnerability reported to vendor
  • 2021-09-14 - Coordinated public release of advisory
CREDIT Jeonghoon Shin(@singi21a) of THEORI
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