Advisory Details

April 21st, 2021

Parallels Desktop OTG Time-Of-Check Time-Of-Use Information Disclosure Vulnerability

ZDI-21-435
ZDI-CAN-13082

CVE ID CVE-2021-31427
CVSS SCORE 7.3, AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:L
AFFECTED VENDORS Parallels
AFFECTED PRODUCTS Desktop
VULNERABILITY DETAILS

This vulnerability allows local attackers to disclose sensitive information on affected installations of Parallels Desktop. 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 Open Tools Gate component. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this in conjunction with other vulnerabilities to escalate privileges and execute arbitrary code in the context of the hypervisor.

ADDITIONAL DETAILS Parallels has issued an update to correct this vulnerability. More details can be found at:
https://kb.parallels.com/en/125013
DISCLOSURE TIMELINE
  • 2021-02-08 - Vulnerability reported to vendor
  • 2021-04-21 - Coordinated public release of advisory
CREDIT Reno Robert of Trend Micro Zero Day Initiative
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