Advisory Details

August 18th, 2020

Parallels Desktop prl_hypervisor Exposed Dangerous Method Information Disclosure Vulnerability

ZDI-20-1009
ZDI-CAN-10518

CVE ID CVE-2020-17391
CVSS SCORE 6.5, (AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N)
AFFECTED VENDORS Parallels
AFFECTED PRODUCTS Desktop
VULNERABILITY DETAILS

This vulnerability allows local attackers to disclose information on affected installations of Parallels Desktop. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the handler for HOST_IOCTL_INIT_HYPERVISOR in the prl_hypervisor kext. The issue results from the exposure of dangerous method or function to the unprivileged user. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the kernel.

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
  • 2020-04-01 - Vulnerability reported to vendor
  • 2020-08-18 - Coordinated public release of advisory
  • 2021-03-02 - Advisory Updated
CREDIT Reno Robert of Trend Micro Zero Day Initiative
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