Advisory Details

April 21st, 2021

Parallels Desktop Tools Integer Overflow Privilege Escalation Vulnerability

ZDI-21-432
ZDI-CAN-12790

CVE ID CVE-2021-31425
CVSS SCORE 8.8, (AV:L/AC:L/PR:L/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 low-privileged code on the target guest system in order to exploit this vulnerability.

The specific flaw exists within the Parallels Tools component. The issue results from the lack of proper validation of user-supplied data, which can result in an integer overflow before allocating a buffer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel on the target guest system.

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 grigoritchy
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