Advisory Details

July 1st, 2022

Parallels Access Agent Time-Of-Check Time-Of-Use Local Privilege Escalation Vulnerability

ZDI-22-947
ZDI-CAN-16134

CVE ID CVE-2022-34899
CVSS SCORE 7.0, AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS Parallels
AFFECTED PRODUCTS Access
VULNERABILITY DETAILS

This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Access Agent. An attacker must first obtain the ability to execute low-privileged code on the target host system in order to exploit this vulnerability.

The specific flaw exists within the Parallels service. By creating a symbolic link, an attacker can abuse the service to execute a file. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of root.

ADDITIONAL DETAILS Parallels has issued an update to correct this vulnerability. More details can be found at:
https://kb.parallels.com/en/129010
DISCLOSURE TIMELINE
  • 2021-12-22 - Vulnerability reported to vendor
  • 2022-07-01 - Coordinated public release of advisory
CREDIT Reno Robert of Trend Micro Zero Day Initiative
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